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@grobinson-grafana grobinson-grafana commented Nov 25, 2025

What this PR does / why we need it:

This pull request adds a prepare downscale handler so dataobj-consumers remove their ownership of partitions when we downscale. This allows partitions to be cleaned up in the ring.

Which issue(s) this PR fixes:
Fixes #

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  • 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.
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@grobinson-grafana grobinson-grafana requested a review from a team as a code owner November 25, 2025 13:03
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This PR is stacked on top of #20006.

// immediately before the pod is downscaled. It can stop a downscale by
// responding with a non 2xx status code.
func (s *Service) PrepareDownscaleHandler(w http.ResponseWriter, r *http.Request) {
s.partitionInstanceLifecycler.SetRemoveOwnerOnShutdown(true)
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Copied from ingesters.

@grobinson-grafana grobinson-grafana force-pushed the grobinson/add-prepare-downscale-handler branch 2 times, most recently from 9daa1cb to f7d0923 Compare November 25, 2025 14:22
@grobinson-grafana grobinson-grafana force-pushed the grobinson/add-prepare-downscale-handler branch from f7d0923 to 7eb3d91 Compare November 26, 2025 11:11
@pull-request-size pull-request-size bot added size/S and removed size/L labels Nov 26, 2025
@grobinson-grafana grobinson-grafana merged commit 677b2ec into main Nov 26, 2025
72 checks passed
@grobinson-grafana grobinson-grafana deleted the grobinson/add-prepare-downscale-handler branch November 26, 2025 11:23
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