Compaction is performed only by pageserver and only for L0 layers. But L0 layers can be offloaded to S3 and loaded back. So we actually perform compaction of S3

Compaction is performed only by pageserver and only for L0 layers. But L0 layers can be offloaded to S3 and loaded back. So we actually perform compaction of S3 layers (but we download them to the pageserver).