Multiple feature flag strategies per environment

Problem to solve

The way we designed feature flags today, enforces the user to create an environment per strategy. You can't define multiple startegies per environment which is a valid use case that we want to support.

Intended users

• Developers who create feature flags
• QA engineers enabling/disabling flags
• Release managers who want to control which features are released and to which customer base
• Support engineers that wish to release features to beta customers or test version to fix bugs for specific customers

Further details

Proposal

Allow users to add multiple strategies to a feature flag.

UX Proposal

Allow users to add/remove strategies to a feature flag.

• Add a button to allow users to add additional strategies
  • On clicking a new strategy row to the bottom of the list
  • Default strategy to All users type with All environments
• Add buttons per strategy to allow users to remove a strategy
  • Require there to be at least one strategy
  • The first item of the list should not have a remove button

Permissions and Security

Users can only modify strategies that include environments they have access to. Users should only be allowed to add/remove environments they have access to.

Documentation

Testing

What does success look like, and how can we measure that?

What is the type of buyer?

Links / references

This issue is dependent on #35555 (closed)