Devops

This note is a mental model for how Prometheus discovers and scrapes metrics in Kubernetes. The lens I want to keep throughout is: Where will the scrape config file sit? (Prometheus repo vs application repo) In which namespace will the serviceMonitor sit? (and how Prometheus finds it) At a high level there are two ways to tell Prometheus about a /metrics endpoint: Static via in the Prometheus config file. Dynamic via (CRD from Prometheus Operator) with label‑based discovery. ...

This page documents a few aspects of memory management on Java containers on K8s clusters. For java containers, memory management on K8s have various factors: Xmx and Xms limits managed by java Request/limit values for the container HPA policies used for scaling the number of pods Misconfigurations / misunderstanding of any of these parameters leads to OOMs of java containers on K8s clusters. Memory management on java containers: -XX:+UseContainerSupport is enabled by default form java 10+ ...