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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You must not have heard of embassy-rs. Async on embedded is absolutely a thing. Also many higher end microcontrollers these days are dual core (esp32, Raspberry Pi Pico, etc).
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Hence, a higher number means a more popular project.