Hi, sorry for not getting back to you earlier.
* simple e-mail alerting from syslog-ng
* you can also get daily emails, but that's probably difficult to get and overkill to do in syslog-ng (you need to use a pattern database to identify the related messages, and use message correlation and triggered actions), see https://www.balabit.com/documents/syslog-ng-ose-3.5-guides/en/syslog-ng-ose-guide-admin/html/chapter-patterndb.html
For using syslog-ng with splunk, there is a whitepaper for the commercial version of syslog-ng, but most of it applies to the open source version as well, so it might be interesting for you: https://www.balabit.com/documents/pdf/syslog-ng-pe-whitepaper-splunk.pdf
Regards,
Robert
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