docs: private void trackExternalRequestRate(Span span, String operationName, SpanContextInformation spanContext, boolean trackMetricsByOperationName) {
  		int totalCount = 0;
  		for (SpanContextInformation.ExternalRequestStats externalRequestStats : spanContext.getExternalRequestStats()) {
  			long durationNanos = externalRequestStats.getExecutionTimeNanos();
  			final String requestType = externalRequestStats.getRequestType();
  			span.setTag("external_requests." + requestType + ".duration_ms", durationNanos / MILLISECOND_IN_NANOS);
  			span.setTag("external_requests." + requestType + ".count", externalRequestStats.getExecutionCount());
  			totalCount += externalRequestStats.getExecutionCount();
  		}
  		if (trackMetricsByOperationName) {
  			metricRegistry.meter(externalRequestRateTemplate
  					.build(operationName))
  					.mark(totalCount);
  		}
  	}