As far as I can tell, since at least dc0dd6b321131bef34ead0f6f0c5606458dba2f2, the ModelMappers.toAlarm call isn't setting the AlarmType on the ImmutableAlarm.

This makes things like the JEXL expression I suggested using with the PagerDuty plugin not work, because type ends up always null there.

Looks like a one line change to fix this; let me know what branch you want me to target for the PR. Looks like this issue is present since Horizion 25.0.0, meridian-foundation 2019.1.0.