I'm checking current docker template:

https://git.zabbix.com/projects/ZBX/repos/zabbix/raw/templates/app/docker/template_app_docker.xml?at=357c67e2b9773382a8f77d8aaa4d389c064d721a

I think it's crucial to have a metric which shows if the container starts using swap space.

If I'm not mistaken, this information is represented:

grep ^VmSwap /proc/<pid>/status