Core concept
Config: CPU + memory + concurrency + env vars. Deploys new version on push (GitHub source). HTTPS certificate auto-provisioned.
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How it works
Not for stateful. Not for background workers (needs HTTP endpoint). Slower cold start than Lambda. Simpler than Fargate.
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Trade-offs + gotchas
Web APIs. Small services. Quick launches. Startups. Non-K8s teams. Anywhere Heroku fits but on AWS.