It's great to see so many useful features rolling out with each update to ArcGIS Online (hello Recyle Bin). However, I do have a bone to pick with the way updates occur. Each time an update is scheduled, there is always apprehension around what I'll need to fix when I get into work the following day. This time was no different. Yet again, I was presented with a new issue - all our offline maps no longer working offline. In this case, it was because of a tightening of the rules around which fields are required for a layer to be considered offline compatible (regardless of if it is editable or not). I had to go through all our maps in Field Maps Designer, open each hsoted view with an error and update the defined fields to include not just the Editor and Edit Date fields (previously required on editable layers only), but also select the Creator and Creation Date fields and to do this on all layers present (regardless of editability status).
IDEA: Prior to implementing an ArcGIS Online update, notifiy admins of changes that may impact the functionality of products hosted in the environment. This would enable us to implement updates ahead of time so that there is no downtime for users and unexpected emergency repair works throwing other works programs on the back burner.
This is particularly prudent due to the mandatory nature of ArcGIS Online updates (no ability to opt-out/delay like you can with ArcGIS Pro).
