Detect a hung server, nonresponding state

I set up an alert/dashboard to let me know when we were not getting monitoring data (cpu/disk/etc).  Depends if you are doing agent or agentless.  I do agentless and query on Orion.Nodes.LastSystemUpTimePollUtc.

This is from my dashboard (minus bits I flavor in from custom properties).  Alert works the same, just set to 'Custom SWQL' and 'node' (leave off select and from statements as the alert builder gives you no choices there).

SELECT 
Caption, 
n.DetailsUrl as [_linkfor_Caption],
'/Orion/images/StatusIcons/Small-' + n.StatusIcon AS [_IconFor_Caption],
ToLocal(N.LastSystemUpTimePollUtc) as LastSystemUpTimePollUtc,   
ToLocal(NextPoll) as NextPoll, 
N.Engine.DisplayName as PollingEngine, 

FROM Orion.Nodes N

WHERE
    N.UnManaged = 0 --node has not been unmanaged
    AND N.LastSystemUpTimePollUtc < ADDDATE('Minute', -30, GETUTCDATE())

Order by LastSystemUpTimePollUtc DESC

I'm new to SW and this setup is over my head.  I'm using agent monitoring and was hoping there was an out of the box alert I could use.  

you got this!

Sure someone smarter has something.  If not here is how to set it up.
just copy/paste the WHERE clause into a 'custom SQWL alert' and see if it works for you.

Alert logic

WHERE
    Nodes.UnManaged = 0 --Node has not been unmanaged
    AND Nodes.Status != '2'  --Node is not down.
    AND Nodes.LastSystemUpTimePollUtc < ADDDATE('Minute', -60, GETUTCDATE())

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Screenshot

Hi,  I copied and pasted your SWQL query but getting this error message.  

ThomasNg, you need to remove the first "AND"

WHERE
    Nodes.UnManaged = 0 --Node has not been unmanaged
    AND Nodes.Status != '2'  --Node is not down.
    AND Nodes.LastSystemUpTimePollUtc < ADDDATE('Minute', -60, GETUTCDATE())

Thanks, I missed a bit when I cleaned up my custom properties.

Edit to remove leading 'and' as posted by christopher.t.jones123 (thanks again for peer review ).

That was it.  Thanks all!