Docker health checks

[CraigBurden]

I would be really great to implement some ways of implementing healthchecks for docker to improve monitoring and error correction.

I had an issue recently where the background worker stalled for some reason and my instance accumulated ~10k pending tasks, but the worker container was still running. Restarting the container fixed the issue.

Perhaps adding some basic status checking CLI tools which can then be used as healthchecks would be useful?

[SchrodingersGat]

I've created an issue to track this in #12123

Would you be in a position to contribute such an improvement?

[CraigBurden]

Fantastic!

I have zero context into how the codebase works honestly, but if there is some developer documentation around the CLI and how if at all each service tracks status I've be happy to take a stab at it!

[getpwnam]

@CraigBurden - I've also been having a think about this.
I've created this PR with some settings that have been working for me - #12124
Would welcome your comments - I'm by no means a Docker expert!