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docs/MetricsQL.md: mention that VictoriaMetrics keeps metric names after applying functions which dont change time series meaning

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Aliaksandr Valialkin 2020-10-12 13:25:17 +03:00
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docs/MetricsQL.md
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@ -15,6 +15,8 @@ The following functionality is implemented differently in MetricsQL comparing to
* MetricsQL removes all the `NaN` values from the output, so some queries like `(-1)^0.5` return empty results in VictoriaMetrics, while returning * MetricsQL removes all the `NaN` values from the output, so some queries like `(-1)^0.5` return empty results in VictoriaMetrics, while returning
a series of `NaN` values in Prometheus. Note that Grafana doesn't draw any lines or dots for `NaN` values, so usually the end result looks the same for both a series of `NaN` values in Prometheus. Note that Grafana doesn't draw any lines or dots for `NaN` values, so usually the end result looks the same for both
VictoriaMetrics and Prometheus. VictoriaMetrics and Prometheus.
* MetricsQL keeps metric names after applying functions, which don't change the meaining of the original time series. For example, `min_over_time(foo)` or `round(foo)`
leave `foo` metric name in the result. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/674) for details.
Other PromQL functionality should work the same in MetricsQL. [File an issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues) Other PromQL functionality should work the same in MetricsQL. [File an issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues)
if you notice discrepancies between PromQL and MetricsQL results other than mentioned above. if you notice discrepancies between PromQL and MetricsQL results other than mentioned above.