[#374] Add inner-ring event metrics

Signed-off-by: Alejandro Lopez <a.lopez@yadro.com>

pkg/innerring/processors/container/processor.go

@@ -6,6 +6,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
 	containercore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/container"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/innerring/metrics"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/morph/client/frostfsid"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/morph/event"
 	containerEvent "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/morph/event/container"
@@ -40,6 +41,7 @@ type (
 	// Processor of events produced by container contract in the sidechain.
 	Processor struct {
 		log           *logger.Logger
+		metrics       metrics.Register
 		pool          *ants.Pool
 		alphabetState AlphabetState
 		cnrClient     ContClient // notary must be enabled
@@ -51,6 +53,7 @@ type (
 	// Params of the processor constructor.
 	Params struct {
 		Log             *logger.Logger
+		Metrics         metrics.Register
 		PoolSize        int
 		AlphabetState   AlphabetState
 		ContainerClient ContClient
@@ -102,8 +105,14 @@ func New(p *Params) (*Processor, error) {
 		return nil, fmt.Errorf("ir/container: can't create worker pool: %w", err)
 	}
 
+	metricsRegister := p.Metrics
+	if metricsRegister == nil {
+		metricsRegister = metrics.DefaultRegister{}
+	}
+
 	return &Processor{
 		log:           p.Log,
+		metrics:       metricsRegister,
 		pool:          pool,
 		alphabetState: p.AlphabetState,
 		cnrClient:     p.ContainerClient,