refactor: change eval sleep

Author: 710leo

alert/eval/alert_rule.go

@@ -149,6 +149,7 @@ func (s *Scheduler) syncAlertRules() {
 	for hash, rule := range alertRuleWorkers {
 		if _, has := s.alertRules[hash]; !has {
 			rule.Prepare()
+			time.Sleep(time.Duration(20) * time.Millisecond)
 			rule.Start()
 			s.alertRules[hash] = rule
 		}

alert/eval/eval.go

@@ -25,7 +25,6 @@ import (
 	"github.com/ccfos/nightingale/v6/pkg/unit"
 	"github.com/ccfos/nightingale/v6/prom"
 	"github.com/prometheus/common/model"
-	"golang.org/x/exp/rand"
 
 	"github.com/robfig/cron/v3"
 	"github.com/toolkits/pkg/logger"
@@ -137,14 +136,11 @@ func (arw *AlertRuleWorker) Prepare() {
 }
 
 func (arw *AlertRuleWorker) Start() {
-	randomWait := time.Duration(rand.Intn(60000)) * time.Millisecond
-	time.Sleep(randomWait)
-
-	logger.Infof("eval:%s started after waiting %d ms", arw.Key(), randomWait)
 	arw.Scheduler.Start()
 }
 
 func (arw *AlertRuleWorker) Eval() {
+	logger.Infof("eval:%s started", arw.Key())
 	if arw.Processor.PromEvalInterval == 0 {
 		arw.Processor.PromEvalInterval = getPromEvalInterval(arw.Processor.ScheduleEntry.Schedule)
 	}