This host-level alert is triggered if the individual JournalNode process cannot be
established to be up and listening on the network for the configured critical threshold,
given in seconds. It uses the Nagios check_tcp
plugin.
The JournalNode process is down or not responding.
The JournalNode is not down but is not listening to the correct network port/address.
The Nagios server cannot connect to the JournalNode.