[Observium] alert checker based on a specific mib value?

Hi,

I am trying the enterprise observium version now for the alert checkers. I understand that we could add checkers based on existing conditions and metics listed on http://www.observium.org/wiki/Alerting_Metrics_and_Attributes

But say, if I want to alert on another mib value not listed here, is there currently a way to do so?

for instance, I have this mib listed under mibs/PAN-MIB-MODULES panSessionActive OBJECT-TYPE SYNTAX Integer32 MAX-ACCESS read-only STATUS current DESCRIPTION "Total number of active sessions." ::= { panSession 3 }

Can I add an alert checker to put condition as panSessionActive gt 100000 ?

I tried, but seems not able to. Is there a special way to do so?

Thanks a lot.

—Zhenhui Liang