Alerts extension followups

[robinst]

Some follow-ups for #420.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.57%. Comparing base (471e639) to head (6621065).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #423      +/-   ##
============================================
- Coverage     94.62%   94.57%   -0.05%     
- Complexity      333      374      +41     
============================================
  Files           144      150       +6     
  Lines          4875     5018     +143     
  Branches        701      720      +19     
============================================
+ Hits           4613     4746     +133     
- Misses          141      145       +4     
- Partials        121      127       +6     

see 6 files with indirect coverage changes

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