Support remote write 2.0 on receive #8033
Draft
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Changes
Porting remote write 2.0 into receive.
A lot of the handler code is duplicated, but given that at some point, remote write 1.0 will be deprecated, might make sense to keep them separate.
Added some initial tests
Lots of code inspired by prometheus/client_golang#1658 or prometheus upstream
TODOs:
Feel free to review and add your thoughts! :)
Fixes #7935 (but is blocked on native histogram downsampling)
Verification