CalculateRolloutPhase calculates a rollout phase and message for the given rollout based on rollout spec and status.

CanaryStepString returns a string representation of a canary step.

GetRolloutPhase returns a status and message for a rollout.

IsFullyPromoted returns whether or not the given rollout is in a fully promoted state.

IsUnpausing detects if we are in the process of unpausing a rollout.

ShouldVerifyWeight We use this to test if we should verify weights because weight verification could involve API calls to the cloud provider which could incur rate limiting.