Heroku databases and tools outages

This was the email our team received:

Our monitoring app has been unable to reach your database (name) since at 2018-05-31 21:57:34 UTC. This is likely due to an underlying hardware or network failure and not something caused by your application.

We're attempting to bring it back online automatically. If we can't, we'll page an engineer to help.

When your database is available again, performance may be temporarily reduced while Postgres rebuilds its cache through normal usage.