Yes there are some checks created inside Observium.
I made two small checks for PSU and Fan.
You can find the two files here.
These files must be copied to your “~/local/share/check_mk/checks/” folder.
Then test if the check is working with “cmk --debug -vvI hostname” and look if something new is found. If yes you can continue with “cmk --debug -vvn hostname” to test the check function.