It's always DNS - Zdenko Vrabel 

DNS is like hot water in a house. As long as it's working, we don't worry about it. However, the moment something goes wrong, we realize it's not a simple matter at all. DNS isn't just translating domain names to IP addresses. In the world of Kubernetes, it's also a service discovery mechanism.
Let's delve into DNS in Kubernetes. This talk tells a story of when DNS is not working as one would expect, exploring where to look and what matters in monitoring it.