Arvados

Docker metadata links for Docker image collections should include an image_timestamp property. This helps the API server with job reuse so that if an older image is uploaded after a newer one, it continues to use the newer image to resolve symbolic names, consider it during job reuse decisions, etc.

Recently, arv keep docker has been creating these links without the image_timestamp property. They're usually easy to spot with a query like arv link list --filters='[["link_class", "=", "docker_image_repo+tag"]]'. This is expected behavior if arv keep docker can't get an image's created timestamp from Docker, but we should investigate why this is happening and make the tool more robust in this situation. It's not a simple code regression; some recent links do have the timestamp. It's something more subtle, like an interaction with a specific Docker version or details about how the image was created.