Identify one chronic condition that would benefit from regular self-monitoring of one or more of these vital signs? What would an individual with that condition monitor and why would they do so?

Heart disease

Explanation:

that person would need monitoring because, it is a key to better healthcare. Continuous heart monitoring gives your doctor important information about your health that can help with diagnosis and treatment of underlying heart conditions. That patient  would need to monitor it's heartbeat regularly why? if not the heart can stop in a matter of seconds.  

the answer to your question is (pancreas).