Yep. we do this too. Whenever we develop a web service for a customer, we set up uptime monitoring on the server where the app is hosted, but I also set up pin

Yep. we do this too. Whenever we develop a web service for a customer, we set up uptime monitoring on the server where the app is hosted, but I also set up ping uptime checks on most of their other server infrastructure as well. Just last week, I was alerted at 5am that a client's email server had gone offline. Nothing to do with us, we don't look after their emails at all, but I immediately texted their IT guy to let him know. He texted me back at 6am - their own uptime monitors somehow failed to detect the DNS issue. He managed to fix it before their staff got to work that morning, and was extremely grateful that I had given him advanced heads up on something that was totally outside the scope of what they had engaged us for.