Explore: Remove exploreMixedDatasource feature toggle (#71534)

docs/sources/explore/_index.md

@@ -66,11 +66,3 @@ Available in Grafana 7.3 and later versions.
 {{% /admonition %}}
 
 The Share shortened link capability allows you to create smaller and simpler URLs of the format /goto/:uid instead of using longer URLs with query parameters. To create a shortened link to the executed query, click the **Share** option in the Explore toolbar. A shortened link that is never used will automatically get deleted after seven (7) days.
-
-## Available feature toggles
-
-### exploreMixedDatasource
-
-Enabled by default, allows users in Explore to have different data sources for different queries. If compatible, results will be combined.
-
-Learn more about how to use [Mixed data source]({{< relref "../datasources/#special-data-sources" >}}).

docs/sources/explore/query-management.md

@@ -53,6 +53,8 @@ Filter query history in Query history and Starred tab by data source name:
 1. Click the **Filter queries for specific data source(s)** field.
 1. Select the data source for which you would like to filter your history. You can select multiple data sources.
 
+> **Note:** Queries ran using the Mixed data source will appear only when filtering for Mixed and not when filtering by their individual data sources.
+
 In **Query history** tab it is also possible to filter queries by date using the slider:
 
 - Use vertical slider to filter queries by date.