Add CPU monitoring to stream health overview

metrics/healthOverview.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/owncast/owncast/core/data"
 	"github.com/owncast/owncast/models"
+	"github.com/owncast/owncast/utils"
 )
 
 var errorMessages = map[string]string{
@@ -85,6 +86,19 @@ func generateStreamHealthOverview() {
 		}
 	}
 
+	// Report high CPU use.
+	if unhealthyClientCount == 0 && len(metrics.CPUUtilizations) > 2 {
+		recentCPUUses := metrics.CPUUtilizations[len(metrics.CPUUtilizations)-2:]
+		values := make([]float64, len(recentCPUUses))
+		for i, val := range recentCPUUses {
+			values[i] = val.Value
+		}
+		recentCPUUse := utils.Avg(values)
+		if recentCPUUse > 90 {
+			overview.Message = "The CPU usage on your server is over 90%. This may cause video to be provided slower than necessarily, causing buffering for your viewers. Consider increasing the resources available or reducing the number of output variants you made available."
+		}
+	}
+
 	if unhealthyClientCount == 0 {
 		return
 	}