Document monitor archival idempotency requirement (#3276 followup)

[arik-so]

Followup to #3276, addressing #3122.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.89%. Comparing base (66fb520) to head (268675a). Report is 83 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3329      +/-   ##
==========================================
+ Coverage   89.66%   90.89%   +1.23%     
==========================================
  Files         126      127       +1     
  Lines      102676   115304   +12628     
  Branches   102676   115304   +12628     
==========================================
+ Hits        92062   104805   +12743     
+ Misses       7894     7861      -33     
+ Partials     2720     2638      -82     

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[TheBlueMatt]

Sure, feel free to squash.