Systems are no longer simple. As tens or even hundreds of microservices run as containers distributed across the cloud, complexity has become an unavoidable challenge.

The moment you choose Kubernetes, that complexity becomes your reality. The only way to overcome it is to see your system—to understand its state, detect anomalies early, reduce failures, and shorten response times. The core capability that makes this possible is observability.

In the constantly shifting world of Kubernetes, where it's nearly impossible to predict when or where issues will occur, observability isn't optional—it's essential. This eBook offers practical insights to help you build real-world Kubernetes observability.

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1. Why "Observability" is Strictly Necessary in Kubernetes

1. The Context of Kubernetes' Emergence and the Root of Its Complexity
2. Why Observability is Needed in a Kubernetes Environment
3. Monitoring vs. Observability
4. Challenges for Enterprises to Secure Kubernetes Observability

2. Real-World Case: Responding to Control Plane Overload

1. Kubernetes Outages Experienced by Enterprises
2. The Importance of "Kubernetes Control Plane" Monitoring Seen Through the Massive ChatGPT Outage
3. The Importance of Control Plane Monitoring
4. WhaTap's Control Plane Monitoring
5. Conclusion and Lessons Learned

3. OOM Problems in Kubernetes Environments: Root Cause Analysis and Solutions

1. Container OOM Caused by Higher-Than-Expected Resource Consumption
2. Application OOM Occurring in a Containerized Environment
3. Three Operational Strategies to Prevent OOM Recurrence