consensus: backport abci and consensus metrics (#9273)

Partial backport of #8480

state/execution.go

@@ -233,6 +233,10 @@ func (blockExec *BlockExecutor) ApplyBlock(
 	}
 	if len(validatorUpdates) > 0 {
 		blockExec.logger.Debug("updates to validators", "updates", types.ValidatorListString(validatorUpdates))
+		blockExec.metrics.ValidatorSetUpdates.Add(1)
+	}
+	if abciResponses.EndBlock.ConsensusParamUpdates != nil {
+		blockExec.metrics.ConsensusParamUpdates.Add(1)
 	}
 
 	// Update the state with the block and responses.

state/metrics.gen.go

@@ -22,11 +22,25 @@ func PrometheusMetrics(namespace string, labelsAndValues ...string) *Metrics {
 
 			Buckets: stdprometheus.LinearBuckets(1, 10, 10),
 		}, labels).With(labelsAndValues...),
+		ConsensusParamUpdates: prometheus.NewCounterFrom(stdprometheus.CounterOpts{
+			Namespace: namespace,
+			Subsystem: MetricsSubsystem,
+			Name:      "consensus_param_updates",
+			Help:      "ConsensusParamUpdates is the total number of times the application has udated the consensus params since process start.",
+		}, labels).With(labelsAndValues...),
+		ValidatorSetUpdates: prometheus.NewCounterFrom(stdprometheus.CounterOpts{
+			Namespace: namespace,
+			Subsystem: MetricsSubsystem,
+			Name:      "validator_set_updates",
+			Help:      "ValidatorSetUpdates is the total number of times the application has udated the validator set since process start.",
+		}, labels).With(labelsAndValues...),
 	}
 }
 
 func NopMetrics() *Metrics {
 	return &Metrics{
-		BlockProcessingTime: discard.NewHistogram(),
+		BlockProcessingTime:   discard.NewHistogram(),
+		ConsensusParamUpdates: discard.NewCounter(),
+		ValidatorSetUpdates:   discard.NewCounter(),
 	}
 }

state/metrics.go

@@ -16,4 +16,12 @@ const (
 type Metrics struct {
 	// Time between BeginBlock and EndBlock in ms.
 	BlockProcessingTime metrics.Histogram `metrics_buckettype:"lin" metrics_bucketsizes:"1, 10, 10"`
+
+	// ConsensusParamUpdates is the total number of times the application has
+	// udated the consensus params since process start.
+	ConsensusParamUpdates metrics.Counter
+
+	// ValidatorSetUpdates is the total number of times the application has
+	// udated the validator set since process start.
+	ValidatorSetUpdates metrics.Counter
 }