[Observium] Monitoring job status

Hi, is there a way within Observium to monitor a file system to check that a new file appears at a given time, or alternatively to monitor a log for an entry to appear?

The idea is, there are some scheduled tasks running on a Linux server. We can have each task do something on completion, like write a file somewhere, write to a log, post to a database, etc. We want to see if Observium can watch for something like that and alert if it doesn't occur.

Method is completely undecided at this point so any ideas are much appreciated.

Thanks,