I wrote a SQL query that I thought I could share. This SQL query will show collected performance data for a specific machine for the last 30 minutes. I was working with a issue where some agents stopped sending performance data. Before we found the root cause and a fix, we configured this script in a monitor to give us an alert if the agent was not sending performance data. Info how to configure a monitor to run a SQL query can be found here.
select Path, ObjectName, CounterName, InstanceName, SampleValue, TimeSampled from PerformanceDataAllView pdv with (NOLOCK) inner join PerformanceCounterView pcv on pdv.performancesourceinternalid = pcv.performancesourceinternalid inner join BaseManagedEntity bme on pcv.ManagedEntityId = bme.BaseManagedEntityId where path = 'dc01.contoso.local' AND (TimeSampled < GETUTCDATE() AND TimeSampled > DATEADD(MINUTE,-30, GETUTCDATE())) order by timesampled DESC