Hi Jen!
Usually we put the whole cat report, or a funny story about what they did that day or both. Sometimes we express our frustration or happiness.. whatever comes to mind. Definitely always need a wcr. In your case, a brief history of Milo would be a good start and also we always link our condo to the one from the day before so if something's going on we can quickly go back and read what happened yesterday.
Hug our boy for me! And lotsa scritches to all the ladies of course!