The postmortem for this incident has been posted to ROS Discourse here
Posted Jun 04, 2021 - 21:42 UTC
Resolved
Open Robotics infrastructure has been updated throughout to use the republished key and we're not currently aware of any further impacts to existing services.
We have extended the GPG expiration and are in the process of deploying it to the various systems. Our deployment is in process. We expect that there will be a requirement for users to update their systems, more information will be forthcoming.
Posted May 29, 2021 - 06:59 UTC
Investigating
The GPG key for packages.ros.org term has expired.