We are using a scale set for Service Fabric. We have a custom image deployed to our scale set using the 'latest' image version from a Shared Image Gallery. Per the documentation the VMs in the scale set should update to the latest version within 3hrs. On our scale set there is a message that says, "Automatic OS upgrades are not available for the image used by this scale set." but no information is given as to why this is the case. There's also no documentation on this message and I've triple checked all of the requirements and we meet them all.
If this is not going to work, then we can manually trigger the upgrades but I want to know which function to use that best fits our use case. OS Upgrade and Reimage seem to do the same thing, but I'm sure there are some differences. Can anyone clear this up for me?
