Observability Engineering

A book-shaped table of contents for observability engineering: foundations through architecture, metrics, logging, tracing, profiling, OpenTelemetry, instrumentation, Kubernetes/cloud, data platforms, visualization, alerting, SRE integration, cost, security, platform engineering, AI-driven operations, and MAANG interview preparation — cross-linking existing prometheus/grafana-cloud/kubernetes/sre/platform-engineering notes instead of duplicating them.

Operating Systems for MAANG Interviews

A book-shaped table of contents for operating systems at MAANG interview depth: foundations through processes, threads, concurrency, CPU scheduling, memory management, file systems, I/O, security & isolation, Linux internals, cloud/Kubernetes/observability, advanced kernel topics, and interview preparation — cross-linking existing sre/linux-networking, kubernetes-security, and patterns/concurrency notes instead of duplicating them.

1 — Kubernetes Metrics

Covers the cAdvisor/kubelet/kube-state-metrics metric surfaces and which one answers which question about a cluster.

2 — Control Plane Monitoring

Covers monitoring the API server, etcd, scheduler, and controller-manager — the control plane's own health as a distinct concern from workload health.

4 — Pod Monitoring

Covers pod lifecycle, restart, and readiness/liveness signal correlation with application-level telemetry.

5 — Cluster Events

Covers the Kubernetes Events API as a signal type distinct from metrics and logs, and its short default retention.