Add metrics for prometheus observability

[daniel-heppner-ibigroup]

Checklist

• Appropriate branch selected (all PRs must first be merged to dev before they can be merged to master)
• Any modified or new methods or classes have helpful JavaDoc and code is thoroughly commented
• The description lists all applicable issues this PR seeks to resolve
• The description lists any configuration setting(s) that differ from the default settings
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• e2e tests are all passing (remove this if not merging to master)

Description

I'm adding a /metrics endpoint and tracking a bunch of metrics with micrometer gauges and counters. We also get a bunch of JVM stats built in from micrometer.

note it's unauthenticated, so users will need to make sure to filter that url in their reverse proxy if they feel like the data contained is sensitive.

example of metrics here: https://gist.github.com/daniel-heppner-ibigroup/3efda5ac5238337727af09009d84b9a1

[daniel-heppner-ibigroup]

do we have a formatter?

[miles-grant-ibigroup]

Haven't had a chance to test it yet, but looks solid

[miles-grant-ibigroup]

Working great! I adore it

[binh-dam-ibigroup]

Please move secrets from server.yml to env.yml.

[binh-dam-ibigroup]

Nice, looking forward to use metrics