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feat: Introduce policy stream mapping #15982

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@DylanGuedes DylanGuedes commented Jan 28, 2025

What this PR does / why we need it:
Introduces the idea of policies to Loki, which are recognizable based on the given stream selectors.
This is an improved version of #15561 and built on top of #15875.

Which issue(s) this PR fixes:
Fixes #

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Checklist

  • Reviewed the CONTRIBUTING.md guide (required)
  • Documentation added
  • Tests updated
  • Title matches the required conventional commits format, see here
    • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
  • Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
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@DylanGuedes DylanGuedes changed the base branch from main to retention-as-label-when-discarding January 28, 2025 14:12
@DylanGuedes DylanGuedes force-pushed the add-stream-mapping-to-loki branch from 87272ca to 243f34e Compare January 28, 2025 16:09
@github-actions github-actions bot added the type/docs Issues related to technical documentation; the Docs Squad uses this label across many repositories label Jan 28, 2025
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github-actions bot commented Jan 28, 2025

Base automatically changed from retention-as-label-when-discarding to main January 29, 2025 12:53
@DylanGuedes DylanGuedes marked this pull request as ready for review January 29, 2025 18:45
@DylanGuedes DylanGuedes requested a review from a team as a code owner January 29, 2025 18:45
@@ -3927,6 +3927,9 @@ otlp_config:
# CLI flag: -validation.enforced-labels
[enforced_labels: <list of strings> | default = []]

# Map of policies to stream selectors with a priority. Experimental.
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Is there a default for this setting? (even if the default is nothing is set?)
Also, this could use an example in the description, since users might not know what a mapping should look like.

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No, default means no mapping and no policies assigned.
But good call, I'll improve the docs of this struct.

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