@Override
  public <T> Gauge<T> newGauge(String group, String name, T value) {
    Gauge<T> gauge = new Gauge<>(name, value);
    return newGauge(group, gauge);
  }
retrieves the Map of Timers
@return timers
samza-sql/src/test/java/org/apache/samza/sql/util/TestMetricsRegistryImpl.java