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This issue track work left to stabilize PROM-39 feature.
- flag and OM, prom (text+proto) parsing, PromQL engine support (feature: type-and-unit-labels (PROM-39 implementation) #16228)
- When performing rate() or increase() over series without the correct
__type__label, surface warnings to the user (PROM-39: Provide PromQL info annotations when rate()/increase() over series without__type__="counter" label #16632) - PromQL Annotation/warning when type or unit mismatch across series (Return info annotation when query returns metrics with same name but different type or unit label #16641)
- Idea: Middleware storage.Storage with storage.SeriesSet.Next that saves first seen type and unit and produce annotation when we see another.
- metric family switch bug for text formats
- Detection like this: https://github.com/prometheus/prometheus/blob/main/scrape/scrape.go#L1920
- Fix todos - PROM-39: Add tests for relabeling of type and unit labels #16738
- OTLP receive support (PROM-39: [new] Add type and unit labels to OTLP endpoint #16770)
- PRW (recv + send) support