If an interface is in an up state when the DFM discovery is done you will be alerted when it goes down. or if someon put it in shut
This doesn't work for switch access ports though. I don't think there is an easy way to create a "new" group of ports where you will get an alert.
For an uplink you will be alerted when it goes down
For the CRC errors you will get an alert when the threshold for x crc per poll period is exceeded
Cheers,
Michel