I’ve found this Latest compatibility matrix - Snowplow Docs which is helpful to see what collectors and trackers match well together.
Unfortunately, we are running an older collector (scala 0.9.0 Metamorphosis). It’s currently paired with Android 1.7.1 and iOS 1.7.0 Trackers.
I was wondering if there are breaking changes if we would want to upgrade our Trackers to the 2.x or 3.x series (while continuing the use of the 0.9.0 collector)? Did anything change in the data format that is being sent over?