code: public static RateLimiterMetrics ofRateLimiterRegistry(String prefix, RateLimiterRegistry rateLimiterRegistry) {
          return new RateLimiterMetrics(prefix, rateLimiterRegistry.getAllRateLimiters());
      }
docs: Creates a new instance {@link RateLimiterMetrics} with specified metrics names prefix and
  a {@link RateLimiterRegistry} as a source.
  
  @param prefix              the prefix of metrics names
  @param rateLimiterRegistry the registry of rate limiters