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Docs: Add a query variable topic (#25852)

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Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>

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Diana Payton
2020-07-13 09:35:13 -07:00
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co-authored by Marcus Efraimsson
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docs/sources/variables/add-interval-variable.md
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title = "Add an interval variable"
type = "docs"
[menu.docs]
weight = 500
draft = "true"
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# Add an interval variable
> Note: This is a draft topic, not included in the live build.
Use the `Interval` type to create a variable that represents a time span (eg. `1m`,`1h`, `1d`). There is also a special `auto` option that will change depending on the current time range. You can specify how many times the current time range should be divided to calculate the current `auto` timespan.
This variable type is useful as a parameter to group by time (for InfluxDB), Date histogram interval (for Elasticsearch) or as a *summarize* function parameter (for Graphite).
Example using the template variable `myinterval` of type `Interval` in a graphite function:
```
summarize($myinterval, sum, false)
```