Purpose

When working on a local branch, I should be able to get a clear understanding of the commits I've made and how that compares to master or any other target branch. I can understand how I've diverged from a branch and, if I'm behind that branch by any number of commits, I can pull that branch's commits into my branch.

• notifications around diverging from master branch and proactively detecting merge conflicts is in a later release
• continued from initial discussion here: Relationship between branches #2639

Dependencies:

• Compare to Branch [RBB] Compare to Branch #3967 - compare my work to any branch and see the commits that are ahead of that branch
• Ahead/Behind Branch Commit Counts [RBB] Ahead/Behind Branch Commit Counts #3968 - tags showing ahead/behind for each branch when choosing a branch
• Ahead/Behind Toggle [RBB] Ahead/Behind Toggle #3997 - toggle between commits ahead and behind for any branch
• Merge [RBB] Merge changes into your branch #3998 - merge in any branch to my branch for the "behind" tab
• Loading ahead/behind info for each branch is slow #4318 - Loading ahead/behind info for each branch is slow
• Analytics Discussion https://github.com/github/analytics/issues/347
• Add tracking for RBB Lite #4439 - Analytics Implementation

Designs below - #3956 (comment)