[batchprocessor] Modernize the batch processor

[jmacd]

Description

Implements batchprocessor using exporterhelper features. Behind two feature flags:

• processor.batch.useExporterHelper: use the new logic, QueueBatch with BlockOnOverflow
• processor.batch.propagateErrors: use error propagation via WaitForResult

Currently, this emits metrics with incorrect names; the batch processor emits metrics like an exporter, see #14038.

Link to tracking issue

Fixes #13582 Part of #13766 Part of #14038

Testing

Yes.

For every existing test case (19 cases), the test is run once with the feature and once without the feature. For a few selected tests, the propagateErrors feature is also tested.

4 tests are disabled in the exporterhelper-based mode because of the incorrect metric names.

Documentation

✅

[github-actions[bot]]

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

[jmacd]

Blocked by #13478

[github-actions[bot]]

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

[codecov[bot]]

Codecov Report

:x: Patch coverage is 97.41379% with 3 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 91.63%. Comparing base (ba6cd70) to head (2174afc). :warning: Report is 103 commits behind head on main.

Files with missing lines	Patch %	Lines
processor/batchprocessor/config.go	25.00%	2 Missing and 1 partial :warning:

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #13583    +/-   ##
========================================
  Coverage   91.62%   91.63%            
========================================
  Files         655      656     +1     
  Lines       42729    42835   +106     
========================================
+ Hits        39151    39252   +101     
- Misses       2758     2761     +3     
- Partials      820      822     +2     

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[github-actions[bot]]

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

[github-actions[bot]]

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