chore: update analytics examples

[markphelps]

• adds a readme for prometheus example
• fixed prometheus docker compose

closes: #3662

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.28%. Comparing base (be26774) to head (28ee67b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3660   +/-   ##
=======================================
  Coverage   64.28%   64.28%           
=======================================
  Files         170      170           
  Lines       17025    17025           
=======================================
  Hits        10945    10945           
  Misses       5398     5398           
  Partials      682      682           

Flag	Coverage Δ
unittests	64.28% <ø> (ø)

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