Minimum SHA
Just land a big refactor that renames a common component? Just update your code style settings? Just fix a huge behavior bug?
Don't let PRs branched from older SHAs merge with broken code. Set your change as the minimum SHA and force all PRs to be downstream of it before they can merge.
"Do not merge" label
Rethinking your approach to a change? Doing research on historical behavior to ensure compatibility? Have external requirements that need to happen first?
A "Do not merge" label only works if someone notices it and you remember to disable auto-merge. Make the presence of the label actually block merging.
This feature is coming soon.
Target branch
Stacking PRs? Blah blah blah...
This feature is coming soon.
Required comments
Action items? Blah blah blah...
This feature is coming soon.
Better ownership
CODEOWNERS is not great? Blah blah blah...
This feature is coming soon.