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## Problem We need a higher concurrency during reconfiguration in case of many DBs, but the instance is already running and used by the client. We can easily get out of `max_connections` limit, and the current code won't handle that. ## Summary of changes Default to 1, but also allow control plane to override this value for specific projects. It's also recommended to bump `superuser_reserved_connections` += `reconfigure_concurrency` for such projects to ensure that we always have enough spare connections for reconfiguration process to succeed. Quick workaround for neondatabase/cloud#17846