Managed to make it work by installing the previous version which seems to be compatible with DL180 (I also installed the previous version of hp-snmp-agents to have snmp working):
apt-get remove hp-health hp-snmp-agents apt-get install hp-snmp-agents=10.0.0.1.23-21. hp-health=10.0.0.1.3-4. /etc/init.d/hp-snmp-agents restart /etc/init.d/hp-health restart
and then I locked the versions to avoid accidental update
apt-mark hold hp-health apt-mark hold hp-snmp-agents