fabriziofortino commented on code in PR #1182:
URL: https://github.com/apache/jackrabbit-oak/pull/1182#discussion_r1395720389


##########
oak-run-commons/src/main/java/org/apache/jackrabbit/oak/index/indexer/document/flatfile/pipelined/MetricsUtils.java:
##########
@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.jackrabbit.oak.index.indexer.document.flatfile.pipelined;
+
+interface PipelinedMetrics {

Review Comment:
   this is considered by many an antipattern (see Constant interface 
anti-pattern). In general, I tend to have the constant in the classes where 
they are used most. Arguments are mainly stylistic, so feel free to find 
alternatives.



##########
oak-run-commons/src/main/java/org/apache/jackrabbit/oak/index/indexer/document/flatfile/pipelined/PipelinedStrategy.java:
##########
@@ -222,9 +226,10 @@ private static void 
prettyPrintTransformStatisticsHistograms(TransformStageStati
 
 
     /**
-     * @param pathPredicate Used by the transform stage to test if a node 
should be kept or discarded.
-     * @param pathFilters   If non-empty, the download stage will use these 
filters to try to create a query that downloads
-     *                      only the matching MongoDB documents.
+     * @param pathPredicate      Used by the transform stage to test if a node 
should be kept or discarded.
+     * @param pathFilters        If non-empty, the download stage will use 
these filters to try to create a query that downloads
+     *                           only the matching MongoDB documents.
+     * @param statisticsProvider

Review Comment:
   add a description or remove the `@param`



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