How to see history of snap packages updates?
Solution 1:
snap changes will list recent changes, and snap tasks will list the steps involved in a change.
It gets garbage-collected after some time (1 day for changes that succeeded, 7 for failures), or after a certain size (500 changes), both of which are currently hardcoded, but it's the commmand you want.
I'll update lp:1771714 to reflect this.