Last week, for the first time ever, we experienced an interruption in the hosted feature services of ArcGIS Online. Since we only found this out after colleagues started noticing strange behavior, I looked up the services status page of ArcGIS Online and added it to my bookmarks. It’s called ArcGIS Online Health Dashboard, and it’s located here: http://status.arcgis.com/.
Even more handy is the RSS to the same information: http://status.arcgis.com/rss/all.rss. You can add this to your favorite RSS reader, such as feedly or even in your Microsoft Outlook.
By the way, since we also use our own hosted services on Amazon, the same applies for the service status of Amazon Web Services: http://status.aws.amazon.com/ (RSS to Elastic Cloud Computing in Ireland region: http://status.aws.amazon.com/rss/ec2-eu-west-1.rss)