Method registerBatchCallback

api/src/main/java/io/grpc/MetricSink.java:134–134

Registers a callback to produce metric values for only the listed instruments. The returned registration must be closed when no longer needed, which will remove the callback. @param callback The callback to call to record. @param metricInstruments The metric instruments the callback will record aga

(Runnable callback,
      CallbackMetricInstrument... metricInstruments)

   * @param metricInstruments The metric instruments the callback will record against.
   */
  default Registration registerBatchCallback(Runnable callback,
      CallbackMetricInstrument... metricInstruments) {
    return () -> { };
  }