[#1210] reputation: Improve debug logs

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/services/reputation/eigentrust/routes/calls.go

@@ -5,13 +5,21 @@ import (
 
 	"github.com/nspcc-dev/neofs-node/pkg/services/reputation"
 	"github.com/nspcc-dev/neofs-node/pkg/services/reputation/common"
+	"go.uber.org/zap"
 )
 
 // NextStage builds Manager list for trusted node and returns it directly.
 //
 // If passed route has more than one point, then endpoint of the route is reached.
 func (b *Builder) NextStage(epoch uint64, t reputation.Trust, passed []common.ServerInfo) ([]common.ServerInfo, error) {
-	if len(passed) > 1 {
+	passedLen := len(passed)
+
+	b.log.Debug("building next stage for trust route",
+		zap.Uint64("epoch", epoch),
+		zap.Int("passed_length", passedLen),
+	)
+
+	if passedLen > 1 {
 		return nil, nil
 	}