The error occurred when importing JSON panels from the previous organization, with the message 'Failed to upgrade legacy queries: Datasource was not found
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Welcome
You first need to install and create the data source and/or open thr dashboard and refresh the datasource in the dashboard
Thank you for your reply, but I have already set up the PrometheusServer. I will troubleshoot it myself first. Thank you again
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Hey guys, I found the reason. The error message was pretty clear (Failed to upgrade legacy queries Datasource XXXXXX was not found), it was because the data source could not be obtained through UID. However, I didn’t know where to find the correct UID. Fortunately, with the help of my colleague, we have completely solved the problem. 
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It seems to have been found in the JSON model