Log data is essential to Kubernetes management. Kubernetes is a very dynamic platform with multitudes of changes happening all the time. As containers are started and stopped, IP addresses and loads change — Kubernetes makes changes to ensure services are scaled correctly and performance is not impacted. Inevitably when things break, or performance slows down, you need the detail that only log data can provide. In the Kubernetes world, containers are constantly being deployed/terminated and it’s entirely possible that the containers generating logs for what you’re looking for may already be terminated by the time you investigate.
Source: Nodes and pods and containers oh my…(The fundamentals of K8’s logging)