mark the batchprocessor as deprecated

[codeboten]

This continues the work to deprecate the batch processor in favour of the exporter helper's batching capabilities.

Part of #12022

[atoulme]

LGTM - no joke, it has been coming for a while

[codeboten]

LGTM - no joke, it has been coming for a while

The date it was opened on is unfortunate

[songy23]

cc @open-telemetry/collector-approvers

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.22%. Comparing base (01b07fc) to head (36e5fb3).
⚠️ Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15046      +/-   ##
==========================================
- Coverage   91.22%   91.22%   -0.01%     
==========================================
  Files         697      697              
  Lines       44627    44629       +2     
==========================================
+ Hits        40710    40711       +1     
- Misses       2773     2775       +2     
+ Partials     1144     1143       -1     

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[codeboten]

note i'm not putting in the changelog to avoid merging this until we have enough approvals

[andrzej-stencel]

I don't think we should deprecate it. The processor (or its v2 version if implemented) is still useful in some specific scenarios.

I propose we instead implement the fixes and also change the docs to explain that the exporter helper should be used in most scenarios, describing the use cases for this component (or rather of the new better version of it).

If we actually implement the improvements on the processor as some kind of a v2 version, then v1 could be deprecated.

[jmacd]

I volunteered myself to write an RFC to describe the difficult transition problem we're facing here. I have not seen the proposal to support major-versioning of components referred to in #13583 (comment), but it sounds like a potential solution.

[jmacd]

See #15047