RemoveRolloutWorkloadRefGeneration remove the annotation of workload ref generation.

SetNewReplicaSetAnnotations sets new replica set's annotations appropriately by updating its revision and copying required rollout annotations to it; it returns true if replica set's annotation is changed.

SetReplicasAnnotations sets the desiredReplicas into the annotations.

SetRolloutRevision updates the revision for a rollout.

SetRolloutWorkloadRefGeneration updates the workflow generation annotation for a rollout.

DesiredReplicasAnnotation is the desired replicas for a rollout recorded as an annotation in its replica sets.

RevisionAnnotation is the revision annotation of a rollout's replica sets which records its rollout sequence.

RevisionHistoryAnnotation maintains the history of all old revisions that a replica set has served for a rollout.

RevisionLastAnnotation 最近一次的revision，用于乐观锁判断.

RolloutLabel key value for the label in the annotations and selector.

WorkloadGenerationAnnotation is the generation of the referenced workload.