Resource creation date, and creator.
There are two missing bits of metadata that I would expect to see on every resource: the creation date and the name of who deployed it. Auditing is much harder without these.
These should automatically be added at resource creation, either on the Overview panel, or as tags in addition to the fifteen currently possible. Please add these as you cannot always rely on a user to add them, or when they do: to add them accurately.
I attempted to create policies to assign these at creation, but policies do not, at the time of writing, support functions / variables.
Olav Rønnestad Birkeland commented
1+ on this.
We're tried creating a Azure Policy to enforce naming convention on Resource Groups, but only when created by users and not Azure itself due to the fact that it would break automated functionality like Azure Backup. Turnes out it's not possible without the information asked for in this idea right here.