modify metric resource_manager_resource_unit_service_limit (tikv#468)

* modify metric resource_manager_resource_unit_service_limit

* modify metric resource_manager_resource_unit_service_limit

* upt

Author: zuowei593

pkg/mcs/resourcemanager/server/manager.go

@@ -720,7 +720,7 @@ func (m *Manager) backgroundMetricsFlush(ctx context.Context, pushMetricsAddr st
 				resourceGroupConfigGauge.DeletePartialMatch(prometheus.Labels{newResourceGroupNameLabel: r.name})
 				requestUnitSumPerSec.DeleteLabelValues(r.name)
 				requestUnitConsumeRate.DeleteLabelValues(r.name)
-				resourceUnitServiceLimit.DeleteLabelValues(r.name)
+				resourceUnitServiceLimit.DeleteLabelValues(r.name, r.name)
 			}
 
 		case <-availableRUTicker.C:
@@ -759,7 +759,7 @@ func (m *Manager) backgroundMetricsFlush(ctx context.Context, pushMetricsAddr st
 			m.RUnlock()
 			for i, name := range names {
 				rcuTrackers[name].FlushMetrics(rcuLimit[i], cpuMsCost)
-				resourceUnitServiceLimit.WithLabelValues(name).Set(rcuLimit[i])
+				resourceUnitServiceLimit.WithLabelValues(name, name).Set(rcuLimit[i])
 			}
 
 		case <-pushMetricsTickerC:

pkg/mcs/resourcemanager/server/metrics.go

@@ -159,9 +159,9 @@ var (
 		prometheus.GaugeOpts{
 			Namespace: namespace,
 			Subsystem: ruSubsystem,
-			Name:      "resource_unit_service_limit",
+			Name:      "service_limit",
 			Help:      "Fill rate value for all resource groups.",
-		}, []string{newResourceGroupNameLabel})
+		}, []string{resourceGroupNameLabel, newResourceGroupNameLabel})
 
 	syncLoadGroupCounter = prometheus.NewCounter(
 		prometheus.CounterOpts{