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Kirill Bulatov
ec3a3aed37
The PR adds an endpoint to show tenant's current config: `GET /v1/tenant/:tenant_id/config` Tenant's config consists of two parts: tenant overrides (could be changed via other management API requests) and the default part, substituting all missing overrides (constant, hardcoded in pageserver). The API returns the custom overrides and the final tenant config, after applying all the defaults. Along the way, it had to fix two things in the config: * allow to shorten the json version and omit all `null`'s (same as toml serializer behaves by default), and to understand such shortened format when deserialized. A unit test is added * fix a bug, when `PUT /v1/tenant/config` endpoint rewritten the local file with what had came in the request, but updating (not rewriting the old values) the in-memory state instead. That got uncovered during adjusting the e2e test and fixed to do the replacement everywhere, otherwise there's no way to revert existing overrides. Fixes #3471 (commit https://github.com/neondatabase/neon/commit/dc688affe8f9daa601fb4af700998bcd6f21ea57) * fixes https://github.com/neondatabase/neon/issues/3472 by reordering the config saving operations