Merge prometheus output

[codebien]

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Why?

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (make lint) and all checks pass.
• I have run tests locally (make tests) and all tests pass.
• I have commented on my code, particularly in hard-to-understand areas.

Related PR(s)/Issue(s)

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
14 out of 15 committers have signed the CLA.

✅ jwcastillo
✅ javaducky
✅ codebien
✅ pkwarren
✅ olegbespalov
✅ arukiidou
✅ mstoykov
✅ mem
✅ dylanjpaulson
✅ brunocascio
✅ Sea-you
✅ ppcano
✅ obanby
✅ 7olstoy
❌ Dmitry Tolstoy

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