Azure Time Series Insights is the correct choice for ingesting storing and exploring large volumes of timestamped telemetry from delivery drones at scale.

Azure Time Series Insights is a managed time series analytics platform that is purpose built for high volume telemetry. It provides scalable ingestion and storage optimized for time stamped records and it includes fast time based queries and built in visualization tools for interactive exploration of sensor data. It also integrates with Event Hubs and IoT Hub so you can stream telemetry directly into the service.

Azure Cosmos DB is a globally distributed NoSQL database that can store telemetry and it offers low latency and flexible schemas. It is not specialized for time series exploration and it lacks the built in time based analytics and visualization features that Time Series Insights provides.

Azure Blob Storage is object storage that is cost effective for raw log or telemetry dumps and it is suitable for long term archival. It does not provide native time series querying or interactive exploration without additional processing or services layered on top.

Azure SQL Database is a relational database that can model time stamped data and it can be used for analytics. Large scale high velocity telemetry workloads are better served by a purpose built time series service because that reduces operational overhead and provides faster time based insights.

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