[receiver/opencensus]: check for ErrListenerClosed when reporting multiplexer status

[odubajDT]

Fixes #33865

[crobert-1]

Two things:

1. This should probably have a changelog since it's a bug fix.
2. Is it possible to add a test for this? Maybe some way to make sure that shutting down isn't blocked in this specific case where the listener is closed?

[odubajDT]

Two things:

1. This should probably have a changelog since it's a bug fix.

2. Is it possible to add a test for this? Maybe some way to make sure that shutting down isn't blocked in this specific case where the listener is closed?

I will try, but still testing if the actual fix resolves the issue, since I am not 100% sure yet, the PR is still in draft mode and chlog + some unit tests are still missing -> will add them ass soon as the PR will be ready for review+merging.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.86%. Comparing base (e495816) to head (c4ed6b9).
Report is 28 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #34093      +/-   ##
==========================================
- Coverage   82.97%   82.86%   -0.12%     
==========================================
  Files        2131     2132       +1     
  Lines      156561   157389     +828     
==========================================
+ Hits       129911   130421     +510     
- Misses      21927    22225     +298     
- Partials     4723     4743      +20     

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[crobert-1]

This message should be a bit more user-friendly. What does the user of the opencensus receiver care about, and understand?

Maybe something like "Don't report an error for an expected condition during shutdown"?

[crobert-1]

Thanks for fixing this!