I'm trying to make sense of the default access-extractions transform so that I can modify it a bit. I've been nosing around splunk answers and the online Admin Manual. In particular, the "Use the Field transformations page in Manager" page.
Abbreviated version of the default access-extractions regex:
I see that nspaces is another transform, though I'm not sure what the :clientip means, for example. Basically I want to prepend some fields to the expression.
My syslog-ng log output is the same as the common apache access log, but with a few more fields at the start of each log line. When I simply clone the access-extractions transform, make no modifications except for changing the Name field, it kicks back "Please enter all required fields" indicating in red that Event Format is the required field. When I look at the default access-extractions transform (or any others) the Event Format field is empty, so it doesn't give me much to go on. Would those names (:client, :ident, :user, etc) be an indication that I need to do something like clientip::$1 ident::$2 user::$3 etc...?
Thanks in advance!
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