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## Problem For billing, we'd like per-branch consumption metrics. Requires https://github.com/neondatabase/neon/pull/11984. Resolves https://github.com/neondatabase/cloud/issues/28155. ## Summary of changes This patch adds two new consumption metrics: * `written_size_since_parent`: `written_size - ancestor_lsn` * `pitr_history_size_since_parent`: `written_size - max(pitr_cutoff, ancestor_lsn)` Note that `pitr_history_size_since_parent` will not be emitted until the PITR cutoff has been computed, and may or may not increase ~immediately when a user increases their PITR window (depending on how much history we have available and whether the tenant is restarted/migrated).