Add Docker healthcheck

[GregJohnStewart]

The dockerfile should supoprt docker's healthcheck functionality, for easier deployment management.

The hardest part would be what command to run in ghte container to determine the health starus of the system, given the number of individual parts and configurability (obi/non, example)

https://docs.docker.com/reference/dockerfile/#healthcheck

[zeitlinger]

There's a readiness check (cat /tmp/ready) in the K8s manifest, but that only confirms initial startup — it doesn't verify components are still healthy.

A proper HEALTHCHECK should probe running services. The main health endpoints are:

• Grafana: http://localhost:3000/api/health
• Loki: http://localhost:3100/ready
• Tempo: http://localhost:3200/ready
• Mimir: http://localhost:9090/-/ready
• OTel Collector: http://localhost:13133/ (health_check extension)

Implementation idea:

• Add a healthcheck.sh script to the image that auto-detects which components are running (check if the port is listening) and curls their health endpoints. Fails if any running component is unhealthy.
• Add HEALTHCHECK CMD /healthcheck.sh to the Dockerfile — works out of the box for Docker users, no extra config needed.
• For K8s, users can reference the same script as a liveness probe: livenessProbe: exec: command: ["/healthcheck.sh"]

PRs welcome!

[Cookkiieess]

hi im interested in this issue. could you please assign it to me?

[martincostello]

Feel free to pick it up - your comment is sufficient to indicate a desire to work on this.

[GregJohnStewart]

Lemme know if assistance is needed, I've made these before, just don't have the cycles to contribute directly.

[martincostello]

This was implemented by #1105.