Prometheus is a very well-known monitoring application that checks not only if an application is working, but also if it is working “expected” or “perfectly”.

Sidecar container is a second container added to the Pod definition. It needs to use the same resources being used by the main container.

When using Kubernetes - especially at a large scale, we need to give due time and effort in anticipating our application resource requirements correctly.

The best Kubernetes tutorials. Includes the basics of cluster management, apps/containers deployments, cluster networking, & advanced tutorials