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documentation: Fix query docs
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This commit changes the following:
-   The datetime has been fixed so it corresponds to the timestamps in example samples. The datetime now also include the UTC time zone and is changed to adhere ISO format.
-   The data points in query range result have been fixed to match the inserted data.

Signed-off-by: Artem Fetishev <rtm@victoriametrics.com>
This commit is contained in:
Artem Fetishev 2024-11-05 15:36:14 +01:00 committed by GitHub
parent a3401c8d64
commit d311c12dce
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1 changed files with 54 additions and 54 deletions
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docs/keyConcepts/keyConcepts.md
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@ -497,19 +497,19 @@ where `timestamp` equals to the `time` query arg, while the `value` contains `qu
To understand how instant queries work, let's begin with a data sample:
```
foo_bar 1.00 1652169600000 # 2022-05-10 10:00:00
foo_bar 2.00 1652169660000 # 2022-05-10 10:01:00
foo_bar 3.00 1652169720000 # 2022-05-10 10:02:00
foo_bar 5.00 1652169840000 # 2022-05-10 10:04:00, one point missed
foo_bar 5.50 1652169960000 # 2022-05-10 10:06:00, one point missed
foo_bar 5.50 1652170020000 # 2022-05-10 10:07:00
foo_bar 4.00 1652170080000 # 2022-05-10 10:08:00
foo_bar 3.50 1652170260000 # 2022-05-10 10:11:00, two points missed
foo_bar 3.25 1652170320000 # 2022-05-10 10:12:00
foo_bar 3.00 1652170380000 # 2022-05-10 10:13:00
foo_bar 2.00 1652170440000 # 2022-05-10 10:14:00
foo_bar 1.00 1652170500000 # 2022-05-10 10:15:00
foo_bar 4.00 1652170560000 # 2022-05-10 10:16:00
foo_bar 1.00 1652169600000 # 2022-05-10T08:00:00Z
foo_bar 2.00 1652169660000 # 2022-05-10T08:01:00Z
foo_bar 3.00 1652169720000 # 2022-05-10T08:02:00Z
foo_bar 5.00 1652169840000 # 2022-05-10T08:04:00Z, one point missed
foo_bar 5.50 1652169960000 # 2022-05-10T08:06:00Z, one point missed
foo_bar 5.50 1652170020000 # 2022-05-10T08:07:00Z
foo_bar 4.00 1652170080000 # 2022-05-10T08:08:00Z
foo_bar 3.50 1652170260000 # 2022-05-10T08:11:00Z, two points missed
foo_bar 3.25 1652170320000 # 2022-05-10T08:12:00Z
foo_bar 3.00 1652170380000 # 2022-05-10T08:13:00Z
foo_bar 2.00 1652170440000 # 2022-05-10T08:14:00Z
foo_bar 1.00 1652170500000 # 2022-05-10T08:15:00Z
foo_bar 4.00 1652170560000 # 2022-05-10T08:16:00Z
```
The data above contains a list of samples for the `foo_bar` time series with time intervals between samples
@ -518,11 +518,11 @@ ranging from 1m to 3m. If we plot this data sample on the graph, it will have th
![data samples](data_samples.webp)
{width="500"}
To get the value of the `foo_bar` series at some specific moment of time, for example `2022-05-10 10:03:00`, in
To get the value of the `foo_bar` series at some specific moment of time, for example `2022-05-10T08:03:00Z`, in
VictoriaMetrics we need to issue an **instant query**:
```sh
curl "http://<victoria-metrics-addr>/api/v1/query?query=foo_bar&time=2022-05-10T10:03:00.000Z"
curl "http://<victoria-metrics-addr>/api/v1/query?query=foo_bar&time=2022-05-10T08:03:00.000Z"
```
```json
@ -536,7 +536,7 @@ curl "http://<victoria-metrics-addr>/api/v1/query?query=foo_bar&time=2022-05-10T
"__name__": "foo_bar"
},
"value": [
1652169780, // 2022-05-10 10:03:00
1652169780, // 2022-05-10T08:03:00Z
"3"
]
}
@ -546,8 +546,8 @@ curl "http://<victoria-metrics-addr>/api/v1/query?query=foo_bar&time=2022-05-10T
```
In response, VictoriaMetrics returns a single sample-timestamp pair with a value of `3` for the series
`foo_bar` at the given moment in time `2022-05-10 10:03`. But, if we take a look at the original data sample again,
we'll see that there is no raw sample at `2022-05-10 10:03`. When there is no raw sample at the
`foo_bar` at the given moment in time `2022-05-10T08:03:00Z`. But, if we take a look at the original data sample again,
we'll see that there is no raw sample at `2022-05-10T08:03:00Z`. When there is no raw sample at the
requested timestamp, VictoriaMetrics will try to locate the closest sample before the requested timestamp:
![instant query](instant_query.webp)
@ -592,11 +592,11 @@ matching the filter in `query` expression. Each returned series contains `(times
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`,
For example, to get the values of `foo_bar` during the time range from `2022-05-10T07:59:00Z` to `2022-05-10T08:17:00Z`,
we need to issue a range query:
```sh
curl "http://<victoria-metrics-addr>/api/v1/query_range?query=foo_bar&step=1m&start=2022-05-10T09:59:00.000Z&end=2022-05-10T10:17:00.000Z"
curl "http://<victoria-metrics-addr>/api/v1/query_range?query=foo_bar&step=1m&start=2022-05-10T07:59:00.000Z&end=2022-05-10T08:17:00.000Z"
```
```json
@ -628,44 +628,44 @@ curl "http://<victoria-metrics-addr>/api/v1/query_range?query=foo_bar&step=1m&st
],
[
1652169840,
"7"
],
[
1652169900,
"7"
],
[
1652169960,
"7.5"
],
[
1652170020,
"7.5"
],
[
1652170080,
"6"
],
[
1652170140,
"6"
],
[
1652170260,
"5.5"
],
[
1652170320,
"5.25"
],
[
1652170380,
"5"
],
[
1652170440,
1652169900,
"5"
],
[
1652169960,
"5.5"
],
[
1652170020,
"5.5"
],
[
1652170080,
"4"
],
[
1652170140,
"4"
],
[
1652170260,
"3.5"
],
[
1652170320,
"3.25"
],
[
1652170380,
"3"
],
[
1652170440,
"2"
],
[
1652170500,
"1"
@ -686,7 +686,7 @@ curl "http://<victoria-metrics-addr>/api/v1/query_range?query=foo_bar&step=1m&st
```
In response, VictoriaMetrics returns `17` sample-timestamp pairs for the series `foo_bar` at the given time range
from `2022-05-10 09:59:00` to `2022-05-10 10:17:00`. But, if we take a look at the original data sample again, we'll
from `2022-05-10T07:59:00Z` to `2022-05-10T08:17:00Z`. But, if we take a look at the original data sample again, we'll
see that it contains only 13 raw samples. What happens here is that the range query is actually
an [instant query](#instant-query) executed `1 + (start-end)/step` times on the time range from `start` to `end`. If we plot
this request in VictoriaMetrics the graph will be shown as the following: