syslog input should allow parsing of custom tags

[vjsamuel]

Currently we dont have support for parsing custom tags for a template like so:

$template FooFormat, "<%pri%>%timestamp% %HOSTNAME% %syslogtag% [sherlock@8384 id=\"<some id>\" namespace=\"<some namespace>\" appname=\"some app\"] %msg%"\n

It would be great if we are able to extract: id, namespace and appname and add them to the syslog MapStr

The only alternative today is to use dissect

[botelastic]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[botelastic]

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