One of the pet peeves we heard no end of complaints about when i was at MS was the lack of a decent Change Log. Even just one targeted at developers. It might seem strange to people why MS haven’t done that for the whole of Office 365, but lets just say its a really hard nut to crack.
That said the great team working on the Microsoft Graph (graph.microsoft.com) APIs have been doing a nice job on the Office dev blogs keeping us up to date on changes going on in the run up to the APIs release last week.
One of the other things I have been doing to see what is changing in the API as it’s been changing is to keep an eye on the $metadata endpoint. $metadata describes all the entity types, properties and relationships etc…
It’s available via the API when you call: https://graph.microsoft.com/beta/$metadata
The document can be quite large and manually finding changes in it is pretty painful. Diff to the rescue! You can use your favorite diff tool to see what has changed from one copy to the next.
GitHub also does reasonable diffing. I am going to try and keep a copy of the $metadata document in GitHub that people can take a look at.
The repo is here: https://github.com/LoungeFlyZ/MSGraphMetadata
Here is a link to the current diff between the /v1 API and the /beta API as of Nov 23 2015.