there are no crash logs, nor anyway to reliably create them.
ofc, you are welcome to have your own logs for you plugin, wherever you like, but it’ll be about your plugin.
basically, what synthor does ( I believe), and I do , is push some logging to kmsg, i.e. what you see with dmesg. ofc, nothing thats in the dsp path. mostly its initialisation stuff.
and no, its not user focused, its really only there for devs, that’ll ssh into the SSP and want to get some trace info.
(also generally, not a good idea to be writing to an sdcard continually… though infrequent logging would be fine - also bare in mind date/time is never correct on the ssp)
whilst the SSP is NOT an embedded system, from a user perspective, Id say its treated like one… its a black box, it works or doesn’t 
unlike a computer where users try to help diagnose problems etc, mainly because everyones computer setup is different - here all out boxes are the same.
perhaps an ideal goal, rather than reality, but I do think its the right approach…
most that buy musicial hardware (instruments) want it to ‘just work’,