Zhecheng Li enhanced the reliability of Kubernetes admission control by implementing robust retry logic for updating ValidatingWebhookConfigurations and MutatingWebhookConfigurations in the kubernetes/kubernetes repository. Using Go and leveraging E2E testing, Zhecheng addressed transient update failures that can occur during deployments and upgrades, thereby reducing operator toil and improving overall cluster stability. The solution introduced a systematic retry pattern to the webhook configuration update path, ensuring that temporary errors no longer disrupt the admission control process. This work demonstrated a focused application of Kubernetes internals and webhook configuration expertise, resulting in a deeper, more resilient update mechanism for critical cluster components.