There is currently an incident, and database servers 11, 22 and 23 stopped responding. Instances using those servers are down. I apologize for the disruption. I'm trying to gather more information and will update as soon as I know more.
If you have a fediverse account, you can quote this note from your own instance. Search https://mastodon.social/users/mastohost/statuses/116120405745019000 on your instance and quote it. (Note that quoting is not supported in Mastodon.)
RE: https://mastodon.social/@mastohost/116120405745019000
To anyone who experienced downtime, and you know your instance is on 
@mastohost - bookmark their account in your browser for future downtimes.
They do good work, always keeping us in the loop 🦣💙