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tags and fields

Tags say which device a reading came from; fields hold the measured numbers.

In the time-series data model, tags are indexed metadata (device ID, site) used to select series, and fields are the measured values, which are not indexed.

Examples

  • In a greenhouse reading, site = gh1, device = gh-a1 and kind = climate are tags you filter by, while temp_c, rh_pct and batt_mv are fields you average.

See also

time series time-series database aggregate
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