As cloud-native architectures continue to evolve, Kubernetes has become the go-to platform for deploying complex, distributed systems. One of the most powerful yet nuanced design patterns in this ecosystem is the sidecar pattern—a technique that allows developers to extend application functionality without diving deep into source code. The origins of the sidecar pattern Think of a sidecar like a trusty companion motorcycle attachment. Historically, IT infrastructures have always used auxiliary services to handle critical tasks.