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