Set resource limits and requests for HA

[michaeldmitry]

Solution

A generic implementation for HA charms to provide resources_requests and a container_name to patch it with those k8s resource requests.

Context

• Setting limits portion would be a charm's config option (e.g: cpu_limits, memory_limits)
  • If the charm (e.g: tempo) have different config option names for cpu and memory limits, you can pass those names to the constructor's resources_limit_options.
• Setting requests portion would be hardcoded in the charm code.
  • Constructor's take a callable resources_requests and a container_name to get the dictionary of cpu and memory requests. The charm can pass a callable that sets dynamic requests values if needed.
• Setting unit status based on the outcome of the patch operation using Transform KubernetesComputeResourcesPatch "Push" statuses into "Pull" statuses observability-libs#107

[PietroPasotti]

I need a little bit more documentation/context to know what I'm reviewing

[PietroPasotti]

Some more thoughts

[PietroPasotti]

some things I missed in my previous review, sorry about that!

[PietroPasotti]

nice job!