I recently updated system from v11 to v12, and to new servers including architecture change with NTA (separate server for FSD). I think everything worked after changes, but now I noticed that all netflow graphs are empty. And I haven't change anything since those updates. I checked some instructions to see why's that, and one instruction told to check if polling time differs from graph setting:
Verify that the sample interval on the chart is longer than the polling frequency for the data the chart should display.
I couldn't find sample interval setting from graph edit. I think that instruction is from old version of NPM. Where it is hidden now?
Solved! I recently moved SQL to another server, and forgot to tell new server path to flow storage database. Stupid me!