In anticipation of the scheduled retirement (by AWS) of several EC2 instances hosting Aptible resources, we will be replacing several impacted NAT instances, database containers, and app containers on Wednesday 5/22 between 22:00 and 23:59 UTC.
For any stack that did not already have multiple outbound IP addresses, an additional outbound IP has been added. The new outbound IP address will be used during the NAT replacement process for impacted stacks to ensure that there is not any downtime. Please update any location where you have the current outbound IP of your stacks whitelisted to include the additional outbound IP addresses for your stacks. You can find instructions for locating the outbound IP addresses for your dedicated stack here: https://www.aptible.com/documentation/enclave/reference/stacks/outbound-ips.html#determining-an-app-s-outbound-ip-address
Any databases on an instance that is being replaced may be unavailable for 60-90 seconds during this maintenance window. We will be reaching out to customers with impacted databases in the next 24 hours.
Any apps on an instance that is being replaced will be restarted with a zero-downtime `aptible restart` operation.