What is down right now, read every minute from each service's own status feed, and what breaks with what when one of the four big clouds fails. Every line on the map is a documented outage: hover a provider for the date, the cause and the sources; tap a service for its official status page.
Dot colour is the service’s live state from its own feed: green normal, amber degraded, red outage, hollow = no feed. Dotted outlines are companies named in outage coverage that publish no status page. Not every service that went down is drawn; only the ones a cited source names.