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How OTP supervisors restart failed workers: one_for_one vs one_for_all vs rest_for_one, a worked supervisor module with map child specs, intensity/period escalation, and the state-loss and crash-loop mistakes to avoid.
GenServer and supervision trees give fault‑isolated, stateful processes with automatic restart and state recovery—no external orchestrator needed. A worked example shows per‑device telemetry ingest with DynamicSupervisor.
Stop using try-catch for everything. Learn how Erlang's 'Let it Crash' philosophy and supervision trees create resilient systems by isolating failures and automating recovery.
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