[#374] Add inner-ring event metrics

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

pkg/innerring/processors/alphabet/processor.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/innerring/metrics"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/morph/event"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
@@ -50,6 +51,7 @@ type (
 		// protects parsedWallets from concurrent change
 		pwLock            *sync.RWMutex
 		log               *logger.Logger
+		metrics           metrics.Register
 		pool              *ants.Pool
 		alphabetContracts Contracts
 		netmapClient      netmapClient
@@ -62,6 +64,7 @@ type (
 	Params struct {
 		ParsedWallets     []util.Uint160
 		Log               *logger.Logger
+		Metrics           metrics.Register
 		PoolSize          int
 		AlphabetContracts Contracts
 		NetmapClient      netmapClient
@@ -89,10 +92,16 @@ func New(p *Params) (*Processor, error) {
 		return nil, fmt.Errorf("ir/frostfs: can't create worker pool: %w", err)
 	}
 
+	metricsRegister := p.Metrics
+	if metricsRegister == nil {
+		metricsRegister = metrics.DefaultRegister{}
+	}
+
 	return &Processor{
 		parsedWallets:     p.ParsedWallets,
 		pwLock:            new(sync.RWMutex),
 		log:               p.Log,
+		metrics:           metricsRegister,
 		pool:              pool,
 		alphabetContracts: p.AlphabetContracts,
 		netmapClient:      p.NetmapClient,