This may be related to an addon being rebuilt, but to be sure I wonder if anybody knows for sure what the happy_jennings container is.
I saw this in the Glances AddOn (trying to understand why I have issues with the Influxdb container - likely because of memory):
Looks like a container with an auto-generated name. Not sure if that’s just something created by Supervisor or not for normal operations, but running docker inspect happy_jennings will give you detailed info about the container.
docker inspect happy_jennings