[#371] ir: Add morph cache metrics

Signed-off-by: Airat Arifullin a.arifullin@yadro.com

pkg/metrics/morphcache.go

@@ -0,0 +1,77 @@
+package metrics
+
+import (
+	"fmt"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-observability/metrics"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+const (
+	mcSubsystem = "morphcache"
+	mcSuccess   = "success"
+)
+
+type MorphCacheMetrics interface {
+	AddNNSContractHashDuration(success bool, d time.Duration)
+
+	AddGroupKeyDuration(success bool, d time.Duration)
+
+	AddTxHeightDuration(hash util.Uint256, success bool, d time.Duration)
+}
+
+type morphCacheMetrics struct {
+	// Duration of processing get nns contract hash request
+	nnsContractHashDuration *prometheus.HistogramVec
+
+	// Duration of processing get group key request
+	groupKeyDuration *prometheus.HistogramVec
+
+	// Duration of processing get tx height request
+	txHeightDuration *prometheus.HistogramVec
+}
+
+var _ MorphCacheMetrics = (*morphCacheMetrics)(nil)
+
+func newMorphCacheMetrics() *morphCacheMetrics {
+	return &morphCacheMetrics{
+		nnsContractHashDuration: newMCMethodDurationCounter("nns_contract_hash"),
+		groupKeyDuration:        newMCMethodDurationCounter("group_key"),
+		txHeightDuration:        newMCMethodDurationCounter("tx_height"),
+	}
+}
+
+func (m *morphCacheMetrics) AddNNSContractHashDuration(success bool, d time.Duration) {
+	m.nnsContractHashDuration.With(
+		prometheus.Labels{
+			mcSuccess: fmt.Sprintf("%v", success),
+		},
+	).Observe(float64(d))
+}
+
+func (m *morphCacheMetrics) AddGroupKeyDuration(success bool, d time.Duration) {
+	m.groupKeyDuration.With(
+		prometheus.Labels{
+			mcSuccess: fmt.Sprintf("%v", success),
+		},
+	).Observe(float64(d))
+}
+
+func (m *morphCacheMetrics) AddTxHeightDuration(hash util.Uint256, success bool, d time.Duration) {
+	m.txHeightDuration.With(
+		prometheus.Labels{
+			mcSuccess: fmt.Sprintf("%v", success),
+		},
+	).Observe(float64(d))
+}
+
+func newMCMethodDurationCounter(method string) *prometheus.HistogramVec {
+	return metrics.NewHistogramVec(prometheus.HistogramOpts{
+		Namespace: namespace,
+		Subsystem: mcSubsystem,
+		Name:      fmt.Sprintf("%s_req_duration_seconds", method),
+		Help:      fmt.Sprintf("Accumulated %s request process duration", method),
+	}, []string{mcSuccess})
+}