WIP: Metrics: Re-enable metrics removed in prometheus/client_golang 1.12.2 #2822
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What this PR does
~80 runtime metrics were removed in prometheus/client_golang 1.12.2. This PR re-adds them, as suggested by @dannykopping and discussed in Slack.
NB: It's still being discussed whether these metrics should be re-enabled or not.
Which issue(s) this PR fixes or relates to
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]