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What Grafana version and what operating system are you using? 
 AWS Managed Grafana, I see version v9.4.7 on the UI.
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What are you trying to achieve? 
 Show a panel with data summed across multiple datasources.
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How are you trying to achieve it? 
 I will use a datasource variable, which allows multi-select and all-select to select the datasources.
 I have a bar chart.
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What happened? 
 My datasource variable appears as a drop down on the UI. If I select exactly 1 datasource, the data returned is correct. If I select more than 1 datasource, I notice the data returned is for only the first datasource selected as part of the variable.
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What did you expect to happen? 
 I expect to get data from all datasources selected within the datasource drop down.
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Can you copy/paste the configuration(s) that you are having problems with? 
 Here is my Query
 
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Did you receive any errors in the Grafana UI or in related logs? If so, please tell us exactly what they were. 
 No errors.
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Did you follow any online instructions? If so, what is the URL? 
 No
