OPERATIONAL DEFECT DATABASE
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"null value is invalid" error banner is shown repeatedly in the HTML5 Admin console when the Connection Server from the same POD is down. Note: You will not encounter this issue in Horizon 8 as the View Composer is deprecated in this version.
Dashboard health counter's API expects all the connection server data to be available in View API.When one or more connection servers are shut down or not reachable then it keeps failing for every health counter query initiated from the Dashboard page of Horizon.
Ensure that all the connection servers in the current cluster pod are online to prevent this error from occurring.
Navigate to other page from dashboard page to prevent this error until all the connection servers are up and running fine.
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