"monitor vpn ipsec" is not showing any results as the calling script does not have correct matching parameters.
vyos@vyos# cat /opt/vyatta/share/vyatta-op/templates/monitor/vpn/ipsec/node.def help: Monitor IPSec VPN run: ${vyatta_bindir}/vyatta-monitor "VPN-IPSEC" pluto pptp l2tp ppp
vyos@vyos# cat /opt/vyatta/share/vyatta-op/templates/monitor/vpn/all/node.def help: Monitor VPN run: ${vyatta_bindir}/vyatta-monitor 'VPN-ALL' pluto pptp l2tp ppp