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## Problem The metrics we have today aren't convenient for planning around the impact of timeline archival on costs. Closes: https://github.com/neondatabase/neon/issues/8108 ## Summary of changes - Add metric `pageserver_archive_size`, which indicates the logical bytes of data which we would expect to write into an archived branch. - Add metric `pageserver_pitr_history_size`, which indicates the distance between last_record_lsn and the PITR cutoff. These metrics are somewhat temporary: when we implement #8088 and associated consumption metric changes, these will reach a final form. For now, an "archived" branch is just any branch outside of its parent's PITR window: later, archival will become an explicit state (which will _usually_ correspond to falling outside the parent's PITR window). The overall volume of timeline metrics is something to watch, but we are removing many more in https://github.com/neondatabase/neon/pull/8245 than this PR is adding.