AbstractMetrics.java 文件源码

/**
 * Builds a complete metric name, of the form prefix.resource.metric
 *
 * @param request The broker request containing all the information
 * @param metricName The metric name to register
 * @return The complete metric name
 */
private String buildMetricName(@Nullable BrokerRequest request, String metricName) {
  if (request != null && request.getQuerySource() != null && request.getQuerySource().getTableName() != null) {
    return _metricPrefix + getTableName(request.getQuerySource().getTableName()) + "." + metricName;
  } else {
    return _metricPrefix + "unknown." + metricName;
  }
}