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Add note about purge_keep_days (#10152)

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The purge_keep_days variable in the recorder component limits the max duration of a history stats sensor. This might not be clear to some users.
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J 2019-08-16 12:09:51 -05:00 committed by Fabian Affolter
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@ -119,6 +119,12 @@ duration:
minutes: 30
```
<div class='note'>
If the duration exceeds the number of days of history stored by the `recorder` component (`purge_keep_days`), the history statistics sensor will not have all the information it needs to look at the entire duration. For example, if `purge_keep_days` is set to 7, a history statistics sensor with a duration of 30 days will only report a value based on the last 7 days of history.
</div>
### Examples
Here are some examples of periods you could work with, and what to write in your `configuration.yaml`: