public DynamicMetricsRegistry tag(MetricsInfo info, String value) {
    return tag(info, value, false);
  }
Add a tag to the metrics
@param info     metadata of the tag
@param value    of the tag
@param override existing tag if true
@return the registry (for keep adding tags etc.)
hbase-hadoop-compat/src/main/java/org/apache/hadoop/metrics2/lib/DynamicMetricsRegistry.java