Branch tag history

[BatmanAoD]

Is there a way, either with obslog or (more hackily) op log, to see the history of a branch over time? I could probably reconstruct it by looking for branch set commands in op log, as well as new and commit (since I use the auto-branch-advancing feature), but it seems like this is something that jj should be able to determine more naturally.

[yuja]

I don't think there's a command to show ref history, but #3617 is closer. If it's integrated with jj op log, maybe we can do something like jj op log --revision branch_name --summary to filter operations by branch_name change and show diff summary for each operation.