Can I monitor Seafile logs within 3rd party app

I wonder whether it is possible to monitor the system logs withing a third party app (logstash and kibana or using grafana etc…).
and furthermore, is it possible to set up custom notifications as a result of certain logs? (5 unsuccessful login attempts for example)

Seafile writes the logs by default in the logs folder in the installation path. You can do with it what you want.

If you want to protect your system against brute-force attacks, I would advise to use fail2ban. There is a detailled description on how to set it up in the Seafile manual.