Include previous/next lines when using "if content"

[bablex]

e.g. grep has the -A/B/C flag to include x lines before/after/both a match.
It would be nice if there was a similar option in monit, so optionally we could include the previous/next x lines of a match.

I am not sure how the syntax should look like, maybe “then alert B5” or something?

e.g. for:

check file somelog with path /var/log/somelog
    if content "blabla" then alert

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