Standby node will become active in 5 seconds when it detects that other node is stopped, so if there is 10 seconds delay between restart then everything works properly, however if node was stopped/started instantly then last node becomes active again, this is not optimal in case it is started/stopped continuously due to some error such as too many database connections.

Possible solution is that ha manager checks if it starts up and there are other standby node already running then sleep for 10 seconds (we do not want always to sleep for 10 seconds during startup as this will slowdown startup)