At least for kibana-oss 7.4, this is how I can access Kibana logs.
The file `/var/log/kibana` is not created and if I set it as a log file, kibana does not have permission to write there.
See also:
https://github.com/elastic/kibana/issues/6579
This overhaul of the docs structure puts Kibana's documentation more
inline with the structure that is used in Elasticsearch. This will help
us better organize the docs going forward as more docs are added.
This also includes a few necessary content changes for 5.0.