comment unused struct fields

pkg/services/alerting/engine.go

@@ -15,8 +15,8 @@ import (
 )
 
 type Engine struct {
-	execQueue     chan *Job
-	clock         clock.Clock
+	execQueue chan *Job
+	//clock         clock.Clock
 	ticker        *Ticker
 	scheduler     Scheduler
 	evalHandler   EvalHandler

pkg/services/alerting/reader.go

@@ -16,7 +16,7 @@ type RuleReader interface {
 
 type DefaultRuleReader struct {
 	sync.RWMutex
-	serverID       string
+	//serverID       string
 	serverPosition int
 	clusterSize    int
 	log            log.Logger