This milestone is mostly about merging the new native histograms (AKA sparse histograms AKA high-res histograms) into the main branch of this repository, and only after that about declaring native histograms a stable feature. Therefore, the priorities have a slightly different meaning (because the issues do not affect the released versions before we merge to the main branch):

• P0: The sparsehistogram branch is outright broken until this is fixed.
• P1: We must fix this before merging to main.
• P2: We can merge to main without this but we need to fix this to declare Histograms stable.
• P3: Nice to have. Can be introduced later without a breaking change.
• P4: The future! Do not focus on this for now.

Note that the main work happens in https://github.com/prometheus/prometheus where the work is also tracked in a milestone.