Your question is IoT Telemetry Ingestion Pipeline. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design a telemetry ingestion pipeline for millions of IoT devices deployed across a smart grid system.
Address device authentication, bursty telemetry, ordering, duplicate delivery, schema evolution, late events, replay, and downstream availability. Describe the streaming and batch components, storage model, data quality controls, observability, failure recovery, and backfill strategy. Explain how your design provides durable ingestion and supports operational dashboards and historical analytics.