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Document that Prometheus exporter does not work with multiprocessing #4711

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bastbu
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@bastbu bastbu commented Aug 5, 2025 •
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Description

This PR adds a note to the documentation of the Prometheus exporter to make it clear that the exporter does not work when using multiprocessing.

Applies to #3747

Type of change

Please delete options that are not relevant.

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • This change requires a documentation update

How Has This Been Tested?

No tests - documentation update.

Does This PR Require a Contrib Repo Change?

  • Yes.
  • No.

Checklist:

  • Followed the style guidelines of this project
  • Changelogs have been updated
  • Unit tests have been added
  • Documentation has been updated

@bastbu bastbu marked this pull request as ready for review August 5, 2025 13:02
@bastbu bastbu requested a review from a team as a code owner August 5, 2025 13:02
@tammy-baylis-swi
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Thank you for this PR!

Could the warning also be added to the docs-level rst?: https://github.com/open-telemetry/opentelemetry-python/blob/cf31a6967aac76663b4cca023b5d760fd6eb5355/docs/exporter/prometheus/prometheus.rst

@bastbu
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bastbu commented Aug 7, 2025

Thank you for this PR!

Could the warning also be added to the docs-level rst?: https://github.com/open-telemetry/opentelemetry-python/blob/cf31a6967aac76663b4cca023b5d760fd6eb5355/docs/exporter/prometheus/prometheus.rst

Sure, added it in both places now.

tammy-baylis-swi
tammy-baylis-swi approved these changes Aug 7, 2025
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Thanks for that, I think this is good. The maintainers will be the next to look at this.

emdneto
emdneto reviewed Aug 11, 2025
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docs/exporter/prometheus/prometheus.rst Outdated
Limitations
-----------------

* No multiprocessing support: The Prometheus exporter is not designed to operate in multiprocessing environments.
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Can we point to the tracking issue? #3747

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Done with b1e15e8.

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@emdneto emdneto emdneto approved these changes

@tammy-baylis-swi tammy-baylis-swi tammy-baylis-swi approved these changes

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@bastbu @tammy-baylis-swi @emdneto