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## Problem When tenants have a lot of timelines, the number of tenants that a pageserver can comfortably handle goes down. Branching is much more widely used in practice now than it was when this code was written, and we generally run pageservers with a few thousand tenants (where each tenant has many timelines), rather than the 10k-20k we might have done historically. This should really be something configurable, or a more direct proxy for resource utilization (such as non-archived timeline count), but this change should be a low effort improvement. ## Summary of changes * Change the target shard count (MAX_SHARDS) to 2500 from 5000 when calculating pageserver utilization (i.e. a 200% overcommit now corresponds to 5000 shards, not 10000 shards) Co-authored-by: John Spray <john.spray@databricks.com>