What would you like to be added:

Proper support for Hierarchical Cohorts with Fair Sharing. Determine what are the gaps to make it officially supported and implement the support.

Why is this needed:

Currently the behavior for combining Hierarchical Cohorts with FairSharing is undefined. See:

Completion requirements:

This enhancement requires the following artifacts:

• Design doc
• Implementation
• Docs update

The artifacts should be linked in subsequent comments.