14.3. "degraded monitoring" mode

In certain circumstances, repmgrd is not able to fulfill its primary mission of monitoring the node's upstream server. In these cases it enters "degraded monitoring" mode, where repmgrd remains active but is waiting for the situation to be resolved.

Situations where this happens are:

• a failover situation has occurred, no nodes in the primary node's location are visible
• a failover situation has occurred, but no promotion candidate is available
• a failover situation has occurred, but the promotion candidate could not be promoted
• a failover situation has occurred, but the node was unable to follow the new primary
• a failover situation has occurred, but no primary has become available
• a failover situation has occurred, but automatic failover is not enabled for the node
• repmgrd is monitoring the primary node, but it is not available (and no other node has been promoted as primary)

Example output in a situation where there is only one standby with failover=manual, and the primary node is unavailable (but is later restarted):

    [2017-08-29 10:59:19] [INFO] node "node2" (node ID: 2) monitoring upstream node "node1" (node ID: 1) in normal state (automatic failover disabled)
    [2017-08-29 10:59:33] [WARNING] unable to connect to upstream node "node1" (node ID: 1)
    [2017-08-29 10:59:33] [INFO] checking state of node 1, 1 of 5 attempts
    [2017-08-29 10:59:33] [INFO] sleeping 1 seconds until next reconnection attempt
    (...)
    [2017-08-29 10:59:37] [INFO] checking state of node 1, 5 of 5 attempts
    [2017-08-29 10:59:37] [WARNING] unable to reconnect to node 1 after 5 attempts
    [2017-08-29 10:59:37] [NOTICE] this node is not configured for automatic failover so will not be considered as promotion candidate
    [2017-08-29 10:59:37] [NOTICE] no other nodes are available as promotion candidate
    [2017-08-29 10:59:37] [HINT] use "repmgr standby promote" to manually promote this node
    [2017-08-29 10:59:37] [INFO] node "node2" (node ID: 2) monitoring upstream node "node1" (node ID: 1) in degraded state (automatic failover disabled)
    [2017-08-29 10:59:53] [INFO] node "node2" (node ID: 2) monitoring upstream node "node1" (node ID: 1) in degraded state (automatic failover disabled)
    [2017-08-29 11:00:45] [NOTICE] reconnected to upstream node 1 after 68 seconds, resuming monitoring
    [2017-08-29 11:00:57] [INFO] node "node2" (node ID: 2) monitoring upstream node "node1" (node ID: 1) in normal state (automatic failover disabled)

By default, repmgrd will continue in degraded monitoring mode indefinitely. However a timeout (in seconds) can be set with degraded_monitoring_timeout, after which repmgrd will terminate.