Monitis is by far one of the best monitoring programs that I've seen in a very long time. It's compatible with most latest PHP versions we have tested on PHP 5.6 - 7.0. The addon responds quickly plus they have a great support team to assist with any issues. If you are looking to provide your customers with clear and clean monitoring service then Monitis is defiantly the way to go. We have included it with not only our hosting customers we have deployed it along with our VPS and Dedicated Server customers as well.
Time used: Less than 6 months