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docs: mention stats object in Prometheus API enhancements

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The doc explains fields meaning in `stats` object.
It also clarifies their purpose.
See related ticket https://github.com/VictoriaMetrics/VictoriaMetrics/issues/7170

Signed-off-by: hagen1778 <roman@victoriametrics.com>
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hagen1778 2024-10-31 15:09:04 +01:00
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docs/README.md
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@ -960,6 +960,13 @@ VictoriaMetrics accepts `limit` query arg at [/api/v1/series](https://docs.victo
for limiting the number of returned entries. For example, the query to `/api/v1/series?limit=5` returns a sample of up to 5 series, while ignoring the rest of series.
If the provided `limit` value exceeds the corresponding `-search.maxSeries` command-line flag values, then limits specified in the command-line flags are used.
VictoriaMetrics returns an extra object `stats` in JSON response for [`/api/v1/query`](https://docs.victoriametrics.com/keyconcepts/#instant-query)
and [`/api/v1/query_range`](https://docs.victoriametrics.com/keyconcepts/#range-query) APIs. This object contains two
fields: `executionTimeMsec` with number of milliseconds the request took and `seriesFetched` with number of series that
were fetched from database before filtering. The `seriesFetched` field is effectively used by vmalert for detecting
[misconfigured rule expressions](https://docs.victoriametrics.com/vmalert/#never-firing-alerts). Please note, `seriesFetched`
provides approximate number of series, it is not recommended to rely on it in tests.
Additionally, VictoriaMetrics provides the following handlers:
* `/vmui` - Basic Web UI. See [these docs](#vmui).