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Prometheus: Invest in tests and docs for min interval or min step explanation (#80165)

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* add clearer comment for function def

* update test to reflect change in range for 1w step

* clarify docs

* add more clarity

* add explanation to query options min interval and link to min step

* Update docs/sources/panels-visualizations/query-transform-data/_index.md

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

---------

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>
This commit is contained in:
Brendan O'Handley
2024-01-22 08:44:46 -06:00
committed by GitHub
co-authored by Isabel
parent 639bf3036d
commit 3409e0ea5a
4 changed files with 33 additions and 3 deletions
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docs/sources/datasources/prometheus/query-editor/index.md
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@@ -74,7 +74,7 @@ The **Legend** setting defines the time series's name. You can use a predefined
The **Min step** setting defines the lower bounds on the interval between data points.
For example, set this to `1h` to hint that measurements are taken hourly.
This setting supports the `$__interval` and `$__rate_interval` macros.
This setting supports the `$__interval` and `$__rate_interval` macros. Be aware that the query range dates are aligned to the step and this can change the start and end of the range.
### Format
@@ -96,7 +96,7 @@ For more information, refer to the [Time Series Transform option documentation][
{{% admonition type="note" %}}
Grafana modifies the request dates for queries to align them with the dynamically calculated step.
This ensures a consistent display of metrics data, but it can result in a small gap of data at the right edge of a graph.
This ensures a consistent display of metrics data and Prometheus requires this for caching results. But, aligning the range with the step can result in a small gap of data at the right edge of a graph or change the start date of the range. For example, a 15s step aligns the range to Unix time divisible by 15s and a 1w minstep aligns the range to the start of the week on a Thursday.
{{% /admonition %}}
### Exemplars