[#606] Reorganize some log tags

Signed-off-by: Alex Vanin <a.vanin@yadro.com>

api/middleware/metrics.go

@@ -139,7 +139,7 @@ func resolveCID(log *zap.Logger, resolveContainerID ContainerIDResolveFunc) cidR
 
 		containerID, err := resolveContainerID(ctx, reqInfo.BucketName)
 		if err != nil {
-			reqLogOrDefault(ctx, log).Debug(logs.FailedToResolveCID, zap.Error(err), logs.TagField(logs.TagExternalBlockchain))
+			reqLogOrDefault(ctx, log).Debug(logs.FailedToResolveCID, zap.Error(err), logs.TagField(logs.TagDatapath))
 			return ""
 		}