added metrics diagram

Split based on feedback from here
https://repo1.dso.mil/platform-one/big-bang/bigbang/-/merge_requests/359

Click Here to see Doc to Review:
https://repo1.dso.mil/platform-one/big-bang/bigbang/-/blob/BBOI-522_metric_diagram/docs/understanding/metrics_data_flow_diagram.md

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• ebe403a2 - fixed markdown formatting

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requested review from @runyontr

requested review from @kenna81

mentioned in merge request !359 (closed)

Should you mention anything about PodMonitors for pods that don't have a service front end?

honestly I don't know why podmonitors exist. I've never used them and can't think of a use case where I'd ever want to use them as I can't think of a use case where you'd want a pod that doesn't have an inner cluster dns name.

I'm thinking of this as a something that helps people get a high level understanding of most relevant to the diagram prometheus operator concept, they can always google the official docs if they want to know more.

If a pod doesn't have a service front end there's nothing stopping a user from adding both a service + a service monitor. (So the diagram is still valid + 1 consistent/standard way of doing things can sometimes be better than knowing all the possible ways)

approved this merge request

LGTM.

approved this merge request

approved this merge request

merged

mentioned in commit 269f0fe1