Metrics2: Store a registry of Counters

perf/go/alerting/alerting.go

 package alerting
 
 import (
         "database/sql"
         "encoding/json"
         "fmt"
         "math"
         "time"
 
         "github.com/skia-dev/glog"
@@ skipping 314 matching lines @@
                         count++
                 }
         }
         glog.Infof("Updated new cluster count: %d", count)
         newClustersGauge.Update(int64(count))
 }
 
 // Start kicks off a go routine the periodically refreshes the current alerting clusters.
 func Start(tb tracedb.MasterTileBuilder) {
         newClustersGauge = metrics2.GetInt64Metric("perf.clustering.untriaged", nil)
-        runsCounter = metrics2.NewCounter("perf.clustering.runs", nil)
+        runsCounter = metrics2.GetCounter("perf.clustering.runs", nil)
         clusteringLatency = metrics2.NewTimer("perf.clustering.latency", nil)
         tileBuilder = tb
         client, err := auth.NewDefaultJWTServiceAccountClient("https://www.googleapis.com/auth/userinfo.email")
         if err != nil {
                 glog.Errorf("Not updating bugs, not able to construct an authenticated client: %s", err)
         }
         var issueTracker issues.IssueTracker = nil
         if client != nil {
                 issueTracker = issues.NewMonorailIssueTracker(client)
         }
 
         go func() {
                 for _ = range time.Tick(config.RECLUSTER_DURATION) {
                         singleStep(issueTracker)
                 }
         }()
 }