Prometheus Monitoring

Metrics and Alerts

MinIO leverages Prometheus for metrics and alerts. Prometheus is an Open-Source systems and service monitoring system which supports analyzing and alerting based on collected metrics. The Prometheus ecosystem includes multiple integrations, allowing wide latitude in processing and storing collected metrics.

  • MinIO publishes Prometheus-compatible scraping endpoints for cluster and node-level metrics. See Metrics for more information.

  • For alerts, use Prometheus Alerting Rules and the Alert Manager to trigger alerts based on collected metrics. See Alerts for more information.

MinIO publishes collected metrics data using Prometheus-compatible data structures. Any Prometheus-compatible scraping software can ingest and process MinIO metrics for analysis, visualization, and alerting.


MinIO publishes all minio server operations to the system console. MinIO also supports publishing server logs and audit logs to an HTTP webhook.

  • Server logs contain the same minio server operations logged to the system console. Server logs support general monitoring and troubleshooting of operations.

  • Audit logs are more granular descriptions of each operation on the MinIO deployment. Audit logging supports security standards and regulations which require detailed tracking of operations.

MinIO publishes logs as a JSON document as a PUT request to each configured endpoint. The endpoint server is responsible for processing each JSON document. MinIO requires explicit configuration of each webhook endpoint and does not publish logs to a webhook by default.

See Publish Server or Audit Logs to an External Service for more complete documentation.


MinIO exposes unauthenticated endpoints for probing node uptime and cluster high availability for simple healthchecks. These endpoints return only an HTTP status code. See Healthcheck API for more information.