I'm experiencing exactly the same issue in NPM 10.6. Can anyone enlighten us please?
Has the data been successfully polled from the node?
Without the status value the report is showing interfaces on nodes where the poller has been assigned
With the custom poller status value the report is showing interfaces on nodes where the poller has been assigned and a value retrieved from the node.
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I managed to solve the problem simply by using the report type 'Current Status of Nodes, Interfaces, etc'. In my case I suspect the reason the 'Historical - Custom Pollers' report type didn't work was because the UDP was set not to keep historical data, which does kind of explain why the values are null when looking at historical data.