[Observium] Simple service checks?

Hi All

Very new to observium, so please forgive me if this is a silly question :-)

In order to migrate away from nagios we also want to be able to track non-snmp values. For example;

- Response time of web sites (is response correct, if so report response time)

- SSL Certificate (is cert ok, if so report number of days left)

… and similar

Very easily scriptable checks, I just can’t work out what to do with them.

Ideally I’d like to create a device that doesn’t respond to SNMP checks but gets data from a local script.

Is this achievable or am I completely misusing Observium? Simply trying to get everything monitoring from one place :-)

Mark