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Docs: Update expression documentation to mention no data (#61934)

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Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>
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Yuri Tseretyan 2023-01-25 11:17:09 -05:00 committed by GitHub
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docs/sources/panels-visualizations/query-transform-data/expression-queries/index.md
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@ -219,3 +219,8 @@ For more information about expressions, refer to [About expressions]({{< relref
1. Write the expression.
1. Click **Apply**.
## Special cases
When any queried data source returns no series or numbers, the expression engine returns `NoData`. For example, if a request contains two data source queries that are merged by an expression, if `NoData` is returned by at least one of the data source queries, then the returned result for the entire query is `NoData`.
For more information about how [Grafana Alerting]({{< relref "../../../alerting/" >}}) processes `NoData` results, refer to [No data and error handling]({{< relref "../../../alerting/alerting-rules/create-grafana-managed-rule/#no-data-and-error-handling" >}}).