public void addHFileRefs(TableName tableName, byte[] family, List<Pair<Path, Path>> pairs)
    throws IOException {
    for (ReplicationSourceInterface source : this.sources.values()) {
      throwIOExceptionWhenFail(() -> source.addHFileRefs(tableName, family, pairs));
    }
  }
Get a string representation of all the sources' metrics
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceManager.java