Crowdsec and external servers/services

[Matzke]

Dear all,
I'm pretty new to crowdsec and have a little question.

I setup crowdsec on opnsense and I think it works as it should.

Now I have some internal servers which are connected via port-forwarding in opnsense to the internet (either port-forwarding or HAProxy reverse proxy on opnsense).

What do I need to collect and analyze the log files of these dedicated servers and report it to crowdsec running on my opnsense? The blocking-rules should also happens on opnsense because this is the gatekeeper to the internet.

Are there any manuals out there for this scenario?

Thanks a lot