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## Problem Part of https://github.com/neondatabase/neon/issues/9516 ## Summary of changes This patch adds the support for storing reldir in the sparse keyspace. All logic are guarded with the `rel_size_v2_enabled` flag, so if it's set to false, the code path is exactly the same as what's currently in prod. Note that we did not persist the `rel_size_v2_enabled` flag and the logic around it will be implemented in the next patch. (i.e., what if we enabled it, restart the pageserver, and then it gets set to false? we should still read from v2 using the rel_size_v2_migration_status in the index_part). The persistence logic I'll implement in the next patch will disallow switching from v2->v1 via config item. I also refactored the metrics so that it can work with the new reldir store. However, this metric is not correctly computed for reldirs (see the comments) before. With the refactor, the value will be computed only when we have an initial value for the reldir size. The refactor keeps the incorrectness of the computation when there are more than 1 database. For the tests, we currently run all the tests with v2, and I'll set it to false and add some v2-specific tests before merging, probably also v1->v2 migration tests. --------- Signed-off-by: Alex Chi Z <chi@neon.tech>