Amazon's Simple Notification Service looks like a promising way to sent alerts when we notice a site going down. amazon 
Mock alerts sent to a topic including my son and myself. All configured from the aws web console.
In this example, you use a series of Node.js modules to publish messages from Amazon SNS to topic endpoints, emails, or phone numbers. amazon github
In order to alert via sms we would configure a notification topic in the aws web interface, store aws account credentials in status/amazon.json, and, configure a wiki Datalog plugin with alert markup including the topic to be notified. Neither the aws account or alert phone numbers would be publicly visible.