Reduce noisy no-alertmanager warning

cmd/prometheus/main.go

@@ -155,7 +155,6 @@ func Main() int {
 	prometheus.MustRegister(configSuccess)
 	prometheus.MustRegister(configSuccessTime)
 
-	// go ruleManager.Run()
 	defer ruleManager.Stop()
 
 	go notificationHandler.Run()

notification/notification.go

@@ -159,6 +159,11 @@ func (n *Handler) nextBatch() []*model.Alert {
 
 // Run dispatches notifications continuously.
 func (n *Handler) Run() {
+	// Just warn one in the beginning to prevent nosiy logs.
+	if n.opts.AlertmanagerURL == "" {
+		log.Warnf("No AlertManager configured, not dispatching any alerts")
+	}
+
 	for {
 		select {
 		case <-n.ctx.Done():
@@ -172,7 +177,6 @@ func (n *Handler) Run() {
 			continue
 		}
 		if n.opts.AlertmanagerURL == "" {
-			log.Warn("No AlertManager configured, not dispatching %d alerts", len(alerts))
 			n.dropped.Add(float64(len(alerts)))
 			continue
 		}

rules/manager_test.go

@@ -15,7 +15,6 @@ package rules
 
 import (
 	"fmt"
-	// "reflect"
 	"strings"
 	"testing"
 	"time"