Stanislav Paskalev 73e8373337 Add %v, %u and %t parameters to "failover_validation_command" ...

These indicate:
 - the number of visible nodes sharing the current upstream
 - the number of nodes on the current upstream
 - the total number of nodes in the entire repmgr cluster.

This allows the failover_validation_command to be used to perform
more thorough validations, including cross-referencing external
cluster management state (e.g. if managed by kubernetes).

GitHub #651.

2020-09-17 15:48:12 +09:00

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