Environment Variables are not working (it seems I'm not alone)

I write
export GF_DASHBOARDS_MIN_REFRESH_INTERVAL=‘500ms’

I check (I see the new variable)
echo $GF_DASHBOARDS_MIN_REFRESH_INTERVAL
env | grep GF

systemctl start grafana-server

But in the dashboard the minimum refreshing time interval I see is still ‘5ms’

Except for the specific env var, my problems is very similar to :


Does someone have an idea ? thank you