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Writing to SD cards looks straightforward until you hit power interruptions. I lost enough logs to treat write integrity as a first-class feature. My format is append-only CSV with periodic file sync.
Many embedded dashboards look stable only because noise is hidden by aggressive averaging. That is not the same as accurate measurement.
Telemetry schema changes are inevitable: new sensors, renamed fields, unit corrections, derived metrics. If evolution is unmanaged, dashboards break silently and analytics lose trust.
Detailed comparison of Protobuf and JSON in Rust telemetry pipelines across performance, compatibility, and operability.
