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## Problem Currently, we leave `index_part.json` objects from old generations behind each time a pageserver restarts or a tenant is migrated. This doesn't break anything, but it's annoying when a tenant has been around for a long time and starts to accumulate 10s-100s of these. Partially implements: #7043 ## Summary of changes - Add a new `pageserver-physical-gc` command to `s3_scrubber` The name is a bit of a mouthful, but I think it makes sense: - GC is the accurate term for what we are doing here: removing data that takes up storage but can never be accessed. - "physical" is a necessary distinction from the "normal" GC that we do online in the pageserver, which operates at a higher level in terms of LSNs+layers, whereas this type of GC is purely about S3 objects. - "pageserver" makes clear that this command deals exclusively with pageserver data, not safekeeper.