In the ignition.conf file, there lists a line of
wrapper.logfile.format=LPTM
Where does one find this doc of formats? What are allowed values? Looking to see if one can get a .json version of the log file.
Note that that's already happening "after" regular log output, once it hits stdout of the Ignition process and is sent to the wrapper log by the service wrapper.
The actual configuration you want to mess with to get more useful log output is the logback.xml file. There's some good discussion on that file and sending it to different log collectors here on the forum.
I tend to set mine to:
wrapper.console.format=M
Milliseconds is handy. The rest is noise.