[#374] Add inner-ring event metrics

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

pkg/innerring/processors/balance/process_assets.go

@@ -9,10 +9,10 @@ import (
 
 // Process lock event by invoking Cheque method in main net to send assets
 // back to the withdraw issuer.
-func (bp *Processor) processLock(lock *balanceEvent.Lock) {
+func (bp *Processor) processLock(lock *balanceEvent.Lock) bool {
 	if !bp.alphabetState.IsAlphabet() {
 		bp.log.Info(logs.BalanceNonAlphabetModeIgnoreBalanceLock)
-		return
+		return true
 	}
 
 	prm := frostfsContract.ChequePrm{}
@@ -26,5 +26,8 @@ func (bp *Processor) processLock(lock *balanceEvent.Lock) {
 	err := bp.frostfsClient.Cheque(prm)
 	if err != nil {
 		bp.log.Error(logs.BalanceCantSendLockAssetTx, zap.Error(err))
+		return false
 	}
+
+	return true
 }