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Configure your firewall to send all system messages to a syslog server (NPM or otherwise) or create a log filtering profile to send "PBF" type logs (subtype eq pbf) to a syslog server or NMS (snmp trap). Create a filter plan on your syslog/NMS server to alert when the message appears.
This is what we did to get PBF alerts. One for next hop down and one for up.