This article introduces some discovery of the Java memory usage in Kubernetes and how to set up a reasonable memory request/limit based on the Java heap requirement and the memory usage of the application.

This article introduces how to set up alerts for monitoring Kubernetes Pod restarts and more importantly, when the Pods are OOMKilled we can be notified.

Prometheus is an opensource time series database, commonly used to gather and calculate monitoring metrics, this article explains how the query works with /query_range API.

As a developer or operator of a Website, the certificate expiration could happen and make the services not work. I’ll introduce how to monitor certificates like SSL,JKS,P12 using Telegraf.

Certificates are broadly used for security reasons, they can be used within internal service or public service communication. The most common certificate is TLS used for verifying the identity of the HTTPS service. To increase security, the certificate will not be always valid because of expiration. To prevent the certificate expiry, we should rotate them periodically and meanwhile monitor them and alert if expired. Telegraf is a popular metric collecting tool to implement this.

Grafana has been adopted as a common monitoring dashboard by more and more companies, in many cases, when operators need to create dashboard repeatedly they either choose to use template variables or create dashboards one by one. I think it’s very useful to leverage the Grafana API to generate the monitoring dashboards automatically from template.