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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.
The ^ macro actually annotates metadata onto the value that read, rather than the resulting runtime value. This is mentioned in the last paragraph on the metadata page, and there's some more explanation in this Github issue.
NOTE:
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