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docs/keyConcepts.md: clarify the information about which data is returned by instant and range queries

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Do not use `raw samples` term there, since it adds more confusion than clarity:
the `raw samples` refers to real samples stored in the database, while neither range nor instant queries
do not return raw samples - they both return *calculated* samples at *the given* timestamps.

This is a follow-up for b5978ed8f9

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5710
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5708
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Aliaksandr Valialkin 2024-01-29 18:16:49 +01:00
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@ -517,8 +517,8 @@ Params:
in the interval between `now()` and `now()-1m`. If omitted, `step` is set to `5m` (5 minutes).
The result of Instant query is a list of [time series](https://docs.victoriametrics.com/keyConcepts.html#time-series)
matching the filter in `query` expression. Each series will have exactly one [raw sample](https://docs.victoriametrics.com/keyConcepts.html#raw-samples),
where value will contain result of `query` expression, and timestamp - the requested `time`.
matching the filter in `query` expression. Each returned series contains exactly one `(timestamp, value)` entry,
where `timestamp` equals to the `time` query arg, while the `value` contains `query` result at the requested `time`.
To understand how instant queries work, let's begin with a data sample:
@ -590,7 +590,7 @@ the following scenarios:
### Range query
Range query executes the `query` expression at the given `time` range with the given `step`:
Range query executes the `query` expression at the given [`start`...`end`] time range with the given `step`:
```
GET | POST /api/v1/query_range?query=...&start=...&end=...&step=...
@ -609,9 +609,9 @@ Params:
If the `step` isn't set, then it default to `5m` (5 minutes).
The result of Range query is a list of [time series](https://docs.victoriametrics.com/keyConcepts.html#time-series)
matching the filter in `query` expression. Each series will have arbitrary number of [raw samples](https://docs.victoriametrics.com/keyConcepts.html#raw-samples),
where value containing result of `query` expression, and timestamp contains the moment in time at which the expression was executed.
In other words, Range query is an [Instant query](#instant-query) executed `(end-start) / step` times.
matching the filter in `query` expression. Each returned series contains `(timestamp, value)` results for the `query` executed
at `start`, `start+step`, `start+2*step`, ..., `end` timestamps. In other words, Range query is an [Instant query](#instant-query)
executed independently at `start`, `start+step`, ..., `end` timestamps.
For example, to get the values of `foo_bar` during the time range from `2022-05-10 09:59:00` to `2022-05-10 10:17:00`,
we need to issue a range query: