[#373] metrics: Add blobstor metrics

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/metrics/blobstore.go

@@ -0,0 +1,87 @@
+package metrics
+
+import (
+	"strconv"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-observability/metrics"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type BlobstoreMetrics interface {
+	SetMode(shardID string, readOnly bool)
+	Close(shardID string)
+
+	MethodDuration(shardID string, method string, d time.Duration, success bool, withStorageID NullBool)
+	AddPut(shardID string, size int)
+	AddGet(shardID string, size int)
+}
+
+type blobstoreMetrics struct {
+	mode        *shardIDModeValue
+	reqDuration *prometheus.HistogramVec
+	put         *prometheus.CounterVec
+	get         *prometheus.CounterVec
+}
+
+func newBlobstoreMetrics() *blobstoreMetrics {
+	return &blobstoreMetrics{
+		mode: newShardIDMode(blobstoreSubSystem, "mode", "Blobstore mode value"),
+		reqDuration: metrics.NewHistogramVec(prometheus.HistogramOpts{
+			Namespace: namespace,
+			Subsystem: blobstoreSubSystem,
+			Name:      "request_duration_seconds",
+			Help:      "Accumulated Blobstore request process duration",
+		}, []string{shardIDLabel, successLabel, methodLabel, withStorageIDLabel}),
+		put: metrics.NewCounterVec(prometheus.CounterOpts{
+			Namespace: namespace,
+			Subsystem: blobstoreSubSystem,
+			Name:      "put_bytes",
+			Help:      "Accumulated payload size written to Blobstore",
+		}, []string{shardIDLabel}),
+		get: metrics.NewCounterVec(prometheus.CounterOpts{
+			Namespace: namespace,
+			Subsystem: blobstoreSubSystem,
+			Name:      "get_bytes",
+			Help:      "Accumulated payload size read from Blobstore",
+		}, []string{shardIDLabel}),
+	}
+}
+
+func (m *blobstoreMetrics) SetMode(shardID string, readOnly bool) {
+	m.mode.SetMode(shardID, modeFromBool(readOnly))
+}
+
+func (m *blobstoreMetrics) Close(shardID string) {
+	m.mode.SetMode(shardID, closedMode)
+	m.reqDuration.DeletePartialMatch(prometheus.Labels{
+		shardIDLabel: shardID,
+	})
+	m.get.DeletePartialMatch(prometheus.Labels{
+		shardIDLabel: shardID,
+	})
+	m.put.DeletePartialMatch(prometheus.Labels{
+		shardIDLabel: shardID,
+	})
+}
+
+func (m *blobstoreMetrics) MethodDuration(shardID string, method string, d time.Duration, success bool, withStorageID NullBool) {
+	m.reqDuration.With(prometheus.Labels{
+		shardIDLabel:       shardID,
+		successLabel:       strconv.FormatBool(success),
+		methodLabel:        method,
+		withStorageIDLabel: withStorageID.String(),
+	}).Observe(d.Seconds())
+}
+
+func (m *blobstoreMetrics) AddPut(shardID string, size int) {
+	m.put.With(prometheus.Labels{
+		shardIDLabel: shardID,
+	}).Add(float64(size))
+}
+
+func (m *blobstoreMetrics) AddGet(shardID string, size int) {
+	m.get.With(prometheus.Labels{
+		shardIDLabel: shardID,
+	}).Add(float64(size))
+}