SolarWinds Active Alert Dashboard

You can change the underlying SWQL queries.  In fact, the detail about the filtering is listed in the comments near the end of the query (at least for the table element):

------------- Begin Snippet -------------
-- Mandatory JOINS needed if you want to filter via nodes custom properties
--LEFT JOIN Orion.NodesCustomProperties AS [NodeCP]
--  ON [AlertObjects].RelatedNodeID = NodeCP.NodeID
--LEFT JOIN Orion.Nodes AS [Nodes]
--  ON [AlertObjects].RelatedNodeID = Nodes.NodeID
WHERE [AlertObjects].AlertActive.AlertActiveID > 0
-- AND [AlertObjects].Node.CustomProperties.[CP_Name] = 'CP_Value'
-------------- End Snippet --------------

Hi all, i want to filter Alert by Nodes custom properties (City = London). how can do that ?

Look in the Orion.AlertHistory entity in SWQL.  For more questions like this, you should ask in the Orion SDK forum.

The query is in line 812 of the above code sample.

i'm trying to add the trend of the alert in graphical representation . please suggest can i use the time series data to do it ?