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docs: clarify information about values (#5503)

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Dmytro Kozlov 2023-12-22 16:05:16 +01:00 committed by GitHub
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docs/keyConcepts.md
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@ -80,7 +80,9 @@ See [these docs](https://docs.victoriametrics.com/FAQ.html#what-is-high-cardinal
#### Raw samples
Every unique time series may consist of an arbitrary number of `(value, timestamp)` data points (aka `raw samples`) sorted by `timestamp`.
The `value` is a [double-precision floating-point number](https://en.wikipedia.org/wiki/Double-precision_floating-point_format).
VictoriaMetrics stores all the `values` as [float64](https://en.wikipedia.org/wiki/Double-precision_floating-point_format) values
with [extra compression](https://faun.pub/victoriametrics-achieving-better-compression-for-time-series-data-than-gorilla-317bc1f95932) applied.
This guarantees precision correctness for values with up to 12 significant decimal digits ([-2^54 ... 2^54-1]).
The `timestamp` is a [Unix timestamp](https://en.wikipedia.org/wiki/Unix_time) with millisecond precision.
Below is an example of a single raw sample