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## Problem There's no metrics for disk consistent LSN and remote LSN. This stuff is useful when looking at ingest performance. ## Summary of changes Two per timeline metrics are added: `pageserver_disk_consistent_lsn` and `pageserver_projected_remote_consistent_lsn`. I went for the projected remote lsn instead of the visible one because that more closely matches remote storage write tput. Ideally we would have both, but these metrics are expensive.