Checks might run into problems parsing the output of an agent plugin. When this happens during a normal check, you will soon know this as the according service goes UNKNOWN and you will be able to create a crash dump.
cmk -I on the command line
Now for each files plugin a warning is being printed, but the discovery continues. --debug will let the Python exception come through and abort the discovery with a precise error message - just as it used to be.
Check_MK Discovery service
The discovery check now in case of an error during the discovery goes to UNKNOWN and produces a crash dump - just as normal checks do. That way you can easily send us a crash report in case of any error. Previously error would be ignored silently.
Service list in WATO
In WATO the list of a host's services will display a yellow error message if one of the plugins fails. This messages has a link for retrying the discovery without the error message and that way switch back to the old behaviours (temporarliy).
Bulk discovery in WATO
The bulk discovery keeps to the old behaviour of silently ignoring errors but has got a new checkbox for letting a host fail if at least one check plugin of the host runs into an error. The default setting of the checkbox is to ignore errors.