Replaced health checker with Prometheus metrics service.

base-config.yaml

@@ -1,4 +1,4 @@
-# Health check endpoint URL.
-# If configured, a GET request will be sent to this URL after each successful update cycle.
-# Leave empty to disable health check reporting.
-health_check_endpoint: ""
+# Prometheus metrics endpoint.
+# When enabled, a /metrics endpoint is exposed via the maubot webapp.
+# Disabled by default.
+metrics_enabled: false

maubot.yaml

@@ -8,5 +8,8 @@ main_class: OwncastSentry
 database: true
 database_type: asyncpg
 config: true
+webapp: true
+dependencies:
+  - prometheus_client>=0.24.1
 extra_files:
   - base-config.yaml

owncastsentry/__init__.py

@@ -16,13 +16,15 @@
 
 from typing import TYPE_CHECKING
 
+from aiohttp import web
 from maubot import MessageEvent, Plugin  # type: ignore[attr-defined]
 from maubot.handlers import command
+from prometheus_client.exposition import choose_encoder
 
 from .commands import CommandHandler
 from .config import Config
 from .database import StreamRepository, SubscriptionRepository
-from .health_checker import HealthChecker
+from .metrics import ErrorSource, MetricsService
 from .migrations import get_upgrade_table
 from .notification_service import NotificationService
 from .owncast_client import OwncastClient
@@ -57,8 +59,21 @@ class OwncastSentry(Plugin):
         config.load_and_update()
         db: Database = self.database  # type: ignore[assignment]
 
+        # Initialize metrics service and register web endpoint (if enabled)
+        self.metrics_service = MetricsService()
+        self.metrics_service.set_build_info(str(self.loader.meta.version))
+        if config.metrics_enabled and self.webapp is not None:
+            self.webapp.add_route(
+                method="GET", path="/metrics", handler=self._metrics_endpoint
+            )
+
         # Initialize the Owncast API client
-        self.owncast_client = OwncastClient(self.log, str(self.loader.meta.version))
+        self.owncast_client = OwncastClient(
+            self.log, str(self.loader.meta.version), metrics=self.metrics_service
+        )
+        self.metrics_service.register_open_connections_gauge(
+            lambda: self.owncast_client.open_connection_count
+        )
 
         # Initialize repositories
         self.stream_repo = StreamRepository(db)
@@ -66,7 +81,10 @@ class OwncastSentry(Plugin):
 
         # Initialize notification service
         self.notification_service = NotificationService(
-            self.client, self.subscription_repo, self.log
+            self.client,
+            self.subscription_repo,
+            self.log,
+            metrics=self.metrics_service,
         )
 
         # Initialize stream monitor
@@ -76,13 +94,7 @@ class OwncastSentry(Plugin):
             self.subscription_repo,
             self.notification_service,
             self.log,
-        )
-
-        # Initialize health checker
-        self.health_checker = HealthChecker(
-            db,
-            self.owncast_client,
-            self.log,
+            metrics=self.metrics_service,
         )
 
         # Initialize command handler
@@ -97,41 +109,69 @@ class OwncastSentry(Plugin):
         self.sched.run_periodically(60, self._update_all_stream_states)
 
     async def _update_all_stream_states(self) -> None:
-        """Update all stream states and perform health check."""
-        # Get list of all stream domains with active subscriptions
-        subscribed_domains = await self.subscription_repo.get_all_subscribed_domains()
+        """Update all stream states."""
+        try:
+            # Get list of all stream domains with active subscriptions
+            subscribed_domains = (
+                await self.subscription_repo.get_all_subscribed_domains()
+            )
 
-        # Delegate to stream monitor and get results
-        update_result = await self.stream_monitor.update_all_streams(subscribed_domains)
-
-        # Perform health check
-        config: Config = self.config  # type: ignore[assignment]
-        await self.health_checker.perform_health_check(
-            update_result,
-            config.health_check_endpoint,
-        )
+            # Delegate to stream monitor
+            await self.stream_monitor.update_all_streams(subscribed_domains)
+        except Exception:
+            self.metrics_service.record_error(ErrorSource.SCHEDULER_LOOP)
+            self.log.exception("Unhandled exception in scheduler loop.")
 
     @command.new(help="Subscribes to a new Owncast stream.")
     @command.argument("url")
     async def subscribe(self, evt: MessageEvent, url: str) -> None:
         """Delegate subscribe command to CommandHandler."""
-        await self.command_handler.subscribe(evt, url)
+        try:
+            await self.command_handler.subscribe(evt, url)
+        except Exception:
+            self.metrics_service.record_error(ErrorSource.COMMAND)
+            self.log.exception("Unhandled exception in subscribe command.")
+            await evt.reply("An unexpected error occurred. Please try again later.")
 
     @command.new(help="Unsubscribes from an Owncast stream.")
     @command.argument("url")
     async def unsubscribe(self, evt: MessageEvent, url: str) -> None:
         """Delegate unsubscribe command to CommandHandler."""
-        await self.command_handler.unsubscribe(evt, url)
+        try:
+            await self.command_handler.unsubscribe(evt, url)
+        except Exception:
+            self.metrics_service.record_error(ErrorSource.COMMAND)
+            self.log.exception("Unhandled exception in unsubscribe command.")
+            await evt.reply("An unexpected error occurred. Please try again later.")
 
     @command.new(help="Lists all stream subscriptions in this room.")
     async def subscriptions(self, evt: MessageEvent) -> None:
         """Delegate subscriptions command to CommandHandler."""
-        await self.command_handler.subscriptions(evt)
+        try:
+            await self.command_handler.subscriptions(evt)
+        except Exception:
+            self.metrics_service.record_error(ErrorSource.COMMAND)
+            self.log.exception("Unhandled exception in subscriptions command.")
+            await evt.reply("An unexpected error occurred. Please try again later.")
 
     @command.new(help="Lists currently live streams in this room.")
     async def live(self, evt: MessageEvent) -> None:
         """Delegate live command to CommandHandler."""
-        await self.command_handler.live(evt)
+        try:
+            await self.command_handler.live(evt)
+        except Exception:
+            self.metrics_service.record_error(ErrorSource.COMMAND)
+            self.log.exception("Unhandled exception in live command.")
+            await evt.reply("An unexpected error occurred. Please try again later.")
+
+    async def _metrics_endpoint(self, request: web.Request) -> web.Response:
+        """Serve Prometheus metrics."""
+        accept = request.headers.get("Accept", "")
+        encoder, content_type = choose_encoder(accept)
+        output = encoder(self.metrics_service.registry)
+        response = web.Response(body=output)
+        response.headers["Content-Type"] = content_type
+        return response
 
     async def stop(self) -> None:
         """Clean up resources by closing the HTTP session."""

owncastsentry/commands.py

@@ -83,9 +83,7 @@ class CommandHandler:
         except sqlite3.IntegrityError:
             # Room is already subscribed.
             await evt.reply(
-                "This room is already subscribed to notifications for "
-                + stream_domain
-                + "."
+                f"This room is already subscribed to notifications for {stream_domain}."
             )
             return
 
@@ -101,9 +99,8 @@ class CommandHandler:
         # All went well! Tell the user.
         self.log.info(f"[{stream_domain}] Subscription added for room {evt.room_id}.")
         await evt.reply(
-            "Subscription added! This room will receive notifications when "
-            + stream_domain
-            + " goes live."
+            f"Subscription added! This room will receive "
+            f"notifications when {stream_domain} goes live."
         )
 
     async def unsubscribe(self, evt: MessageEvent, url: str) -> None:
@@ -125,15 +122,14 @@ class CommandHandler:
                 f"[{stream_domain}] Subscription removed for room {evt.room_id}."
             )
             await evt.reply(
-                "Subscription removed! This room will no "
-                "longer receive notifications for " + stream_domain + "."
+                f"Subscription removed! This room will no "
+                f"longer receive notifications for {stream_domain}."
             )
         else:
             # No, nothing changed. Tell the user.
             await evt.reply(
-                "This room is already not subscribed to notifications for "
-                + stream_domain
-                + "."
+                "This room is already not subscribed to "
+                f"notifications for {stream_domain}."
             )
 
     def _format_duration(self, timestamp_str: str) -> str:
@@ -143,7 +139,7 @@ class CommandHandler:
         :return: Formatted duration string (e.g., "1 hour", "2 days").
         """
         try:
-            timestamp = datetime.fromisoformat(timestamp_str.replace("Z", "+00:00"))
+            timestamp = datetime.fromisoformat(timestamp_str)
             now = datetime.now(UTC)
             delta = now - timestamp
 
@@ -158,7 +154,7 @@ class CommandHandler:
                 return f"{hours} hour{'s' if hours != 1 else ''}"
             days = seconds // 86400
             return f"{days} day{'s' if days != 1 else ''}"
-        except Exception:
+        except ValueError:
             return "unknown duration"
 
     async def subscriptions(self, evt: MessageEvent) -> None:
@@ -183,7 +179,7 @@ class CommandHandler:
 
         # Build the response message body as Markdown
         count = len(subscribed_domains)
-        body_text = f"**Subscriptions for this room ({count}):**\n\n"
+        parts = [f"**Subscriptions for this room ({count}):**\n\n"]
 
         for domain in subscribed_domains:
             # Get the stream state from the database
@@ -192,45 +188,41 @@ class CommandHandler:
                 continue
 
             # Determine stream name (use domain as fallback)
-            stream_name = stream_state.name if stream_state.name else domain
+            stream_name = stream_state.name or domain
             safe_stream_name = sanitize_for_markdown(stream_name)
 
             # Start building this stream's entry with stream name as main bullet
-            body_text += f"- **{safe_stream_name}**  \n"
+            parts.append(f"- **{safe_stream_name}**  \n")
 
             # Add title if stream is online (as a sub-bullet)
             if stream_state.status == StreamStatus.ONLINE and stream_state.title:
                 safe_title = sanitize_for_markdown(stream_state.title)
-                body_text += f"  - Title: {safe_title}  \n"
+                parts.append(f"  - Title: {safe_title}  \n")
 
             # Determine status and duration (as a sub-bullet)
-            if stream_state.status == StreamStatus.ONLINE:
-                # Stream is online - use last_connect_time
-                if stream_state.last_connect_time:
+            match stream_state.status:
+                case StreamStatus.ONLINE if stream_state.last_connect_time:
                     duration = self._format_duration(stream_state.last_connect_time)
-                    body_text += f"  - Status: Online for {duration}  \n"
-            elif stream_state.status == StreamStatus.UNKNOWN:
-                # Stream status is unknown - instance unreachable
-                body_text += "  - Status: Unknown (instance unreachable)  \n"
-            else:
-                # Stream is offline - use last_disconnect_time
-                if stream_state.last_disconnect_time:
+                    parts.append(f"  - Status: Online for {duration}  \n")
+                case StreamStatus.UNKNOWN:
+                    parts.append("  - Status: Unknown (instance unreachable)  \n")
+                case StreamStatus.OFFLINE if stream_state.last_disconnect_time:
                     duration = self._format_duration(stream_state.last_disconnect_time)
-                    body_text += f"  - Status: Offline for {duration}  \n"
-                else:
-                    body_text += "  - Status: Offline  \n"
+                    parts.append(f"  - Status: Offline for {duration}  \n")
+                case StreamStatus.OFFLINE:
+                    parts.append("  - Status: Offline  \n")
 
             # Add stream link (as a sub-bullet)
-            body_text += f"  - Link: https://{domain}\n\n"
+            parts.append(f"  - Link: https://{domain}\n\n")
 
         # Add help text for unsubscribing
-        body_text += (
+        parts.append(
             "\nTo unsubscribe from any of these Owncast "
             "instances, use `!unsubscribe <domain>`"
         )
 
         # Send the response as Markdown
-        await evt.reply(body_text, markdown=True)
+        await evt.reply("".join(parts), markdown=True)
 
     async def live(self, evt: MessageEvent) -> None:
         """List currently live streams in the current room.
@@ -271,28 +263,28 @@ class CommandHandler:
 
         # Build the response message body as Markdown
         count = len(live_streams)
-        body_text = f"**Live Owncast instances ({count}):**\n\n"
+        parts = [f"**Live Owncast instances ({count}):**\n\n"]
 
         for domain, stream_state in live_streams:
             # Determine stream name (use domain as fallback)
-            stream_name = stream_state.name if stream_state.name else domain
+            stream_name = stream_state.name or domain
             safe_stream_name = sanitize_for_markdown(stream_name)
 
             # Start building this stream's entry with stream name as main bullet
-            body_text += f"- **{safe_stream_name}**  \n"
+            parts.append(f"- **{safe_stream_name}**  \n")
 
             # Add title (should be present for live streams)
             if stream_state.title:
                 safe_title = sanitize_for_markdown(stream_state.title)
-                body_text += f"  - Title: {safe_title}  \n"
+                parts.append(f"  - Title: {safe_title}  \n")
 
             # Add status with duration
             if stream_state.last_connect_time:
                 duration = self._format_duration(stream_state.last_connect_time)
-                body_text += f"  - Online for {duration}  \n"
+                parts.append(f"  - Online for {duration}  \n")
 
             # Add stream link
-            body_text += f"  - Link: https://{domain}\n\n"
+            parts.append(f"  - Link: https://{domain}\n\n")
 
         # Send the response as Markdown
-        await evt.reply(body_text.rstrip(), markdown=True)
+        await evt.reply("".join(parts).rstrip(), markdown=True)

owncastsentry/config.py

@@ -25,9 +25,9 @@ class Config(BaseProxyConfig):
 
         :param helper: ConfigUpdateHelper for copying values.
         """
-        helper.copy("health_check_endpoint")
+        helper.copy("metrics_enabled")
 
     @property
-    def health_check_endpoint(self) -> str:
-        """Return the configured health check endpoint URL."""
-        return self["health_check_endpoint"]  # type: ignore[no-any-return]
+    def metrics_enabled(self) -> bool:
+        """Return whether the Prometheus metrics endpoint is enabled."""
+        return self["metrics_enabled"]  # type: ignore[no-any-return]

owncastsentry/health_checker.py

@@ -1,163 +0,0 @@
-# Copyright 2026 Logan Fick
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""Health checking service for OwncastSentry."""
-
-from dataclasses import dataclass
-from typing import TYPE_CHECKING
-
-if TYPE_CHECKING:
-    import logging
-
-    from mautrix.util.async_db import Database
-
-    from .owncast_client import OwncastClient
-
-
-@dataclass
-class UpdateResult:
-    """Result of a stream update cycle."""
-
-    total_streams: int
-    successful_checks: int
-    failed_checks: int
-
-    @property
-    def http_healthy(self) -> bool:
-        """Determine HTTP health based on update results.
-
-        HTTP is considered healthy if:
-        - No streams are subscribed (nothing to check), OR
-        - At least one stream check succeeded
-
-        :return: True if HTTP is considered healthy.
-        """
-        if self.total_streams == 0:
-            return True
-        return self.successful_checks > 0
-
-
-@dataclass
-class HealthStatus:
-    """Represents the health status of the plugin."""
-
-    database_healthy: bool
-    http_healthy: bool
-
-    @property
-    def is_healthy(self) -> bool:
-        """Check if all health components are healthy.
-
-        :return: True if all checks pass.
-        """
-        return self.database_healthy and self.http_healthy
-
-
-class HealthChecker:
-    """Service for performing health checks on the plugin."""
-
-    def __init__(
-        self,
-        database: Database,
-        owncast_client: OwncastClient,
-        logger: logging.Logger,
-    ):
-        """Initialize the health checker.
-
-        :param database: The maubot database instance.
-        :param owncast_client: Client for making HTTP requests.
-        :param logger: Logger instance for debugging.
-        """
-        self.db = database
-        self.owncast_client = owncast_client
-        self.log = logger
-
-    async def check_database(self) -> bool:
-        """Check if the database is functioning by executing a simple query.
-
-        :return: True if database is healthy, False otherwise.
-        """
-        try:
-            async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-                await conn.fetchval("SELECT 1")
-            return True
-        except Exception as e:
-            self.log.warning(f"Database health check failed: {e}")
-            return False
-
-    async def perform_health_check(
-        self,
-        update_result: UpdateResult,
-        endpoint: str,
-    ) -> None:
-        """Perform health check and report to configured endpoint if all healthy.
-
-        :param update_result: Result of the stream update cycle.
-        :param endpoint: Health check endpoint URL (empty string to skip reporting).
-        """
-        # Check database health
-        database_healthy = await self.check_database()
-
-        # Evaluate HTTP health from update results
-        http_healthy = update_result.http_healthy
-
-        # Create health status
-        status = HealthStatus(
-            database_healthy=database_healthy,
-            http_healthy=http_healthy,
-        )
-
-        self.log.debug(
-            f"Health check: database={database_healthy}, http={http_healthy}, "
-            f"streams={update_result.total_streams}, "
-            f"succeeded={update_result.successful_checks}, "
-            f"failed={update_result.failed_checks}"
-        )
-
-        # Skip endpoint notification if not configured
-        if not endpoint or not endpoint.strip():
-            self.log.debug("Health check endpoint not configured, skipping report.")
-            return
-
-        # Only send to endpoint if ALL checks pass
-        if not status.is_healthy:
-            self.log.warning(
-                f"Health check failed, not reporting to endpoint. "
-                f"database={database_healthy}, http={http_healthy}"
-            )
-            return
-
-        # Send GET request to health endpoint
-        await self._send_health_report(endpoint)
-
-    async def _send_health_report(self, endpoint: str) -> None:
-        """Send a GET request to the health check endpoint.
-
-        :param endpoint: The endpoint URL.
-        """
-        try:
-            async with self.owncast_client.session.get(
-                endpoint, allow_redirects=True
-            ) as response:
-                if 200 <= response.status < 300:
-                    self.log.debug(
-                        f"Health check reported successfully (status={response.status})"
-                    )
-                else:
-                    self.log.warning(
-                        "Health check endpoint returned "
-                        f"non-success status: {response.status}"
-                    )
-        except Exception as e:
-            self.log.warning(f"Failed to report health check to endpoint: {e}")

owncastsentry/metrics.py

@@ -0,0 +1,234 @@
+# Copyright 2026 Logan Fick
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Prometheus metrics service for OwncastSentry."""
+
+import time
+from contextlib import contextmanager, suppress
+from enum import StrEnum
+from typing import TYPE_CHECKING
+
+from prometheus_client import CollectorRegistry, Counter, Gauge, Info
+
+from .models import StreamStatus
+
+
+class NotificationType(StrEnum):
+    """Notification type labels for the delivery counter."""
+
+    LIVE = "live"
+    TITLE_CHANGE = "title_change"
+    CLEANUP_WARNING = "cleanup_warning"
+    CLEANUP_DELETION = "cleanup_deletion"
+
+
+class ErrorSource(StrEnum):
+    """Error source labels for the error counter."""
+
+    SCHEDULER_LOOP = "scheduler_loop"
+    COMMAND = "command"
+
+
+if TYPE_CHECKING:
+    from collections.abc import Callable, Generator
+
+# Mapping from StreamStatus enum to numeric gauge values
+_STATUS_VALUES: dict[StreamStatus, float] = {
+    StreamStatus.ONLINE: 1.0,
+    StreamStatus.OFFLINE: 0.0,
+    StreamStatus.UNKNOWN: -1.0,
+}
+
+
+class _ResponseTimer:
+    """Timer that only records an observation when explicitly marked successful."""
+
+    __slots__ = ("_domain", "_gauge", "_should_observe", "_start")
+
+    def __init__(self, gauge: Gauge, domain: str) -> None:
+        self._gauge = gauge
+        self._domain = domain
+        self._start = time.monotonic()
+        self._should_observe = False
+
+    def success(self) -> None:
+        """Mark the request as successful so the duration is recorded."""
+        self._should_observe = True
+
+    def _finalize(self) -> None:
+        if self._should_observe:
+            self._gauge.labels(domain=self._domain).set(
+                max(time.monotonic() - self._start, 0)
+            )
+        else:
+            with suppress(KeyError):
+                self._gauge.remove(self._domain)
+
+
+class MetricsService:
+    """Manages Prometheus metrics with an isolated registry."""
+
+    def __init__(self) -> None:
+        """Initialize metrics with a custom collector registry."""
+        self.registry = CollectorRegistry()
+
+        self.notification_delivery_total = Counter(
+            "owncastsentry_notification_delivery_total",
+            "Total notification delivery attempts to individual rooms",
+            ["type", "result"],
+            registry=self.registry,
+        )
+        self.stream_status = Gauge(
+            "owncastsentry_stream_status",
+            "Current stream status (1=online, 0=offline, -1=unknown)",
+            ["domain"],
+            registry=self.registry,
+        )
+        self.stream_subscriptions = Gauge(
+            "owncastsentry_stream_subscriptions",
+            "Number of room subscriptions per stream domain",
+            ["domain"],
+            registry=self.registry,
+        )
+        self.check_failures = Gauge(
+            "owncastsentry_check_failures",
+            "Consecutive check failure count per stream domain",
+            ["domain"],
+            registry=self.registry,
+        )
+        self.api_response_seconds = Gauge(
+            "owncastsentry_api_response_seconds",
+            "Last successful HTTP response time in seconds per stream domain",
+            ["domain"],
+            registry=self.registry,
+        )
+        self.build_info = Info(
+            "owncastsentry",
+            "OwncastSentry build information",
+            registry=self.registry,
+        )
+        self.open_connections = Gauge(
+            "owncastsentry_http_connections_open",
+            "Total number of open HTTP connections (idle and active)",
+            registry=self.registry,
+        )
+        self.errors_total = Counter(
+            "owncastsentry_errors_total",
+            "Internal errors by source",
+            ["source"],
+            registry=self.registry,
+        )
+
+        # Initialize all known label combinations so they start at 0
+        for notification_type in NotificationType:
+            for result in ("success", "failure"):
+                self.notification_delivery_total.labels(
+                    type=notification_type, result=result
+                )
+        for source in ErrorSource:
+            self.errors_total.labels(source=source)
+
+    def record_delivery(
+        self,
+        notification_type: NotificationType,
+        *,
+        successful: int = 0,
+        failed: int = 0,
+    ) -> None:
+        """Record notification delivery results.
+
+        :param notification_type: The type of notification delivered.
+        :param successful: Number of successful room deliveries.
+        :param failed: Number of failed room deliveries.
+        """
+        self.notification_delivery_total.labels(
+            type=notification_type, result="success"
+        ).inc(successful)
+        self.notification_delivery_total.labels(
+            type=notification_type, result="failure"
+        ).inc(failed)
+
+    def set_stream_status(self, domain: str, status: StreamStatus) -> None:
+        """Set the status gauge for a stream domain.
+
+        :param domain: The stream domain.
+        :param status: The current stream status.
+        """
+        self.stream_status.labels(domain=domain).set(_STATUS_VALUES[status])
+
+    def set_check_failures(self, domain: str, count: int) -> None:
+        """Set the consecutive failure count for a stream domain.
+
+        :param domain: The stream domain.
+        :param count: The current failure counter value.
+        """
+        self.check_failures.labels(domain=domain).set(count)
+
+    def set_subscription_count(self, domain: str, count: int) -> None:
+        """Set the subscription count for a stream domain.
+
+        :param domain: The stream domain.
+        :param count: The number of room subscriptions.
+        """
+        self.stream_subscriptions.labels(domain=domain).set(count)
+
+    @contextmanager
+    def response_timer(self, domain: str) -> Generator[_ResponseTimer]:
+        """Return a context manager that times an HTTP request.
+
+        Call ``timer.success()`` inside the block to record the duration.
+        If ``success()`` is never called, nothing is recorded.
+
+        :param domain: The stream domain being queried.
+        """
+        timer = _ResponseTimer(self.api_response_seconds, domain)
+        try:
+            yield timer
+        finally:
+            timer._finalize()
+
+    def set_build_info(self, version: str) -> None:
+        """Set the build version info metric.
+
+        :param version: The plugin version string.
+        """
+        self.build_info.info({"version": version})
+
+    def register_open_connections_gauge(self, callback: Callable[[], float]) -> None:
+        """Register a gauge that reads open connection count on scrape.
+
+        :param callback: Function returning the current open count.
+        """
+        self.open_connections.set_function(callback)
+
+    def record_error(self, source: ErrorSource) -> None:
+        """Increment the internal error counter.
+
+        :param source: The source of the error.
+        """
+        self.errors_total.labels(source=source).inc()
+
+    def remove_stream(self, domain: str) -> None:
+        """Remove a stream's gauge labels after cleanup deletion.
+
+        :param domain: The stream domain to remove.
+        """
+        with suppress(KeyError):
+            self.stream_status.remove(domain)
+        with suppress(KeyError):
+            self.check_failures.remove(domain)
+        with suppress(KeyError):
+            self.stream_subscriptions.remove(domain)
+        with suppress(KeyError):
+            self.api_response_seconds.remove(domain)

owncastsentry/models.py

@@ -91,6 +91,15 @@ class StreamState:
         )
 
 
+@dataclass
+class UpdateResult:
+    """Result of a stream update cycle."""
+
+    total_streams: int
+    successful_checks: int
+    failed_checks: int
+
+
 @dataclass
 class StreamConfig:
     """Represents the configuration of an Owncast stream."""

owncastsentry/notification_service.py

@@ -20,9 +20,10 @@ from typing import TYPE_CHECKING, Any
 
 from mautrix.types import MessageType, TextMessageEventContent
 
+from .metrics import NotificationType
 from .utils import (
-    CLEANUP_DELETE_THRESHOLD,
-    CLEANUP_WARNING_THRESHOLD,
+    CLEANUP_DELETE_DAYS,
+    CLEANUP_WARNING_DAYS,
     SECONDS_BETWEEN_NOTIFICATIONS,
     sanitize_for_plain_text,
 )
@@ -31,6 +32,7 @@ if TYPE_CHECKING:
     import logging
 
     from .database import SubscriptionRepository
+    from .metrics import MetricsService
 
 
 class NotificationService:
@@ -41,16 +43,19 @@ class NotificationService:
         client: Any,
         subscription_repo: SubscriptionRepository,
         logger: logging.Logger,
+        metrics: MetricsService,
     ) -> None:
         """Initialize the notification service.
 
         :param client: The Matrix client for sending messages.
         :param subscription_repo: Repository for managing subscriptions.
         :param logger: Logger instance for debugging.
+        :param metrics: Metrics service for recording counters.
         """
         self.client = client
         self.subscription_repo = subscription_repo
         self.log = logger
+        self.metrics = metrics
 
         # Cache for tracking when notifications were last sent
         self.notification_timers_cache: dict[str, float] = {}
@@ -88,36 +93,24 @@ class NotificationService:
         # Record that we're sending a notification now
         self._record_notification(domain)
 
-        # Get a list of room IDs with active subscriptions to the stream domain
-        room_ids = await self.subscription_repo.get_subscribed_rooms(domain)
-
         # Build the notification message
         body_text = self._format_message(name, title, domain, tags, title_change)
 
-        # Set up counters for statistics
-        successful_notifications = 0
-        failed_notifications = 0
-
         # Send notifications to all subscribed rooms in parallel
-        tasks = [
-            self._send_notification(room_id, body_text, domain) for room_id in room_ids
-        ]
-
-        results = await asyncio.gather(*tasks, return_exceptions=True)
-
-        # Count successes and failures
-        for result in results:
-            if isinstance(result, Exception):
-                failed_notifications += 1
-            else:
-                successful_notifications += 1
+        successful, failed = await self._broadcast_to_rooms(domain, body_text)
 
         # Log completion
         notification_type = "title change" if title_change else "going live"
         self.log.info(
             f"[{domain}] Completed sending {notification_type} "
-            f"notifications! {successful_notifications} succeeded, "
-            f"{failed_notifications} failed."
+            f"notifications! {successful} succeeded, "
+            f"{failed} failed."
+        )
+
+        self.metrics.record_delivery(
+            NotificationType.TITLE_CHANGE if title_change else NotificationType.LIVE,
+            successful=successful,
+            failed=failed,
         )
 
     async def _send_notification(
@@ -153,36 +146,36 @@ class NotificationService:
         :return: Formatted message body.
         """
         # Use name if available, fallback to domain
-        stream_name = name if name else domain
+        stream_name = name or domain
         safe_stream_name = sanitize_for_plain_text(stream_name)
 
         # Choose message based on notification type
         if title_change:
-            body_text = "📝 " + safe_stream_name + " has changed its stream title!"
+            parts = [f"📝 {safe_stream_name} has changed its stream title!"]
         else:
-            body_text = "🎥 " + safe_stream_name + " is now live!"
+            parts = [f"🎥 {safe_stream_name} is now live!"]
 
         # Add title if present
-        if title != "":
+        if title:
             safe_title = sanitize_for_plain_text(title)
-            body_text += "\nStream Title: " + safe_title
+            parts.append(f"\nStream Title: {safe_title}")
 
         # Add stream URL
-        body_text += "\n\nTo tune in, visit: https://" + domain + "/"
+        parts.append(f"\n\nTo tune in, visit: https://{domain}/")
 
         # Add tags if present
         if tags:
-            safe_tags = []
-            for tag in tags:
-                safe_tag = sanitize_for_plain_text(tag)
-                if safe_tag and not safe_tag.startswith("."):
-                    safe_tags.append(safe_tag)
+            safe_tags = [
+                safe_tag
+                for tag in tags
+                if (safe_tag := sanitize_for_plain_text(tag))
+                and not safe_tag.startswith(".")
+            ]
 
             if safe_tags:
-                body_text += "\n\n"
-                body_text += " ".join("#" + tag for tag in safe_tags)
+                parts.append(f"\n\n{' '.join(f'#{tag}' for tag in safe_tags)}")
 
-        return body_text
+        return "".join(parts)
 
     def get_last_notification_time(self, domain: str) -> float:
         """Get the timestamp of the last notification sent for a domain.
@@ -201,84 +194,79 @@ class NotificationService:
         if domain not in self.notification_timers_cache:
             return True
 
-        seconds_since_last = round(time.time() - self.notification_timers_cache[domain])
-        return bool(seconds_since_last >= SECONDS_BETWEEN_NOTIFICATIONS)
+        seconds_since_last = round(
+            time.monotonic() - self.notification_timers_cache[domain]
+        )
+        return seconds_since_last >= SECONDS_BETWEEN_NOTIFICATIONS
 
     def _record_notification(self, domain: str) -> None:
         """Record that a notification was sent at the current time.
 
         :param domain: The stream domain.
         """
-        self.notification_timers_cache[domain] = time.time()
+        self.notification_timers_cache[domain] = time.monotonic()
+
+    async def _broadcast_to_rooms(self, domain: str, body_text: str) -> tuple[int, int]:
+        """Send a message to all rooms subscribed to a domain.
+
+        :param domain: The stream domain.
+        :param body_text: The message body text.
+        :return: Tuple of (successful, failed) counts.
+        """
+        room_ids = await self.subscription_repo.get_subscribed_rooms(domain)
+        tasks = [
+            self._send_notification(room_id, body_text, domain) for room_id in room_ids
+        ]
+        results = await asyncio.gather(*tasks, return_exceptions=True)
+        failed = sum(1 for r in results if isinstance(r, Exception))
+        successful = len(results) - failed
+        return successful, failed
 
     async def send_cleanup_warning(self, domain: str) -> None:
         """Send cleanup warning notification to all subscribed rooms.
 
         :param domain: The stream domain.
         """
-        # Get all subscribed rooms
-        room_ids = await self.subscription_repo.get_subscribed_rooms(domain)
-
-        # Build the warning message
-        warning_days = CLEANUP_WARNING_THRESHOLD // (24 * 60)
-        delete_days = CLEANUP_DELETE_THRESHOLD // (24 * 60)
-        remaining_days = delete_days - warning_days
+        remaining_days = CLEANUP_DELETE_DAYS - CLEANUP_WARNING_DAYS
         body_text = (
             "⚠️  Warning: Subscription Cleanup Scheduled\n\n"
             f"The Owncast instance at {domain} has been "
-            f"unreachable for {warning_days} days. If it remains "
+            f"unreachable for {CLEANUP_WARNING_DAYS} days. If it remains "
             f"unreachable for {remaining_days} more days "
-            f"({delete_days} days total), this subscription "
+            f"({CLEANUP_DELETE_DAYS} days total), this subscription "
             f"will be automatically removed."
         )
 
-        # Send to all rooms in parallel
-        tasks = [
-            self._send_notification(room_id, body_text, domain) for room_id in room_ids
-        ]
-
-        results = await asyncio.gather(*tasks, return_exceptions=True)
-
-        # Count successes and failures
-        successful = sum(1 for r in results if not isinstance(r, Exception))
-        failed = sum(1 for r in results if isinstance(r, Exception))
-
+        successful, failed = await self._broadcast_to_rooms(domain, body_text)
         self.log.info(
             f"[{domain}] Sent cleanup warning to {successful} rooms ({failed} failed)."
         )
 
+        self.metrics.record_delivery(
+            NotificationType.CLEANUP_WARNING, successful=successful, failed=failed
+        )
+
     async def send_cleanup_deletion(self, domain: str) -> None:
         """Send cleanup deletion notification to all subscribed rooms.
 
         :param domain: The stream domain.
         """
-        # Get all subscribed rooms
-        room_ids = await self.subscription_repo.get_subscribed_rooms(domain)
-
-        # Build the deletion message
-        delete_days = CLEANUP_DELETE_THRESHOLD // (24 * 60)
         body_text = (
             "🗑️  Subscription Automatically Removed\n\n"
             f"The Owncast instance at {domain} has been "
-            f"unreachable for {delete_days} days and has been "
+            f"unreachable for {CLEANUP_DELETE_DAYS} days and has been "
             f"automatically removed from subscriptions in this "
             f"room.\n\n"
             f"If the instance comes online again and you want to "
             f"resubscribe, run `!subscribe {domain}`."
         )
 
-        # Send to all rooms in parallel
-        tasks = [
-            self._send_notification(room_id, body_text, domain) for room_id in room_ids
-        ]
-
-        results = await asyncio.gather(*tasks, return_exceptions=True)
-
-        # Count successes and failures
-        successful = sum(1 for r in results if not isinstance(r, Exception))
-        failed = sum(1 for r in results if isinstance(r, Exception))
-
+        successful, failed = await self._broadcast_to_rooms(domain, body_text)
         self.log.info(
             f"[{domain}] Sent cleanup deletion notice to "
             f"{successful} rooms ({failed} failed)."
         )
+
+        self.metrics.record_delivery(
+            NotificationType.CLEANUP_DELETION, successful=successful, failed=failed
+        )

owncastsentry/owncast_client.py

@@ -14,28 +14,41 @@
 
 """HTTP client for querying Owncast instance APIs."""
 
-import json
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Any
 
 import aiohttp
 
+from .models import StreamConfig, StreamState
+from .utils import (
+    OWNCAST_CONFIG_PATH,
+    OWNCAST_STATUS_PATH,
+    REQUIRED_STATUS_FIELDS,
+    user_agent,
+)
+
 if TYPE_CHECKING:
     import logging
 
-from .models import StreamConfig, StreamState
-from .utils import OWNCAST_CONFIG_PATH, OWNCAST_STATUS_PATH, user_agent
+    from .metrics import MetricsService
 
 
 class OwncastClient:
     """HTTP client for communicating with Owncast instances."""
 
-    def __init__(self, logger: logging.Logger, version: str) -> None:
+    def __init__(
+        self,
+        logger: logging.Logger,
+        version: str,
+        metrics: MetricsService,
+    ) -> None:
         """Initialize the Owncast client with an HTTP session.
 
         :param logger: Logger instance for debugging
         :param version: Plugin version string for the User-Agent header
+        :param metrics: Metrics service for recording response times.
         """
         self.log = logger
+        self.metrics = metrics
 
         # Set up HTTP session configuration
         headers = {"User-Agent": user_agent(version)}
@@ -55,6 +68,37 @@ class OwncastClient:
             connector=connector,
         )
 
+    async def _fetch_json(self, domain: str, path: str) -> dict[str, Any] | None:
+        """Fetch and parse JSON from an Owncast API endpoint.
+
+        :param domain: The domain to query.
+        :param path: The API path to request.
+        :return: Parsed JSON response, or None on error.
+        """
+        url = f"https://{domain}{path}"
+        try:
+            async with self.session.get(url, allow_redirects=False) as response:
+                if response.status != 200:
+                    self.log.warning(
+                        f"[{domain}] Response to request on "
+                        f"{path} was not 200, "
+                        f"got {response.status} instead."
+                    )
+                    return None
+                try:
+                    result: dict[str, Any] = await response.json()
+                    return result
+                except (ValueError, aiohttp.ContentTypeError) as e:
+                    self.log.warning(
+                        f"[{domain}] Rejecting response to request on "
+                        f"{path} as could not be "
+                        f"interpreted as JSON: {e}"
+                    )
+                    return None
+        except (aiohttp.ClientError, TimeoutError, OSError) as e:
+            self.log.warning(f"[{domain}] Error making GET request to {path}: {e}")
+            return None
+
     async def get_stream_state(self, domain: str) -> StreamState | None:
         """Get the current stream state for a given domain.
 
@@ -65,55 +109,24 @@ class OwncastClient:
         :return: A StreamState if available, None on error.
         """
         self.log.debug(f"[{domain}] Fetching current stream state...")
-        status_url = "https://" + domain + OWNCAST_STATUS_PATH
+        with self.metrics.response_timer(domain) as timer:
+            new_state = await self._fetch_json(domain, OWNCAST_STATUS_PATH)
 
-        # Make a request to the endpoint
-        try:
-            async with self.session.request(
-                "GET", status_url, allow_redirects=False
-            ) as response:
-                # Check the response code is success
-                if response.status != 200:
-                    self.log.warning(
-                        f"[{domain}] Response to request on "
-                        f"{OWNCAST_STATUS_PATH} was not 200, "
-                        f"got {response.status} instead."
-                    )
-                    return None
+            if new_state is None:
+                return None
 
-                # Try to interpret the response as JSON
-                try:
-                    new_state = json.loads(await response.read())
-                except Exception as e:
-                    self.log.warning(
-                        f"[{domain}] Rejecting response to request on "
-                        f"{OWNCAST_STATUS_PATH} as could not be "
-                        f"interpreted as JSON: {e}"
-                    )
-                    return None
-        except Exception as e:
-            self.log.warning(
-                f"[{domain}] Error making GET request to {OWNCAST_STATUS_PATH}: {e}"
-            )
-            return None
-
-        # Validate the response contains all basic info needed
-        required_fields = [
-            "lastConnectTime",
-            "lastDisconnectTime",
-            "streamTitle",
-            "online",
-        ]
-        for field in required_fields:
-            if field not in new_state:
+            # Validate the response contains all basic info needed
+            missing = REQUIRED_STATUS_FIELDS - new_state.keys()
+            if missing:
                 self.log.warning(
-                    f"[{domain}] Rejecting response to request "
-                    f"on {OWNCAST_STATUS_PATH} as it does not "
-                    f"have {field} field."
+                    f"[{domain}] Rejecting response to request on "
+                    f"{OWNCAST_STATUS_PATH} as it is missing "
+                    f"fields: {', '.join(sorted(missing))}"
                 )
                 return None
 
-        return StreamState.from_api_response(new_state, domain)
+            timer.success()
+            return StreamState.from_api_response(new_state, domain)
 
     async def get_stream_config(self, domain: str) -> StreamConfig | None:
         """Get the current stream config for a given domain.
@@ -125,40 +138,13 @@ class OwncastClient:
         :return: A StreamConfig, or None if fetch failed.
         """
         self.log.debug(f"[{domain}] Fetching current stream config...")
-        config_url = "https://" + domain + OWNCAST_CONFIG_PATH
+        with self.metrics.response_timer(domain) as timer:
+            config = await self._fetch_json(domain, OWNCAST_CONFIG_PATH)
+            if config is None:
+                return None
 
-        # Make a request to the endpoint
-        try:
-            async with self.session.request(
-                "GET", config_url, allow_redirects=False
-            ) as response:
-                # Check the response code is success
-                if response.status != 200:
-                    self.log.warning(
-                        f"[{domain}] Response to request on "
-                        f"{OWNCAST_CONFIG_PATH} was not 200, "
-                        f"got {response.status} instead."
-                    )
-                    return None
-
-                # Try to interpret the response as JSON
-                try:
-                    config = json.loads(await response.read())
-                except Exception as e:
-                    self.log.warning(
-                        f"[{domain}] Rejecting response to request on "
-                        f"{OWNCAST_CONFIG_PATH} as could not be "
-                        f"interpreted as JSON: {e}"
-                    )
-                    return None
-        except Exception as e:
-            self.log.warning(
-                f"[{domain}] Error making GET request to {OWNCAST_CONFIG_PATH}: {e}"
-            )
-            return None
-
-        # Create StreamConfig from response (fields are truncated to max lengths)
-        return StreamConfig.from_api_response(config)
+            timer.success()
+            return StreamConfig.from_api_response(config)
 
     async def validate_instance(self, domain: str) -> bool:
         """Validate that a domain is a valid Owncast instance.
@@ -169,6 +155,16 @@ class OwncastClient:
         state = await self.get_stream_state(domain)
         return state is not None
 
+    @property
+    def open_connection_count(self) -> int:
+        """Return the total number of open HTTP connections."""
+        connector = self.session.connector
+        if connector is None:
+            return 0
+        idle = sum(len(conns) for conns in connector._conns.values())
+        active = len(connector._acquired)
+        return idle + active
+
     async def close(self) -> None:
         """Close the HTTP session."""
         await self.session.close()

owncastsentry/stream_monitor.py

@@ -18,8 +18,7 @@ import asyncio
 import time
 from typing import TYPE_CHECKING
 
-from .health_checker import UpdateResult
-from .models import StreamState
+from .models import StreamState, StreamStatus, UpdateResult
 from .utils import (
     CLEANUP_DELETE_THRESHOLD,
     CLEANUP_WARNING_THRESHOLD,
@@ -31,6 +30,7 @@ if TYPE_CHECKING:
     import logging
 
     from .database import StreamRepository, SubscriptionRepository
+    from .metrics import MetricsService
     from .notification_service import NotificationService
     from .owncast_client import OwncastClient
 
@@ -45,6 +45,7 @@ class StreamMonitor:
         subscription_repo: SubscriptionRepository,
         notification_service: NotificationService,
         logger: logging.Logger,
+        metrics: MetricsService,
     ) -> None:
         """Initialize the stream monitor.
 
@@ -53,12 +54,14 @@ class StreamMonitor:
         :param subscription_repo: Repository for subscription data.
         :param notification_service: Service for sending notifications.
         :param logger: Logger instance for debugging.
+        :param metrics: Metrics service for recording Prometheus metrics.
         """
         self.owncast_client = owncast_client
         self.stream_repo = stream_repo
         self.subscription_repo = subscription_repo
         self.notification_service = notification_service
         self.log = logger
+        self.metrics = metrics
 
         # Cache for tracking when streams last went offline
         self.offline_timer_cache: dict[str, float] = {}
@@ -77,23 +80,24 @@ class StreamMonitor:
         total_streams = len(subscribed_domains)
 
         # Build a list of async tasks for each stream domain
-        tasks = [
-            asyncio.create_task(self.update_stream(domain))
-            for domain in subscribed_domains
-        ]
-
-        # Run the tasks in parallel and collect results
-        results = await asyncio.gather(*tasks)
+        # Run all stream updates in parallel and collect results
+        results = await asyncio.gather(
+            *(self.update_stream(domain) for domain in subscribed_domains)
+        )
 
         # Count successes and failures
-        successful_checks = sum(1 for result in results if result is True)
-        failed_checks = sum(1 for result in results if result is False)
+        successful_checks = results.count(True)
+        failed_checks = results.count(False)
 
         self.log.debug(
             f"Update complete. {successful_checks}/{total_streams} succeeded, "
             f"{failed_checks} failed."
         )
 
+        for domain in subscribed_domains:
+            count = await self.subscription_repo.count_by_domain(domain)
+            self.metrics.set_subscription_count(domain, count)
+
         return UpdateResult(
             total_streams=total_streams,
             successful_checks=successful_checks,
@@ -127,6 +131,10 @@ class StreamMonitor:
             )
             # Check cleanup thresholds even when skipping query
             await self._check_cleanup_thresholds(domain, failure_counter + 1)
+            updated_state = await self.stream_repo.get_by_domain(domain)
+            if updated_state is not None:
+                self.metrics.set_stream_status(domain, updated_state.status)
+            self.metrics.set_check_failures(domain, failure_counter + 1)
             # Backoff is expected behavior, not a failure
             return True
 
@@ -152,15 +160,19 @@ class StreamMonitor:
             )
             # Check cleanup thresholds after connection failure
             await self._check_cleanup_thresholds(domain, failure_counter + 1)
+            updated_state = await self.stream_repo.get_by_domain(domain)
+            if updated_state is not None:
+                self.metrics.set_stream_status(domain, updated_state.status)
+            self.metrics.set_check_failures(domain, failure_counter + 1)
             # Actual connection failure
             return False
 
         # Fetch succeeded! Reset failure counter
         await self.stream_repo.reset_failure_counter(domain)
+        self.metrics.set_check_failures(domain, 0)
 
         # Initialize timer cache entries to prevent KeyError on first access
-        if domain not in self.offline_timer_cache:
-            self.offline_timer_cache[domain] = 0
+        self.offline_timer_cache.setdefault(domain, 0)
 
         # Does the last known stream state lack connect/disconnect?
         if (
@@ -184,7 +196,7 @@ class StreamMonitor:
 
             # Calculate seconds since the stream last went offline
             seconds_since_last_offline = round(
-                time.time() - self.offline_timer_cache[domain]
+                time.monotonic() - self.offline_timer_cache[domain]
             )
 
             # Have we queried this stream before?
@@ -278,7 +290,7 @@ class StreamMonitor:
         ):
             # Yep. This stream is now offline. Log it.
             update_database = True
-            self.offline_timer_cache[domain] = time.time()
+            self.offline_timer_cache[domain] = time.monotonic()
             self.log.info(f"[{domain}] Stream is now offline.")
 
         # Update the database with current stream state, if needed.
@@ -305,6 +317,10 @@ class StreamMonitor:
 
         # All done.
         self.log.debug(f"[{domain}] State update completed.")
+        if new_state.last_connect_time is not None:
+            self.metrics.set_stream_status(domain, StreamStatus.ONLINE)
+        else:
+            self.metrics.set_stream_status(domain, StreamStatus.OFFLINE)
         return True
 
     async def _check_cleanup_thresholds(self, domain: str, counter: int) -> None:
@@ -340,3 +356,4 @@ class StreamMonitor:
                 f"Deleted {deleted_count} subscriptions "
                 f"and stream record."
             )
+            self.metrics.remove_stream(domain)

owncastsentry/utils.py

@@ -23,6 +23,16 @@ OWNCAST_STATUS_PATH = "/api/status"
 # Path to GetWebConfig API call on Owncast instances
 OWNCAST_CONFIG_PATH = "/api/config"
 
+# Fields that must be present in an Owncast status API response
+REQUIRED_STATUS_FIELDS = frozenset(
+    {
+        "lastConnectTime",
+        "lastDisconnectTime",
+        "streamTitle",
+        "online",
+    }
+)
+
 
 def user_agent(version: str) -> str:
     """Build the User-Agent header string for HTTP requests.
@@ -50,9 +60,13 @@ SECONDS_BETWEEN_NOTIFICATIONS = 20 * 60  # 20 minutes in seconds
 #   online after, it's treated as regular going live.
 TEMPORARY_OFFLINE_NOTIFICATION_COOLDOWN = 7 * 60  # 7 min in seconds
 
-# Counter thresholds for auto-cleanup (60-second polling intervals)
-CLEANUP_WARNING_THRESHOLD = 83 * 24 * 60  # 119,520 cycles = 83 days
-CLEANUP_DELETE_THRESHOLD = 90 * 24 * 60  # 129,600 cycles = 90 days
+# Auto-cleanup timing (days of continuous unreachability)
+CLEANUP_WARNING_DAYS = 83
+CLEANUP_DELETE_DAYS = 90
+
+# Counter thresholds derived from days (60-second polling intervals)
+CLEANUP_WARNING_THRESHOLD = CLEANUP_WARNING_DAYS * 24 * 60
+CLEANUP_DELETE_THRESHOLD = CLEANUP_DELETE_DAYS * 24 * 60
 
 # Failure counter threshold for treating stream status as "unknown"
 UNKNOWN_STATUS_THRESHOLD = 15
@@ -109,7 +123,7 @@ def domainify(url: str) -> str:
 
     # Prepend // if no scheme so urlparse treats input as netloc
     if not url.startswith(("http://", "https://", "//")):
-        url = "//" + url
+        url = f"//{url}"
 
     parsed = urlparse(url)
     domain = (parsed.netloc or parsed.path).lower()
@@ -133,6 +147,9 @@ def truncate(text: str, max_length: int) -> str:
     return text[:max_length]
 
 
+_MARKDOWN_ESCAPE_TABLE = str.maketrans({c: f"\\{c}" for c in r"\*_[]()~`#+-=|{}.!<>&"})
+
+
 def escape_markdown(text: str) -> str:
     """Escape Markdown special characters to prevent injection attacks.
 
@@ -146,38 +163,7 @@ def escape_markdown(text: str) -> str:
     if not text:
         return text
 
-    # Escape Markdown special characters by prefixing with backslash
-    # Covers: formatting (*_~`), links ([]()), headings (#), lists (-+),
-    # blockquotes (>), code blocks (```), and other special characters
-    special_chars = {
-        "\\": "\\\\",  # Backslash must be first to avoid double-escaping
-        "*": "\\*",
-        "_": "\\_",
-        "[": "\\[",
-        "]": "\\]",
-        "(": "\\(",
-        ")": "\\)",
-        "~": "\\~",
-        "`": "\\`",
-        "#": "\\#",
-        "+": "\\+",
-        "-": "\\-",
-        "=": "\\=",
-        "|": "\\|",
-        "{": "\\{",
-        "}": "\\}",
-        ".": "\\.",
-        "!": "\\!",
-        "<": "\\<",
-        ">": "\\>",
-        "&": "\\&",
-    }
-
-    escaped_text = text
-    for char, replacement in special_chars.items():
-        escaped_text = escaped_text.replace(char, replacement)
-
-    return escaped_text
+    return text.translate(_MARKDOWN_ESCAPE_TABLE)
 
 
 def sanitize_for_plain_text(text: str) -> str:
@@ -216,11 +202,4 @@ def sanitize_for_markdown(text: str) -> str:
     if not text:
         return text
 
-    # Remove newlines and carriage returns to prevent multi-line injection
-    sanitized = text.replace("\n", " ").replace("\r", " ")
-
-    # Collapse multiple spaces into single space
-    sanitized = " ".join(sanitized.split())
-
-    # Escape Markdown special characters
-    return escape_markdown(sanitized)
+    return escape_markdown(sanitize_for_plain_text(text))

pyproject.toml

@@ -7,13 +7,13 @@ authors = [
 ]
 license = "Apache-2.0"
 requires-python = ">=3.14"
-dependencies = []
+dependencies = ["prometheus_client>=0.24.1"]
 
 [project.urls]
 Repository = "https://git.logal.dev/LogalDeveloper/OwncastSentry"
 
 [build-system]
-requires = ["hatchling>=1.28.0", "hatch-vcs>=0.5.0"]
+requires = ["hatchling>=1.29.0", "hatch-vcs>=0.5.0"]
 build-backend = "hatchling.build"
 
 [dependency-groups]
@@ -27,7 +27,7 @@ dev = [
     "pytest>=9.0.2",
     "pytest-asyncio>=1.3.0",
     "pytest-cov>=7.0.0",
-    "ruff>=0.15.5",
+    "ruff>=0.15.6",
     "time-machine>=3.2.0",
 ]
 

tests/conftest.py

@@ -14,13 +14,12 @@
 
 """Shared test fixtures and stubs for OwncastSentry tests."""
 
-from __future__ import annotations
-
 from dataclasses import dataclass, field
 from typing import TYPE_CHECKING, Any
 
 import pytest
 from mautrix.util.async_db import Database
+from prometheus_client import generate_latest
 
 from owncastsentry import OwncastSentry
 from owncastsentry.config import Config
@@ -31,9 +30,15 @@ if TYPE_CHECKING:
     from collections.abc import AsyncIterator
     from pathlib import Path
 
+    from owncastsentry.metrics import MetricsService
     from owncastsentry.models import StreamConfig, StreamState
 
 
+def generate_metrics_output(metrics: MetricsService) -> str:
+    """Generate Prometheus text format output from a MetricsService registry."""
+    return generate_latest(metrics.registry).decode("utf-8")
+
+
 @pytest.fixture
 async def database(tmp_path: Path) -> AsyncIterator[Database]:
     """Yield a real SQLite-backed mautrix Database with migrations applied."""

tests/test_commands.py

@@ -14,8 +14,6 @@
 
 """Tests for bot command handlers."""
 
-from __future__ import annotations
-
 import json
 import logging
 from datetime import UTC, datetime, timedelta

tests/test_database.py

@@ -14,8 +14,6 @@
 
 """Tests for database repository classes."""
 
-from __future__ import annotations
-
 from typing import TYPE_CHECKING
 
 if TYPE_CHECKING:

tests/test_health_checker.py

@@ -1,171 +0,0 @@
-# Copyright 2026 Logan Fick
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""Tests for the health checking service."""
-
-from __future__ import annotations
-
-import logging
-from typing import TYPE_CHECKING
-
-import pytest
-from aioresponses import aioresponses
-
-from owncastsentry.health_checker import HealthChecker, HealthStatus, UpdateResult
-from owncastsentry.owncast_client import OwncastClient
-
-if TYPE_CHECKING:
-    from collections.abc import AsyncIterator
-
-    from mautrix.util.async_db import Database
-
-
-@pytest.fixture
-async def health_checker(database: Database) -> AsyncIterator[HealthChecker]:
-    """Yield a HealthChecker backed by a real OwncastClient."""
-    client = OwncastClient(logger=logging.getLogger("test"), version="0.0.0")
-    yield HealthChecker(database, client, logging.getLogger("test"))
-    await client.close()
-
-
-class TestUpdateResultHttpHealthy:
-    """HTTP health derivation from update results."""
-
-    @pytest.mark.parametrize(
-        ("total", "successful", "failed", "expected"),
-        [
-            pytest.param(0, 0, 0, True, id="no-streams-is-healthy"),
-            pytest.param(3, 2, 1, True, id="some-successes-is-healthy"),
-            pytest.param(3, 0, 3, False, id="all-failures-is-unhealthy"),
-        ],
-    )
-    def test_http_healthy(
-        self, total: int, successful: int, failed: int, expected: bool
-    ) -> None:
-        """Derive HTTP health from stream check results."""
-        result = UpdateResult(
-            total_streams=total,
-            successful_checks=successful,
-            failed_checks=failed,
-        )
-        assert result.http_healthy is expected
-
-
-class TestHealthStatusIsHealthy:
-    """Overall health status derivation."""
-
-    @pytest.mark.parametrize(
-        ("db_healthy", "http_healthy", "expected"),
-        [
-            pytest.param(True, True, True, id="all-healthy"),
-            pytest.param(False, True, False, id="db-unhealthy"),
-            pytest.param(True, False, False, id="http-unhealthy"),
-            pytest.param(False, False, False, id="both-unhealthy"),
-        ],
-    )
-    def test_is_healthy(
-        self, db_healthy: bool, http_healthy: bool, expected: bool
-    ) -> None:
-        """Derive overall health from component health."""
-        status = HealthStatus(database_healthy=db_healthy, http_healthy=http_healthy)
-        assert status.is_healthy is expected
-
-
-class TestCheckDatabase:
-    """Database health check."""
-
-    async def test_returns_true_for_healthy_db(
-        self, health_checker: HealthChecker
-    ) -> None:
-        """Return True when the database responds to queries."""
-        assert await health_checker.check_database() is True
-
-    async def test_returns_false_for_stopped_db(
-        self, health_checker: HealthChecker, database: Database
-    ) -> None:
-        """Return False when the database connection is closed."""
-        await database.stop()
-        assert await health_checker.check_database() is False
-
-
-class TestPerformHealthCheck:
-    """Health check orchestration and endpoint reporting."""
-
-    async def test_skips_report_when_no_endpoint(
-        self, health_checker: HealthChecker
-    ) -> None:
-        """Skip reporting when endpoint is empty."""
-        result = UpdateResult(total_streams=0, successful_checks=0, failed_checks=0)
-        with aioresponses():
-            await health_checker.perform_health_check(result, "")
-
-    async def test_skips_report_when_unhealthy(
-        self, health_checker: HealthChecker
-    ) -> None:
-        """Skip health report when all stream checks failed."""
-        result = UpdateResult(total_streams=3, successful_checks=0, failed_checks=3)
-        with aioresponses():
-            await health_checker.perform_health_check(
-                result, "https://health.example.com/ping"
-            )
-
-    async def test_sends_report_when_healthy(
-        self, health_checker: HealthChecker
-    ) -> None:
-        """Send GET to endpoint when all checks pass."""
-        result = UpdateResult(total_streams=1, successful_checks=1, failed_checks=0)
-        with aioresponses() as mocked:
-            mocked.get("https://health.example.com/ping", status=200)
-            await health_checker.perform_health_check(
-                result, "https://health.example.com/ping"
-            )
-
-    async def test_skips_report_for_whitespace_endpoint(
-        self, health_checker: HealthChecker
-    ) -> None:
-        """Skip reporting when endpoint is whitespace."""
-        result = UpdateResult(total_streams=0, successful_checks=0, failed_checks=0)
-        with aioresponses():
-            await health_checker.perform_health_check(result, "   ")
-
-
-class TestSendHealthReport:
-    """Health report HTTP delivery."""
-
-    async def test_handles_success_response(
-        self, health_checker: HealthChecker
-    ) -> None:
-        """Complete without error on a 2xx response."""
-        with aioresponses() as mocked:
-            mocked.get("https://health.example.com/ping", status=200)
-            await health_checker._send_health_report("https://health.example.com/ping")
-
-    async def test_handles_non_success_response(
-        self, health_checker: HealthChecker
-    ) -> None:
-        """Complete without error on a non-2xx response."""
-        with aioresponses() as mocked:
-            mocked.get("https://health.example.com/ping", status=500)
-            await health_checker._send_health_report("https://health.example.com/ping")
-
-    async def test_handles_connection_error(
-        self, health_checker: HealthChecker
-    ) -> None:
-        """Complete without error on a connection failure."""
-        with aioresponses() as mocked:
-            mocked.get(
-                "https://health.example.com/ping",
-                exception=ConnectionError(),
-            )
-            await health_checker._send_health_report("https://health.example.com/ping")

tests/test_metrics.py

@@ -0,0 +1,314 @@
+# Copyright 2026 Logan Fick
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Tests for the Prometheus metrics service."""
+
+import pytest
+
+from owncastsentry.metrics import ErrorSource, MetricsService, NotificationType
+from owncastsentry.models import StreamStatus
+from tests.conftest import generate_metrics_output
+
+
+class TestRecordDelivery:
+    """Notification delivery counter with type and result labels."""
+
+    @pytest.mark.parametrize(
+        ("notification_type", "successful", "failed", "expected_fragments"),
+        [
+            pytest.param(
+                NotificationType.LIVE,
+                3,
+                0,
+                ['result="success",type="live"} 3.0'],
+                id="live-success",
+            ),
+            pytest.param(
+                NotificationType.LIVE,
+                0,
+                2,
+                ['result="failure",type="live"} 2.0'],
+                id="live-failure",
+            ),
+            pytest.param(
+                NotificationType.TITLE_CHANGE,
+                1,
+                0,
+                ['result="success",type="title_change"} 1.0'],
+                id="title-change-success",
+            ),
+            pytest.param(
+                NotificationType.CLEANUP_WARNING,
+                2,
+                0,
+                ['result="success",type="cleanup_warning"} 2.0'],
+                id="cleanup-warning-success",
+            ),
+            pytest.param(
+                NotificationType.CLEANUP_DELETION,
+                1,
+                1,
+                [
+                    'result="success",type="cleanup_deletion"} 1.0',
+                    'result="failure",type="cleanup_deletion"} 1.0',
+                ],
+                id="cleanup-deletion-mixed",
+            ),
+        ],
+    )
+    def test_records_delivery(
+        self,
+        notification_type: NotificationType,
+        successful: int,
+        failed: int,
+        expected_fragments: list[str],
+    ) -> None:
+        """Record delivery results with correct type and result labels."""
+        service = MetricsService()
+        service.record_delivery(notification_type, successful=successful, failed=failed)
+        output = generate_metrics_output(service)
+        for fragment in expected_fragments:
+            assert fragment in output
+
+    @pytest.mark.parametrize(
+        ("notification_type", "result"),
+        [
+            pytest.param(t, r, id=f"{t}-{r}")
+            for t in NotificationType
+            for r in ("success", "failure")
+        ],
+    )
+    def test_all_combinations_initialized(
+        self, notification_type: NotificationType, result: str
+    ) -> None:
+        """All type/result label combinations exist at zero on init."""
+        service = MetricsService()
+        output = generate_metrics_output(service)
+        expected = (
+            f"owncastsentry_notification_delivery_total"
+            f'{{result="{result}",type="{notification_type}"}} 0.0'
+        )
+        assert expected in output
+
+
+class TestSetStreamStatus:
+    """Per-stream status gauge."""
+
+    @pytest.mark.parametrize(
+        ("status", "expected_value"),
+        [
+            pytest.param(StreamStatus.ONLINE, 1.0, id="online"),
+            pytest.param(StreamStatus.OFFLINE, 0.0, id="offline"),
+            pytest.param(StreamStatus.UNKNOWN, -1.0, id="unknown"),
+        ],
+    )
+    def test_sets_status(self, status: StreamStatus, expected_value: float) -> None:
+        """Set gauge to the correct value for each stream status."""
+        service = MetricsService()
+        service.set_stream_status("test.com", status)
+        output = generate_metrics_output(service)
+        expected = f'owncastsentry_stream_status{{domain="test.com"}} {expected_value}'
+        assert expected in output
+
+
+class TestSetSubscriptionCount:
+    """Per-stream subscription count gauge."""
+
+    def test_sets_count(self) -> None:
+        """Set the subscription count for a domain."""
+        service = MetricsService()
+        service.set_subscription_count("test.com", 5)
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_stream_subscriptions{domain="test.com"} 5.0' in output
+
+    def test_updates_count(self) -> None:
+        """Update the subscription count for a domain."""
+        service = MetricsService()
+        service.set_subscription_count("test.com", 5)
+        service.set_subscription_count("test.com", 3)
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_stream_subscriptions{domain="test.com"} 3.0' in output
+
+
+class TestSetCheckFailures:
+    """Check failure counter gauge per domain."""
+
+    def test_sets_count(self) -> None:
+        """Set the failure count for a domain."""
+        service = MetricsService()
+        service.set_check_failures("fail.com", 3)
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_check_failures{domain="fail.com"} 3.0' in output
+
+    def test_resets_to_zero(self) -> None:
+        """Reset the failure count to zero."""
+        service = MetricsService()
+        service.set_check_failures("fail.com", 5)
+        service.set_check_failures("fail.com", 0)
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_check_failures{domain="fail.com"} 0.0' in output
+
+
+class TestResponseTimer:
+    """Response time gauge via context manager."""
+
+    def test_records_on_success(self) -> None:
+        """Record a response time when success() is called."""
+        service = MetricsService()
+        with service.response_timer("example.com") as timer:
+            timer.success()
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_api_response_seconds{domain="example.com"}' in output
+
+    def test_does_not_record_without_success(self) -> None:
+        """Do not record when success() is never called."""
+        service = MetricsService()
+        with service.response_timer("example.com"):
+            pass
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_api_response_seconds{domain="example.com"}' not in output
+
+    def test_overwrites_previous_value(self) -> None:
+        """Overwrite previous value with the latest response time."""
+        service = MetricsService()
+        with service.response_timer("example.com") as timer:
+            timer.success()
+        with service.response_timer("example.com") as timer:
+            timer.success()
+        output = generate_metrics_output(service)
+        # Gauge should have exactly one line for this domain, not accumulated
+        matches = [
+            line
+            for line in output.splitlines()
+            if line.startswith("owncastsentry_api_response_seconds{")
+        ]
+        assert len(matches) == 1
+
+    def test_does_not_record_on_exception(self) -> None:
+        """Do not record when the block raises an exception."""
+        service = MetricsService()
+        with (
+            pytest.raises(ValueError, match="boom"),
+            service.response_timer("example.com"),
+        ):
+            raise ValueError("boom")
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_api_response_seconds{domain="example.com"}' not in output
+
+
+class TestRemoveStream:
+    """Stale stream label cleanup."""
+
+    def test_removes_stream_label(self) -> None:
+        """Remove a stream's gauge labels after cleanup deletion."""
+        service = MetricsService()
+        service.set_stream_status("gone.com", StreamStatus.OFFLINE)
+        service.set_subscription_count("gone.com", 2)
+        assert 'domain="gone.com"' in generate_metrics_output(service)
+        service.remove_stream("gone.com")
+        assert 'domain="gone.com"' not in generate_metrics_output(service)
+
+    def test_remove_nonexistent_is_noop(self) -> None:
+        """Removing a nonexistent stream does not raise."""
+        service = MetricsService()
+        service.remove_stream("never.com")
+
+
+class TestRegisterOpenConnectionsGauge:
+    """Callback-based open connection gauge."""
+
+    def test_reads_value_from_callback(self) -> None:
+        """Read the open connection count from the callback at scrape time."""
+        service = MetricsService()
+        counter = [3]
+        service.register_open_connections_gauge(lambda: counter[0])
+        output = generate_metrics_output(service)
+        assert "owncastsentry_http_connections_open 3.0" in output
+
+    def test_reflects_updated_value(self) -> None:
+        """Reflect changes in the callback value on subsequent scrapes."""
+        service = MetricsService()
+        counter = [1]
+        service.register_open_connections_gauge(lambda: counter[0])
+        counter[0] = 5
+        output = generate_metrics_output(service)
+        assert "owncastsentry_http_connections_open 5.0" in output
+
+
+class TestSetBuildInfo:
+    """Build version info metric."""
+
+    def test_sets_version(self) -> None:
+        """Set the build version info."""
+        service = MetricsService()
+        service.set_build_info("1.2.3")
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_info{version="1.2.3"} 1.0' in output
+
+
+class TestRecordError:
+    """Internal error counter."""
+
+    def test_increments_counter(self) -> None:
+        """Increment the error counter for a source."""
+        service = MetricsService()
+        service.record_error(ErrorSource.SCHEDULER_LOOP)
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_errors_total{source="scheduler_loop"} 1.0' in output
+
+    def test_increments_multiple_sources(self) -> None:
+        """Increment error counters for different sources independently."""
+        service = MetricsService()
+        service.record_error(ErrorSource.SCHEDULER_LOOP)
+        service.record_error(ErrorSource.COMMAND)
+        service.record_error(ErrorSource.COMMAND)
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_errors_total{source="scheduler_loop"} 1.0' in output
+        assert 'owncastsentry_errors_total{source="command"} 2.0' in output
+
+    @pytest.mark.parametrize(
+        "source",
+        [pytest.param(s, id=s) for s in ErrorSource],
+    )
+    def test_all_sources_initialized(self, source: ErrorSource) -> None:
+        """All known source labels exist at zero on init."""
+        service = MetricsService()
+        output = generate_metrics_output(service)
+        expected = f'owncastsentry_errors_total{{source="{source}"}} 0.0'
+        assert expected in output
+
+
+class TestRegistryOutput:
+    """Prometheus registry output."""
+
+    def test_returns_string(self) -> None:
+        """Return a string (not bytes)."""
+        service = MetricsService()
+        output = generate_metrics_output(service)
+        assert isinstance(output, str)
+
+    def test_contains_help_lines(self) -> None:
+        """Include HELP lines for registered metrics."""
+        service = MetricsService()
+        output = generate_metrics_output(service)
+        assert "# HELP owncastsentry_notification_delivery_total" in output
+        assert "# HELP owncastsentry_errors_total" in output
+        assert "# HELP owncastsentry_info" in output
+
+    def test_uses_isolated_registry(self) -> None:
+        """Use a custom registry, not the global default."""
+        service = MetricsService()
+        output = generate_metrics_output(service)
+        assert "python_gc" not in output
+        assert "process_" not in output

tests/test_models.py

@@ -14,8 +14,6 @@
 
 """Tests for data models."""
 
-from __future__ import annotations
-
 import pytest
 
 from owncastsentry.models import StreamConfig, StreamState, StreamStatus

tests/test_notification_service.py

@@ -14,17 +14,16 @@
 
 """Tests for the notification service."""
 
-from __future__ import annotations
-
 import logging
 import time
 from typing import TYPE_CHECKING
 
 import pytest
 
+from owncastsentry.metrics import MetricsService
 from owncastsentry.notification_service import NotificationService
 from owncastsentry.utils import SECONDS_BETWEEN_NOTIFICATIONS
-from tests.conftest import _StubMatrixClient
+from tests.conftest import _StubMatrixClient, generate_metrics_output
 
 if TYPE_CHECKING:
     from owncastsentry.database import StreamRepository, SubscriptionRepository
@@ -34,12 +33,14 @@ def _make_service(
     *,
     client: _StubMatrixClient,
     subscription_repo: SubscriptionRepository,
+    metrics: MetricsService | None = None,
 ) -> NotificationService:
     """Build a NotificationService with a stub client and real repo."""
     return NotificationService(
         client=client,
         subscription_repo=subscription_repo,
         logger=logging.getLogger("test"),
+        metrics=metrics or MetricsService(),
     )
 
 
@@ -62,7 +63,7 @@ class TestCanNotify:
         service = _make_service(
             client=_StubMatrixClient(), subscription_repo=subscription_repo
         )
-        service.notification_timers_cache["example.com"] = time.time()
+        service.notification_timers_cache["example.com"] = time.monotonic()
         assert service._can_notify("example.com") is False
 
     def test_after_cooldown_allowed(
@@ -74,7 +75,7 @@ class TestCanNotify:
         )
         # Subtract an extra second to ensure the cooldown has fully elapsed
         service.notification_timers_cache["example.com"] = (
-            time.time() - SECONDS_BETWEEN_NOTIFICATIONS - 1
+            time.monotonic() - SECONDS_BETWEEN_NOTIFICATIONS - 1
         )
         assert service._can_notify("example.com") is True
 
@@ -253,7 +254,7 @@ class TestNotifyStreamLive:
         """Skip sending when the domain is within the rate-limit cooldown."""
         client = _StubMatrixClient()
         service = _make_service(client=client, subscription_repo=subscription_repo)
-        service.notification_timers_cache["example.com"] = time.time()
+        service.notification_timers_cache["example.com"] = time.monotonic()
 
         await stream_repo.create("example.com")
         await subscription_repo.add("example.com", "!room1:matrix.org")
@@ -346,3 +347,111 @@ class TestSendCleanupDeletion:
             "If the instance comes online again and you want to "
             "resubscribe, run `!subscribe example.com`."
         )
+
+
+class TestNotificationMetrics:
+    """Notification metrics recording."""
+
+    async def test_records_live_notification(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Record a live notification metric."""
+        client = _StubMatrixClient()
+        metrics = MetricsService()
+        service = _make_service(
+            client=client, subscription_repo=subscription_repo, metrics=metrics
+        )
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room:matrix.org")
+        await service.notify_stream_live("example.com", "Stream", "Title", [])
+        output = generate_metrics_output(metrics)
+        expected = (
+            "owncastsentry_notification_delivery_total"
+            '{result="success",type="live"} 1.0'
+        )
+        assert expected in output
+
+    async def test_records_title_change_notification(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Record a title_change notification metric."""
+        client = _StubMatrixClient()
+        metrics = MetricsService()
+        service = _make_service(
+            client=client, subscription_repo=subscription_repo, metrics=metrics
+        )
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room:matrix.org")
+        await service.notify_stream_live(
+            "example.com", "Stream", "Title", [], title_change=True
+        )
+        output = generate_metrics_output(metrics)
+        expected = (
+            "owncastsentry_notification_delivery_total"
+            '{result="success",type="title_change"} 1.0'
+        )
+        assert expected in output
+
+    async def test_records_cleanup_warning_notification(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Record a cleanup_warning notification metric."""
+        client = _StubMatrixClient()
+        metrics = MetricsService()
+        service = _make_service(
+            client=client, subscription_repo=subscription_repo, metrics=metrics
+        )
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room:matrix.org")
+        await service.send_cleanup_warning("example.com")
+        output = generate_metrics_output(metrics)
+        expected = (
+            "owncastsentry_notification_delivery_total"
+            '{result="success",type="cleanup_warning"} 1.0'
+        )
+        assert expected in output
+
+    async def test_records_cleanup_deletion_notification(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Record a cleanup_deletion notification metric."""
+        client = _StubMatrixClient()
+        metrics = MetricsService()
+        service = _make_service(
+            client=client, subscription_repo=subscription_repo, metrics=metrics
+        )
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room:matrix.org")
+        await service.send_cleanup_deletion("example.com")
+        output = generate_metrics_output(metrics)
+        expected = (
+            "owncastsentry_notification_delivery_total"
+            '{result="success",type="cleanup_deletion"} 1.0'
+        )
+        assert expected in output
+
+    async def test_no_metric_when_rate_limited(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Do not record metric when notification is rate-limited."""
+        client = _StubMatrixClient()
+        metrics = MetricsService()
+        service = _make_service(
+            client=client, subscription_repo=subscription_repo, metrics=metrics
+        )
+        service.notification_timers_cache["example.com"] = time.monotonic()
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room:matrix.org")
+        await service.notify_stream_live("example.com", "Stream", "Title", [])
+        output = generate_metrics_output(metrics)
+        assert 'result="success",type="live"} 0.0' in output

tests/test_owncast_client.py

@@ -14,8 +14,6 @@
 
 """Tests for the Owncast HTTP client."""
 
-from __future__ import annotations
-
 import json
 import logging
 from typing import TYPE_CHECKING
@@ -23,8 +21,13 @@ from typing import TYPE_CHECKING
 import pytest
 from aioresponses import aioresponses
 
+from owncastsentry.metrics import MetricsService
 from owncastsentry.owncast_client import OwncastClient
-from tests.conftest import VALID_CONFIG_RESPONSE, VALID_STATUS_RESPONSE
+from tests.conftest import (
+    VALID_CONFIG_RESPONSE,
+    VALID_STATUS_RESPONSE,
+    generate_metrics_output,
+)
 
 if TYPE_CHECKING:
     from collections.abc import AsyncIterator
@@ -33,7 +36,11 @@ if TYPE_CHECKING:
 @pytest.fixture
 async def owncast_client() -> AsyncIterator[OwncastClient]:
     """Create an OwncastClient and close it after the test."""
-    client = OwncastClient(logger=logging.getLogger("test"), version="0.0.0")
+    client = OwncastClient(
+        logger=logging.getLogger("test"),
+        version="0.0.0",
+        metrics=MetricsService(),
+    )
     yield client
     await client.close()
 
@@ -205,3 +212,69 @@ class TestValidateInstance:
             result = await owncast_client.validate_instance("invalid.com")
 
         assert result is False
+
+
+class TestResponseTimeMetrics:
+    """Response time histogram recording."""
+
+    async def test_records_on_success(self) -> None:
+        """Record response time on a successful request."""
+        metrics = MetricsService()
+        client = OwncastClient(
+            logger=logging.getLogger("test"),
+            version="0.0.0",
+            metrics=metrics,
+        )
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://example.com/api/status",
+                body=json.dumps(VALID_STATUS_RESPONSE).encode(),
+            )
+            await client.get_stream_state("example.com")
+        output = generate_metrics_output(metrics)
+        assert 'owncastsentry_api_response_seconds{domain="example.com"}' in output
+        await client.close()
+
+    async def test_no_observation_on_failure(self) -> None:
+        """Do not record response time when request fails."""
+        metrics = MetricsService()
+        client = OwncastClient(
+            logger=logging.getLogger("test"),
+            version="0.0.0",
+            metrics=metrics,
+        )
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://example.com/api/status",
+                status=500,
+            )
+            await client.get_stream_state("example.com")
+        output = generate_metrics_output(metrics)
+        assert 'owncastsentry_api_response_seconds{domain="example.com"}' not in output
+        await client.close()
+
+    async def test_no_observation_on_connection_error(self) -> None:
+        """Do not record response time on connection error."""
+        metrics = MetricsService()
+        client = OwncastClient(
+            logger=logging.getLogger("test"),
+            version="0.0.0",
+            metrics=metrics,
+        )
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://example.com/api/status",
+                exception=ConnectionError(),
+            )
+            await client.get_stream_state("example.com")
+        output = generate_metrics_output(metrics)
+        assert 'owncastsentry_api_response_seconds{domain="example.com"}' not in output
+        await client.close()
+
+
+class TestOpenConnectionCount:
+    """Open connection count."""
+
+    async def test_zero_with_no_requests(self, owncast_client: OwncastClient) -> None:
+        """Return zero when no requests have been made."""
+        assert owncast_client.open_connection_count == 0

tests/test_stream_monitor.py

@@ -14,13 +14,12 @@
 
 """Tests for the stream monitor."""
 
-from __future__ import annotations
-
 import logging
 import time
 from typing import TYPE_CHECKING
 
-from owncastsentry.models import StreamConfig, StreamState
+from owncastsentry.metrics import MetricsService
+from owncastsentry.models import StreamConfig, StreamState, StreamStatus
 from owncastsentry.notification_service import NotificationService
 from owncastsentry.stream_monitor import StreamMonitor
 from owncastsentry.utils import (
@@ -28,7 +27,11 @@ from owncastsentry.utils import (
     CLEANUP_WARNING_THRESHOLD,
     SECONDS_BETWEEN_NOTIFICATIONS,
 )
-from tests.conftest import _StubMatrixClient, _StubOwncastClient
+from tests.conftest import (
+    _StubMatrixClient,
+    _StubOwncastClient,
+    generate_metrics_output,
+)
 
 if TYPE_CHECKING:
     from owncastsentry.database import StreamRepository, SubscriptionRepository
@@ -40,13 +43,16 @@ def _make_monitor(
     stream_repo: StreamRepository,
     subscription_repo: SubscriptionRepository,
     client: _StubMatrixClient,
+    metrics: MetricsService | None = None,
 ) -> tuple[StreamMonitor, NotificationService]:
     """Build a StreamMonitor with stubs and a real NotificationService."""
     logger = logging.getLogger("test")
+    metrics = metrics or MetricsService()
     notification_service = NotificationService(
         client=client,
         subscription_repo=subscription_repo,
         logger=logger,
+        metrics=metrics,
     )
     monitor = StreamMonitor(
         owncast_client=owncast_client,
@@ -54,6 +60,7 @@ def _make_monitor(
         subscription_repo=subscription_repo,
         notification_service=notification_service,
         logger=logger,
+        metrics=metrics,
     )
     return monitor, notification_service
 
@@ -82,6 +89,25 @@ async def _seed_stream(
     await subscription_repo.add(domain, room_id)
 
 
+def _make_monitor_with_metrics(
+    *,
+    owncast_client: _StubOwncastClient,
+    stream_repo: StreamRepository,
+    subscription_repo: SubscriptionRepository,
+    client: _StubMatrixClient,
+) -> tuple[StreamMonitor, NotificationService, MetricsService]:
+    """Build a StreamMonitor with stubs, a real NotificationService, and metrics."""
+    metrics = MetricsService()
+    monitor, notification_service = _make_monitor(
+        owncast_client=owncast_client,
+        stream_repo=stream_repo,
+        subscription_repo=subscription_repo,
+        client=client,
+        metrics=metrics,
+    )
+    return monitor, notification_service, metrics
+
+
 class TestUpdateAllStreams:
     """Parallel stream update orchestration."""
 
@@ -337,7 +363,7 @@ class TestUpdateStreamBriefOffline:
         )
 
         # Recently offline (within cooldown)
-        monitor.offline_timer_cache["brief.com"] = time.time() - 60
+        monitor.offline_timer_cache["brief.com"] = time.monotonic() - 60
 
         result = await monitor.update_stream("brief.com")
         assert result is True
@@ -375,7 +401,7 @@ class TestUpdateStreamBriefOffline:
         )
 
         # Recently offline (within cooldown)
-        monitor.offline_timer_cache["brief.com"] = time.time() - 60
+        monitor.offline_timer_cache["brief.com"] = time.monotonic() - 60
 
         result = await monitor.update_stream("brief.com")
         assert result is True
@@ -424,7 +450,7 @@ class TestUpdateStreamTitleChange:
         monitor.offline_timer_cache["title.com"] = 0
         # Subtract an extra second to ensure the cooldown has fully elapsed
         notification_service.notification_timers_cache["title.com"] = (
-            time.time() - SECONDS_BETWEEN_NOTIFICATIONS - 1
+            time.monotonic() - SECONDS_BETWEEN_NOTIFICATIONS - 1
         )
 
         result = await monitor.update_stream("title.com")
@@ -473,7 +499,7 @@ class TestUpdateStreamTitleChange:
         monitor.offline_timer_cache["title.com"] = 0
         # Subtract an extra second to ensure the cooldown has fully elapsed
         notification_service.notification_timers_cache["title.com"] = (
-            time.time() - SECONDS_BETWEEN_NOTIFICATIONS - 1
+            time.monotonic() - SECONDS_BETWEEN_NOTIFICATIONS - 1
         )
 
         result = await monitor.update_stream("title.com")
@@ -518,7 +544,7 @@ class TestUpdateStreamTitleChange:
 
         # Offline timer is MORE recent than last notification,
         # and both are old enough to pass rate limiting
-        now = time.time()
+        now = time.monotonic()
         monitor.offline_timer_cache["title.com"] = (
             now - SECONDS_BETWEEN_NOTIFICATIONS - 100
         )
@@ -571,9 +597,9 @@ class TestUpdateStreamGoesOffline:
         )
         monitor.offline_timer_cache["offline.com"] = 0
 
-        before = time.time()
+        before = time.monotonic()
         result = await monitor.update_stream("offline.com")
-        after = time.time()
+        after = time.monotonic()
 
         assert result is True
         assert before <= monitor.offline_timer_cache["offline.com"] <= after
@@ -837,3 +863,178 @@ class TestUpdateAllStreamsMixed:
         assert result.total_streams == 2
         assert result.successful_checks == 1
         assert result.failed_checks == 1
+
+
+class TestStreamMonitorMetrics:
+    """Stream monitor metrics recording."""
+
+    async def test_records_stream_status_online(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Record online stream status gauge."""
+        owncast = _StubOwncastClient(
+            stream_state=StreamState(
+                domain="live.com",
+                title="Title",
+                last_connect_time="2026-01-01T12:00:00Z",
+                last_disconnect_time="2026-01-01T10:00:00Z",
+            ),
+            stream_config=StreamConfig(name="Live Stream"),
+        )
+        client = _StubMatrixClient()
+        monitor, _, metrics = _make_monitor_with_metrics(
+            owncast_client=owncast,
+            stream_repo=stream_repo,
+            subscription_repo=subscription_repo,
+            client=client,
+        )
+        await _seed_stream(
+            stream_repo,
+            subscription_repo,
+            domain="live.com",
+            last_disconnect_time="2026-01-01T10:00:00Z",
+        )
+        monitor.offline_timer_cache["live.com"] = 0
+        await monitor.update_stream("live.com")
+        output = generate_metrics_output(metrics)
+        assert 'owncastsentry_stream_status{domain="live.com"} 1.0' in output
+
+    async def test_records_stream_status_offline(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Record offline stream status gauge."""
+        owncast = _StubOwncastClient(
+            stream_state=StreamState(
+                domain="off.com",
+                title="Title",
+                last_disconnect_time="2026-01-01T12:00:00Z",
+            ),
+            stream_config=StreamConfig(name="Off Stream"),
+        )
+        client = _StubMatrixClient()
+        monitor, _, metrics = _make_monitor_with_metrics(
+            owncast_client=owncast,
+            stream_repo=stream_repo,
+            subscription_repo=subscription_repo,
+            client=client,
+        )
+        await _seed_stream(
+            stream_repo,
+            subscription_repo,
+            domain="off.com",
+            title="Title",
+            last_disconnect_time="2026-01-01T12:00:00Z",
+        )
+        await monitor.update_stream("off.com")
+        output = generate_metrics_output(metrics)
+        assert 'owncastsentry_stream_status{domain="off.com"} 0.0' in output
+
+    async def test_records_check_failures_on_connection_failure(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Record failure counter gauge when a stream check fails."""
+        owncast = _StubOwncastClient(stream_state=None)
+        client = _StubMatrixClient()
+        monitor, _, metrics = _make_monitor_with_metrics(
+            owncast_client=owncast,
+            stream_repo=stream_repo,
+            subscription_repo=subscription_repo,
+            client=client,
+        )
+        await _seed_stream(
+            stream_repo,
+            subscription_repo,
+            domain="fail.com",
+            last_disconnect_time="2026-01-01T00:00:00Z",
+        )
+        await monitor.update_stream("fail.com")
+        output = generate_metrics_output(metrics)
+        assert 'owncastsentry_check_failures{domain="fail.com"} 1.0' in output
+
+    async def test_resets_check_failures_on_success(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Reset failure counter gauge to zero on successful check."""
+        owncast = _StubOwncastClient(
+            stream_state=StreamState(
+                domain="recover.com",
+                title="Title",
+                last_disconnect_time="2026-01-01T12:00:00Z",
+            ),
+            stream_config=StreamConfig(name="Recover"),
+        )
+        client = _StubMatrixClient()
+        monitor, _, metrics = _make_monitor_with_metrics(
+            owncast_client=owncast,
+            stream_repo=stream_repo,
+            subscription_repo=subscription_repo,
+            client=client,
+        )
+        await _seed_stream(
+            stream_repo,
+            subscription_repo,
+            domain="recover.com",
+            last_disconnect_time="2026-01-01T12:00:00Z",
+        )
+        # Simulate prior failures
+        for _ in range(3):
+            await stream_repo.increment_failure_counter("recover.com")
+        await monitor.update_stream("recover.com")
+        output = generate_metrics_output(metrics)
+        assert 'owncastsentry_check_failures{domain="recover.com"} 0.0' in output
+
+    async def test_removes_stream_on_cleanup_deletion(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Remove stream gauge label on cleanup deletion."""
+        owncast = _StubOwncastClient()
+        client = _StubMatrixClient()
+        monitor, _, metrics = _make_monitor_with_metrics(
+            owncast_client=owncast,
+            stream_repo=stream_repo,
+            subscription_repo=subscription_repo,
+            client=client,
+        )
+        await _seed_stream(stream_repo, subscription_repo, domain="delete.com")
+        metrics.set_stream_status("delete.com", StreamStatus.OFFLINE)
+        assert 'domain="delete.com"' in generate_metrics_output(metrics)
+
+        await monitor._check_cleanup_thresholds("delete.com", CLEANUP_DELETE_THRESHOLD)
+        assert 'domain="delete.com"' not in generate_metrics_output(metrics)
+
+    async def test_records_subscription_counts(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Record per-domain subscription counts after update_all_streams."""
+        owncast = _StubOwncastClient(
+            stream_state=StreamState(
+                domain="pop.com",
+                last_connect_time="2026-01-01T00:00:00Z",
+            ),
+            stream_config=StreamConfig(name="Popular"),
+        )
+        client = _StubMatrixClient()
+        monitor, _, metrics = _make_monitor_with_metrics(
+            owncast_client=owncast,
+            stream_repo=stream_repo,
+            subscription_repo=subscription_repo,
+            client=client,
+        )
+        await stream_repo.create("pop.com")
+        await subscription_repo.add("pop.com", "!room1:matrix.org")
+        await subscription_repo.add("pop.com", "!room2:matrix.org")
+        await monitor.update_all_streams(["pop.com"])
+        output = generate_metrics_output(metrics)
+        assert 'owncastsentry_stream_subscriptions{domain="pop.com"} 2.0' in output

tests/test_utils.py

@@ -14,8 +14,6 @@
 
 """Tests for utility functions and constants."""
 
-from __future__ import annotations
-
 import pytest
 
 from owncastsentry.utils import (

uv.lock

@@ -924,6 +924,9 @@ wheels = [
 [[package]]
 name = "owncastsentry"
 source = { editable = "." }
+dependencies = [
+    { name = "prometheus-client" },
+]
 
 [package.dev-dependencies]
 dev = [
@@ -941,6 +944,7 @@ dev = [
 ]
 
 [package.metadata]
+requires-dist = [{ name = "prometheus-client", specifier = ">=0.24.1" }]
 
 [package.metadata.requires-dev]
 dev = [
@@ -953,7 +957,7 @@ dev = [
     { name = "pytest", specifier = ">=9.0.2" },
     { name = "pytest-asyncio", specifier = ">=1.3.0" },
     { name = "pytest-cov", specifier = ">=7.0.0" },
-    { name = "ruff", specifier = ">=0.15.5" },
+    { name = "ruff", specifier = ">=0.15.6" },
     { name = "time-machine", specifier = ">=3.2.0" },
 ]
 
@@ -1069,6 +1073,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/54/20/4d324d65cc6d9205fabedc306948156824eb9f0ee1633355a8f7ec5c66bf/pluggy-1.6.0-py3-none-any.whl", hash = "sha256:e920276dd6813095e9377c0bc5566d94c932c33b27a3e3945d8389c374dd4746", size = 20538, upload-time = "2025-05-15T12:30:06.134Z" },
 ]
 
+[[package]]
+name = "prometheus-client"
+version = "0.24.1"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/f0/58/a794d23feb6b00fc0c72787d7e87d872a6730dd9ed7c7b3e954637d8f280/prometheus_client-0.24.1.tar.gz", hash = "sha256:7e0ced7fbbd40f7b84962d5d2ab6f17ef88a72504dcf7c0b40737b43b2a461f9", size = 85616, upload-time = "2026-01-14T15:26:26.965Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/74/c3/24a2f845e3917201628ecaba4f18bab4d18a337834c1df2a159ee9d22a42/prometheus_client-0.24.1-py3-none-any.whl", hash = "sha256:150db128af71a5c2482b36e588fc8a6b95e498750da4b17065947c16070f4055", size = 64057, upload-time = "2026-01-14T15:26:24.42Z" },
+]
+
 [[package]]
 name = "prompt-toolkit"
 version = "3.0.52"
@@ -1341,27 +1354,27 @@ wheels = [
 
 [[package]]
 name = "ruff"
-version = "0.15.5"
+version = "0.15.6"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/77/9b/840e0039e65fcf12758adf684d2289024d6140cde9268cc59887dc55189c/ruff-0.15.5.tar.gz", hash = "sha256:7c3601d3b6d76dce18c5c824fc8d06f4eef33d6df0c21ec7799510cde0f159a2", size = 4574214, upload-time = "2026-03-05T20:06:34.946Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/51/df/f8629c19c5318601d3121e230f74cbee7a3732339c52b21daa2b82ef9c7d/ruff-0.15.6.tar.gz", hash = "sha256:8394c7bb153a4e3811a4ecdacd4a8e6a4fa8097028119160dffecdcdf9b56ae4", size = 4597916, upload-time = "2026-03-12T23:05:47.51Z" }
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