When the community decided to rework replica management, DeploymentConfig managing ReplicationControllers was proposed by the folks from Red Hat, but the community eventually went with a different proposal of Deployment managing a new resource called a ReplicaSet.
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I would like to have the ability to gate deployments on pre and post conditions more easily - whether via a custom controller for specific deployments (deployment strategy “canary with traffic mirroring”) or something innate. Knative does some of this but should be native
One idea that has been floated is more general monitoring inputs, such as with custom metrics, analogous to HPA. For approaches that involve traffic shifting, some approaches are driven entirely by traffic, with autoscaling controlling replicas. Hybrid models are harder.