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Zeebe Elasticsearch Exporter

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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH under
 * one or more contributor license agreements. See the NOTICE file distributed
 * with this work for additional information regarding copyright ownership.
 * Licensed under the Zeebe Community License 1.1. You may not use this file
 * except in compliance with the Zeebe Community License 1.1.
 */
package io.camunda.zeebe.exporter;

import io.prometheus.client.Counter;
import io.prometheus.client.Gauge;
import io.prometheus.client.Histogram;

public class ElasticsearchMetrics {
  private static final String NAMESPACE = "zeebe_elasticsearch_exporter";
  private static final String PARTITION_LABEL = "partition";

  private static final Histogram FLUSH_DURATION =
      Histogram.build()
          .namespace(NAMESPACE)
          .name("flush_duration_seconds")
          .help("Flush duration of bulk exporters in seconds")
          .labelNames(PARTITION_LABEL)
          .register();

  private static final Counter FAILED_FLUSH =
      Counter.build()
          .namespace(NAMESPACE)
          .name("failed_flush")
          .help("Number of failed flush operations")
          .labelNames(PARTITION_LABEL)
          .register();

  private static final Histogram BULK_SIZE =
      Histogram.build()
          .namespace(NAMESPACE)
          .name("bulk_size")
          .help("Exporter bulk size")
          .buckets(10, 100, 1_000, 10_000, 100_000)
          .labelNames(PARTITION_LABEL)
          .register();

  private static final Gauge BULK_MEMORY_SIZE =
      Gauge.build()
          .namespace(NAMESPACE)
          .name("bulk_memory_size")
          .help("Exporter bulk memory size")
          .labelNames(PARTITION_LABEL)
          .register();

  private final String partitionIdLabel;

  public ElasticsearchMetrics(final int partitionId) {
    partitionIdLabel = String.valueOf(partitionId);
  }

  public Histogram.Timer measureFlushDuration() {
    return FLUSH_DURATION.labels(partitionIdLabel).startTimer();
  }

  public void recordBulkSize(final int bulkSize) {
    BULK_SIZE.labels(partitionIdLabel).observe(bulkSize);
  }

  public void recordBulkMemorySize(final int bulkMemorySize) {
    BULK_MEMORY_SIZE.labels(partitionIdLabel).set(bulkMemorySize);
  }

  public void recordFailedFlush() {
    FAILED_FLUSH.labels(partitionIdLabel).inc();
  }
}