Commits on Mar 30, 2023

1. kvserver: use qps for hot ranges sorting …

   We introduced CPU balancing by default in cockroachdb#97424. This had the side
   effect of changing the hot ranges api to return the hottest replicas by
   CPU, rather than QPS.
   
   This patch updates the replica rankings struct to support tracking both
   by CPU and QPS simultaneously. The hot ranges API collects the top k by
   QPS and the store rebalancer collects depending on the setting of
   `kv.allocator.load_based_rebalancing.objective`, which is by default
   `cpu`.
   
   Resolves: cockroachdb#99605
   
   Release note (bug fix): The hot ranges UI page would show hot ranges by
   CPU and not QPS, depending on the value of
   `kv.allocator.load_based_rebalancing.objective` (default `cpu`). Now the
   UI page will always collect based on QPS.

   

   kvoli committed Mar 30, 2023
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