add basic info metrics to spin-operator

[rajatjindal]

These metrics are going to be a starting point for setting up dashboards for spin app (as per #16 )

[github-actions]

This PR now has an image available for testing:

  ttl.sh/spoopy-operator-pr-113:24h

[rajatjindal]

Hi @endocrimes @calebschoepp - I think I have addressed all the feedback and guess this is ready for final set of review. thanks.

[endocrimes]

I'm not convinced that this is the right way to do this style of metric (or that "info" metrics in general are something we want) - these will emit any time an app changes or at a full 10h resync, which means folks need to be pretty careful about how they use them, to a degree that I think might make them more confusing than helpful.

If all you want is a way to populate dropdowns, most dashboard building software will give you ways to do it based on more active metrics.

[rajatjindal]

This is a gauge, so my understanding is that it will remain available irrespective of the (re) sync time.

If that is indeed the case, do you have any other concerns?