[DEMO] Prometheus monitoring stack setup playbook

[jabellard]

What type of PR is this?

What this PR does / why we need it:
Code should not be merged. This is for a demo, and for anyone who wants to play around with the setup.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

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[jabellard]

I will use this branch for a demo during the next community meeting. Anyone is welcome to clone this branch and play with the setup as well.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.22%. Comparing base (f60f341) to head (17488b9).
⚠️ Report is 4 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6884      +/-   ##
==========================================
- Coverage   46.24%   46.22%   -0.03%     
==========================================
  Files         692      692              
  Lines       47194    47194              
==========================================
- Hits        21826    21816      -10     
- Misses      23715    23723       +8     
- Partials     1653     1655       +2     

Flag	Coverage Δ
unittests	46.22% <ø> (-0.03%)	⬇️

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