[otelcol] Tell all loggers to encode timestamps in ISO8601.

[igorpeshansky]

Description

OTel collector log messages in Windows are currently displayed in scientific notation, e.g.:

1.7194132367192364e+09  error   scraperhelper/scrapercontroller.go:197  Error scraping metrics  …

This fix will cause the log messages to use ISO8601 timestamps instead.

Testing

Manual testing.

Documentation

The previous behavior was undocumented, so no documentation changes needed.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[github-actions]

Closed as inactive. Feel free to reopen if this PR is still being worked on.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.69%. Comparing base (c8a932e) to head (0ef9b0f).
Report is 226 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10543   +/-   ##
=======================================
  Coverage   91.69%   91.69%           
=======================================
  Files         411      411           
  Lines       19294    19296    +2     
=======================================
+ Hits        17692    17694    +2     
  Misses       1241     1241           
  Partials      361      361           

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[djaglowski]

LGTM. Please add a changelog entry. IMO this is best documented as a breaking change since it may affect users who are consuming the collector's logs.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[igorpeshansky]

Sorry, still planning to work on this.