The commit refactors the shell scripts for checking disk, load and memory usage. The changes include updating the usage instructions and options for each script. The new options allow users to set warning and critical levels for each check.
Added three new scripts to check the status of disk usage, system load and memory usage. Each script takes in options for warning and critical levels, as well as an option to choose which average to use for the load level. The output includes information on used, available and total space/usage along with percentage values.