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feat(pageserver): integrate lsn lease into synthetic size (#8220)
Part of #7497, closes #8071. (accidentally closed #8208, reopened here) ## Problem After the changes in #8084, we need synthetic size to also account for leased LSNs so that users do not get free retention by running a small ephemeral endpoint for a long time. ## Summary of changes This PR integrates LSN leases into the synthetic size calculation. We model leases as read-only branches started at the leased LSN (except it does not have a timeline id). Other changes: - Add new unit tests testing whether a lease behaves like a read-only branch. - Change `/size_debug` response to include lease point in the SVG visualization. - Fix `/lsn_lease` HTTP API to do proper parsing for POST. Signed-off-by: Yuchen Liang <yuchen@neon.tech> Co-authored-by: Joonas Koivunen <joonas@neon.tech> Co-authored-by: Christian Schwarz <christian@neon.tech>
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