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ref https://github.com/neondatabase/neon/issues/7443 ## Summary of changes This pull request adds a size estimator for aux files. Each timeline stores a cached `isize` for the estimated total size of aux files. It gets reset on basebackup, and gets updated for each aux file modification. TODO: print a warning when it exceeds the size. The size metrics is not accurate. Race between `on_basebackup` and other functions could create a negative basebackup size, but the chance is rare. Anyways, this does not impose any extra I/Os to the storage as everything is computed in-memory. The aux files are only stored on shard 0. As basebackups are only generated on shard 0, only shard 0 will report this metrics. --------- Signed-off-by: Alex Chi Z <chi@neon.tech>