I have just switched from dump1090-mutability to dump1090-fa V3.5.
dump1090-mutability logs used to be at /var/log, however dump1090-fa does not seem to write any logs there.
Is there any way to write logs from dump1090-fa in the same manner as mutability used to have?
dump1090-fa writes via systemd/journald to syslog; with the default configuration that will end up in /var/log/syslog
You can tweak your syslog configuration to put it somewhere else if you want, but it does not log much.