Feature Requests Check dependancy

The one thing we keep missing (ServerAlive did this well) is check dependency.
For some servers we have to monitor several services, so being abe to make them dependent can prevent many notifications for the same thing.

Simple example which I hope clarifies :-)

A https check would be set as dependent on a ping.
If the ping is down, the https check does not need to be done, as it is unlikely to give a different result, and once ping is back, restart checking https.