origin/master : Keeper the all source code what reflects production-ready state. In this case accept only merge request of unique branch.
All of the changes should be merged back into
master somehow and then tagged with a
release number.
Git Flow - Good Practices
Branch DEVELOP
origin/develop : The develop branch must maintain all committees of new features, hot fixes and other codes and then only make an update to the master following the timeline with the new features. This branch is called "integration branch"
Each time when changes are merged back into master, this is a new production release by definition.