Add bytes metrics to obsreport

[iblancasa]

Link to tracking issue

Fixes #13105

Testing

• Added new tests

Note the current approach introduces a breaking change... but I will be happy to implement in any other way if somebody provides a hint about how to avoid it.

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.32%. Comparing base (2e61528) to head (aa67b4e).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13151      +/-   ##
==========================================
- Coverage   91.48%   91.32%   -0.17%     
==========================================
  Files         506      508       +2     
  Lines       28557    28947     +390     
==========================================
+ Hits        26125    26435     +310     
- Misses       1917     1994      +77     
- Partials      515      518       +3     

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[iblancasa]

Oh, maybe it is already there #13032