code: public static RateLimiterMetrics ofIterable(String prefix, Iterable<RateLimiter> rateLimiters) {
          return new RateLimiterMetrics(prefix, rateLimiters);
      }
docs: Creates a new instance {@link RateLimiterMetrics} with
  an {@link Iterable} of rate limiters as a source.
  
  @param rateLimiters the rate limiters