I have setup both types of logfile monitoring. In client-local, I have:
log:/some/application/logfile.log:10240 ignore MARK linecount:/some/application/logfile.log timeouts:.*Session.Timeout.*
The *log* directive makes the Hobbit client parse a particular application log. The *linecount* directive is being used so that Hobbit graphs the number of "Session Timeout" errors in a particular application log.
My hobbit-clients.cfg includes this, for example:
LOG /some/application/logfile.log %.*Session.Timeout.* color=yellow LOG /some/application/logfile.log %.*Session.Error.* color=red
The above two entries allow me to get Hobbit alerts if there are any session timeouts in the log (yellow alert), or if there are any errors in the log (red alert).
Now, what I need, is the ability to set alerts based upon HOW MANY timeouts or errors are in the log. I'm thinking this regex should work (it does according to pcretest):
LOG /some/application/logfile.log %(.*Session.Timeout.*){10,} color=red
The above *should* set a red condition if there are 10 or more Session Timeouts in the log, or at least in the part of the log that Hobbit received.
My question is...does Hobbits logfile parsing perform the multi-line regex or single? If it applies the regex to the entire logfile, my regex should work. If it only tests each line individually, it will not.
Other thoughts on Hobbits log monitoring:
- I think it makes more sense for the the "linecount" to be in hobbit-clients.cfg instead of client-local.cfg
- Its sort of confusing that "linecount" does not require a % in front of a regex, like everything else in Hobbit does (at least according to the man pages)
- Why do we need client-local.cfg at all? Couldn't these directives all be done via hobbit-clients.cfg, and any clients that are using local instead of server-side config would then use client-local.cfg?
- If Hobbit indeed does parse line-by-line and such my regex would fail, perhaps linecount could have an additional parameters to set an alert if the linecount is exceeded, something like: linecount filename pattern <optional minimum yellow count> <optional minimum red count>