code: public static Counter counter(MetricLevel level, String name) {
      return getMetricRegistry(level).counter(METRIC_PREFIX + name);
    }
docs: Creates a named {@link Counter}. This is a shortcut for
  {@link BigtableClientMetrics#getMetricRegistry(MetricLevel)}.
  {@link MetricRegistry#counter(String)}.
  
  @return a {@link Counter}