Simple hardware metrics collection + alerting (#115)

* Add CPU and RAM usage alerting

* Create basic troubleshooting document to point alerts at

* Limit max number of hardware values collected

* Save metric value with the point in time it was taken

main.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/gabek/owncast/config"
 	"github.com/gabek/owncast/core"
+	"github.com/gabek/owncast/metrics"
 	"github.com/gabek/owncast/router"
 )
 
@@ -55,6 +56,8 @@ func main() {
 		config.Config.ChatDatabaseFilePath = "chat.db"
 	}
 
+	metrics.Start()
+
 	// starts the core
 	if err := core.Start(); err != nil {
 		log.Error("failed to start the core package")