Query Frontend: add new field for dense native histogram format #6199
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What this PR does:
#6151 added support for Ruler to evaluate rules via sending gRPC requests to Query Frontend.
An issue we found out is that the current JSON format query response from Query Frontend doesn't allow Ruler to access the whole information of native histograms. As what Prometheus returns in its Query response is a more compact format of native histogram, not its full format.
With another in progress PR #5527, we can make it possible to return protobuf query response in Query Frontend through Querier. This could make it possible for Ruler to get the full representation of native histograms.
This PR adds a new
rawHistogramsfield to Query Frontend protobuf. This field should never be set when using JSON codec and should be only used when using Protobuf codec asked by Ruler.Marked as WIP to wait for #5527 to be merged first.
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]