Prometheus

Prometheus is the default, zero-dependency way to consume Klag metrics.

Enable

docker run -e KAFKA_BOOTSTRAP_SERVERS=kafka:9092 \
           -e METRICS_REPORTER=prometheus \
           -p 8888:8888 \
           themoah/klag:latest

Metrics are then served at http://localhost:8888/metrics in Prometheus text format.

Scrape config

scrape_configs:
  - job_name: klag
    metrics_path: /metrics
    static_configs:
      - targets: ['klag:8888']

On Kubernetes, the Helm chart can render a ServiceMonitor for the Prometheus Operator. See the chart’s values.yaml.

What you get

All metrics are exposed with consumer_group, topic, and partition labels where applicable. Import the Grafana dashboard for ready-made panels.