Prometheus

A book-shaped table of contents for Prometheus: monitoring foundations through architecture, data model, instrumentation, service discovery, PromQL, alerting, production operation, PCA certification, and MAANG interview prep — cross-linking existing notes instead of duplicating them.

2 — Security

Securing the exporter-to-Prometheus link with TLS and basic auth — self-signed certs, bcrypt password hashing, tls_server_config, and end-to-end curl verification, plus an honest look at what this setup doesn't cover.

3 — Troubleshooting

Diagnosing missing metrics, duplicate series, high-cardinality blowups, slow queries, WAL corruption, and memory pressure/OOMKills in a running Prometheus deployment.

3 — Prometheus in the Observability Ecosystem

Where Prometheus sits in the CNCF landscape — its pull-based cloud-native origins, its companion projects, and where this book does (and doesn't yet) connect it to the wider stack.

2 — Exporters

What a Prometheus exporter is, installing Node Exporter as a systemd service, and monitoring the container runtime itself via Docker Engine metrics and cAdvisor.