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Document sorting behaviour

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Signed-off-by: Charles Korn <charles.korn@grafana.com>
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Charles Korn 2024-05-17 13:54:08 +10:00
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7
docs/querying/api.md
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@ -473,6 +473,9 @@ Range vectors are returned as result type `matrix`. The corresponding
Each series could have the `"values"` key, or the `"histograms"` key, or both.
For a given timestamp, there will only be one sample of either float or histogram type.
Series are returned sorted by `metric`. Functions such as [`sort`](functions.md#sort)
and [`sort_by_label`](functions.md#sort_by_label) have no effect for range vectors.
### Instant vectors
Instant vectors are returned as result type `vector`. The corresponding
@ -491,6 +494,10 @@ Instant vectors are returned as result type `vector`. The corresponding
Each series could have the `"value"` key, or the `"histogram"` key, but not both.
Series are not guaranteed to be returned in any particular order unless a function
such as [`sort`](functions.md#sort) or [`sort_by_label`](functions.md#sort_by_label)`
is used.
### Scalars
Scalar results are returned as result type `scalar`. The corresponding

4
docs/querying/functions.md
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@ -596,10 +596,14 @@ have exactly one element, `scalar` will return `NaN`.
`sort(v instant-vector)` returns vector elements sorted by their sample values,
in ascending order. Native histograms are sorted by their sum of observations.
Please note that `sort` only affects the results of instant queries, as range query results always have a fixed output ordering.
## `sort_desc()`
Same as `sort`, but sorts in descending order.
Like `sort`, `sort_desc` only affects the results of instant queries, as range query results always have a fixed output ordering.
## `sort_by_label()`
**This function has to be enabled via the [feature flag](../feature_flags/) `--enable-feature=promql-experimental-functions`.**