Is the SQL server being monitored using SQL credentials or Windows credentials? The metrics included in your screenshot are not available via SQL directly, and must be gathered from the operating system itself. This is determined when AppInsight for SQL is first applied to the node. You will likely need to remove and reapply AppInsight for SQL to this node using Windows credentials to authenticate to the SQL server before these metrics will appear. In the case of these metrics, the node polling method is irrelevant as some users prefer to monitor their hosts via SNMP. As such, these statistics are tied to the credentials assigned to AppInsight for SQL.
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