[Bro] Logging in multiple formats

[Jan Grashöfer]

Hi Carl,

> Is there a way to log in both formats easily similar to how Suricata can
> emit both JSON and other log types all at once?

once I ran into the same problem and wrote a small script that might
help: https://gist.github.com/J-Gras/f9f86828f9e9d9c0b8f0908bc3573bb0

It adds a filter to generate additional JSON logs for the configured log
streams.

Hope this helps,
Jan