add the scheduling configuration metrics (#1406)

Signed-off-by: rleungx <rleungx@gmail.com>

server/metrics.go

@@ -154,6 +154,14 @@ var (
 			Help:      "Bucketed histogram of time spend(s) of patrol checks region.",
 			Buckets:   prometheus.ExponentialBuckets(1, 2, 15),
 		})
+
+	configStatusGauge = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Namespace: "pd",
+			Subsystem: "config",
+			Name:      "status",
+			Help:      "Status of the scheduling configurations.",
+		}, []string{"type", "namespace"})
 )
 
 func init() {
@@ -173,4 +181,5 @@ func init() {
 	prometheus.MustRegister(etcdStateGauge)
 	prometheus.MustRegister(patrolCheckRegionsHistogram)
 	prometheus.MustRegister(placementStatusGauge)
+	prometheus.MustRegister(configStatusGauge)
 }

server/store_statistics.go

@@ -120,6 +120,44 @@ func (s *storeStatistics) Collect() {
 		clusterStatusGauge.WithLabelValues(typ, s.namespace).Set(value)
 	}
 
+	// Current scheduling configurations of the cluster
+	configs := make(map[string]float64)
+	configs["leader_schedule_limit"] = float64(s.opt.GetLeaderScheduleLimit(s.namespace))
+	configs["region_schedule_limit"] = float64(s.opt.GetRegionScheduleLimit(s.namespace))
+	configs["merge_schedule_limit"] = float64(s.opt.GetMergeScheduleLimit(s.namespace))
+	configs["replica_schedule_limit"] = float64(s.opt.GetReplicaScheduleLimit(s.namespace))
+	configs["max_replicas"] = float64(s.opt.GetMaxReplicas(s.namespace))
+	configs["high_space_ratio"] = float64(s.opt.GetHighSpaceRatio())
+	configs["low_space_ratio"] = float64(s.opt.GetLowSpaceRatio())
+	configs["tolerant_size_ratio"] = float64(s.opt.GetTolerantSizeRatio())
+
+	var disableMakeUpReplica, disableLearner, disableRemoveDownReplica, disableRemoveExtraReplica, disableReplaceOfflineReplica float64
+	if !s.opt.IsMakeUpReplicaEnabled() {
+		disableMakeUpReplica = 1
+	}
+	if !s.opt.IsRaftLearnerEnabled() {
+		disableLearner = 1
+	}
+	if !s.opt.IsRemoveDownReplicaEnabled() {
+		disableRemoveDownReplica = 1
+	}
+	if !s.opt.IsRemoveExtraReplicaEnabled() {
+		disableRemoveExtraReplica = 1
+	}
+	if !s.opt.IsReplaceOfflineReplicaEnabled() {
+		disableReplaceOfflineReplica = 1
+	}
+
+	configs["disable_makeup_replica"] = disableMakeUpReplica
+	configs["disable_learner"] = disableLearner
+	configs["disable_remove_down_replica"] = disableRemoveDownReplica
+	configs["disable_remove_extra_replica"] = disableRemoveExtraReplica
+	configs["disable_replace_offline_replica"] = disableReplaceOfflineReplica
+
+	for typ, value := range configs {
+		configStatusGauge.WithLabelValues(typ, s.namespace).Set(value)
+	}
+
 	for name, value := range s.LabelCounter {
 		placementStatusGauge.WithLabelValues(labelType, name, s.namespace).Set(float64(value))
 	}