ingest-storage: Do not deduplicate metadata by family name when unmarshalling #12804
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pracucci
approved these changes
Sep 25, 2025
| // SkipDeduplicateMetadata skips deduplication of RW2 metadata by metric family name. | ||
| // Normally this is done because RW2 requests to repeat metadata as it's embedded in timeseries. | ||
| // Some applications, like RW1->RW2 translation, might choose to disable it. | ||
| // Has no effect on marshalled or existing strucs; must be set prior to Unmarshal calls. |
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[nit]
Suggested change
| // Has no effect on marshalled or existing strucs; must be set prior to Unmarshal calls. | |
| // Has no effect on marshalled or existing structs; must be set prior to Unmarshal calls. |
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What this PR does
This PR builds on the refactor in #12792.
By default, RW2 deserialization deduplicates metric metadata by family name. All metadata beyond the first instance for a given family are discarded. This PR adds a new deserialization option, called
SkipDeduplicateMetadata, plus a newmetadataSetimplementation that avoids the deduplication and preserves all given metadata and ordering.This is done so that we can preserve metadata to the letter, even if it conflicts, ensuring we adhere to prometheus behavior particularly in RW1.0.
RW1 requests don't have the duplication that natural RW2 requests tend to have. Natural RW2 requests will already be deduplicated in the distributor before they reach the ingest-storage layer, so this change does not add undue duplication for clients sending RW2.0 into Mimir.
Which issue(s) this PR fixes or relates to
contrib https://github.com/grafana/mimir-squad/issues/2253
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]. If changelog entry is not needed, please add thechangelog-not-neededlabel to the PR.about-versioning.mdupdated with experimental features.