Reporting graphs are blank on page load, but history is available *before* upgrade from Freenas 11.3 to Truenas Core. Issue remained after recent fresh reinstall of TrueNAS Core 12.0U1.1 and config restored.
Graphy zoom ok.
Changing selected report item ok.
Current data shown.
Zoom out to max, then step back in time to get data ok.
Its as though current data is not being recorded to history.
Screengrabs uploaded showing blank default view, and zoomed out and stepped back view.