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feat(multigres): add the multigres_probe role to the image - #2638
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Create multigres_probe in the Multigres init manifest, next to the postgres role: LOGIN, NOBYPASSRLS, CONNECTION LIMIT 2, statement_timeout 2s, no password and no grants. Multigres uses it to check that a cluster can answer a query over the normal client path; multipooler grants it read access to multigres.heartbeat and nothing else. Reserve the name in supautils.reserved_roles for both Multigres variants so non-superuser roles cannot drop, alter or take it over. Only the Multigres images get it, so it is not added to the shared init-scripts.
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Create multigres_probe in the Multigres init manifest, next to the postgres role: LOGIN, NOBYPASSRLS, CONNECTION LIMIT 2, statement_timeout 2s, no password and no grants. Multigres uses it to check that a cluster can answer a query over the normal client path; multipooler grants it read access to multigres.heartbeat and nothing else.
Reserve the name in supautils.reserved_roles for both Multigres variants so non-superuser roles cannot drop, alter or take it over. Only the Multigres images get it, so it is not added to the shared init-scripts.