DevOps with Kubernetes - Second Edition

Monitoring external dependencies

Aside from the aforementioned two components, we also need to check the statuses of dependent components, such as the utilization of external storage, or the consumption rate of a queue. For instance, let's say we have an application that subscribes to a queue as an input and executes tasks from that queue. In this case, we'd also need to consider metrics such as the queue length and the consumption rate. If the consumption rate is low and the queue length keeps growing, our application may have trouble.

These principles also apply to containers on Kubernetes, as running a container on a host is almost identical to running a process. However, because of the subtle distinction between the way in which containers ...