src/main/java/com/googlesource/gerrit/plugins/kafka/subscribe/KafkaEventSubscriberMetrics.java

package com.googlesource.gerrit.plugins.kafka.subscribe;

import com.google.gerrit.metrics.Counter1;
import com.google.gerrit.metrics.Description;
import com.google.gerrit.metrics.MetricMaker;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.googlesource.gerrit.plugins.kafka.KafkaEventsMetrics;

@Singleton
class KafkaEventSubscriberMetrics extends KafkaEventsMetrics {

  private static final String SUBSCRIBER_POLL_FAILURE_COUNTER =
      "subscriber_msg_consumer_poll_failure_counter";
  private static final String SUBSCRIBER_FAILURE_COUNTER =
      "subscriber_msg_consumer_failure_counter";

  private final Counter1<String> subscriberPollFailureCounter;
  private final Counter1<String> subscriberFailureCounter;

  @Inject
  public KafkaEventSubscriberMetrics(MetricMaker metricMaker) {
    this.subscriberPollFailureCounter =
        metricMaker.newCounter(
            "kafka/subscriber/subscriber_message_consumer_poll_failure_counter",
            new Description("Number of failed attempts to poll messages by the subscriber")
                .setRate()
                .setUnit("errors"),
            stringField(
                SUBSCRIBER_POLL_FAILURE_COUNTER, "Subscriber failed to poll messages count"));
    this.subscriberFailureCounter =
        metricMaker.newCounter(
            "kafka/subscriber/subscriber_message_consumer_failure_counter",
            new Description("Number of messages failed to consume by the subscriber consumer")
                .setRate()
                .setUnit("errors"),
            stringField(SUBSCRIBER_FAILURE_COUNTER, "Subscriber failed to consume messages count"));
  }

  public void incrementSubscriberFailedToPollMessages() {
    subscriberPollFailureCounter.increment(SUBSCRIBER_POLL_FAILURE_COUNTER);
  }

  public void incrementSubscriberFailedToConsumeMessage() {
    subscriberFailureCounter.increment(SUBSCRIBER_FAILURE_COUNTER);
  }
}