We use the wonderful "who created that VM?" Alan Renouf script as well as several other custom annotations that we use for documentation purposes.
I created the tag categories for "CreatedBy" and "CreatedOn" and quickly realized that this does not seem like it would scale well.
Does a new tag really need to be created for each unique user/date that are currently stored in annotation field values?
Are tags not really designed for lots of unique per-VM information and serve a better purpose for large classification like OS type or owner?