Phoenix Ops

This covers the production operations checklist for Phoenix apps: releases, runtime configuration in config/runtime.exs, libcluster strategies for multi-node PubSub and Presence, telemetry setup with OpenTelemetry, and endpoint hardening (HTTPS, rate limiting, CORS). It walks through asset deployment with mix assets.deploy, Oban for background jobs, and deployment patterns for containers and systemd. The health check and observability sections are practical. Most useful when you're moving a Phoenix app from development to production or debugging clustering issues. The common pitfalls list at the end is worth reading first, especially the note about PHX_SERVER=true and avoiding compile-time secrets.