[title]
Demo check written in Python to evaluate available free memory.

[description]
This is a demo program that educates to program checks in Python language. In this demo, we evaluate available free memory for a low memory threshold.

[param low_mem_threshold]
Specifies low memory threshold value for this check. Available free memory in your Linux instance is compared against it.

[param high_mem_threshold]
Specified high memory threshold value for this check. Available free memory in your Linux instance is compared against it.
