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## Problem Storage controller will proxy GETs to pageserver-like tenant/timeline paths through to the pageserver. Usually GET passthroughs make sense to go to shard 0, e.g. if you want to list timelines. But sometimes you really want to know about a particular shard, e.g. reading its cache state or similar. ## Summary of changes - Accept shard IDs as well as tenant IDs in the passthrough route - Refactor node lookup to take a shard ID and make the tenant ID case a layer on top of that. This is one more lock take-drop during these requests, but it's not particularly expensive and these requests shouldn't be terribly frequent This is not immediately used by anything, but will be there any time we want to e.g. do a pass-through query to check the warmth of a tenant cache on a particular shard or somesuch.