Harness has implemented ephemeral environments in Kubernetes to enhance deployment flexibility and team collaboration by enabling developers to deploy feature branches for testing without bottlenecks. This approach facilitates stress testing, upgrade path verification, and data state preservation across various testing scenarios, moving beyond initial constraints of limited deployment environments. By allowing the creation of temporary environments that can be set up and dismantled as easily as a git branch, Harness offers developers a scalable and cost-effective solution to collaborate across different teams, including Quality Engineering, Security Operations, and UX Design. Utilizing Kubernetes ingress and Harness, these environments can be created on-demand and used for testing different resource configurations, migration paths, and data states. This setup ensures that testing can be performed in isolated environments, reducing the competition for resources and providing significant flexibility for developers. The process involves configuring namespaces with specific metadata to manage resource usage effectively, ensuring environments are automatically dismantled after their designated time, thereby optimizing resource utilization.