[slyall]

You could probably also use fluentd to do the same thing. It can process the logs locally and sent alerts instead of forwarding logs to a central source.

How to grep the logs for errors and send an email

https://docs.fluentd.org/how-to-guides/splunk-like-grep-and-...

The slack plugin you could use instead of email:

https://github.com/sowawa/fluent-plugin-slack