Do not align refresh time (#6178)
Do not align refresh time (#6178)

When you have a lot of dashboards, all of them
end up refreshing their dashboards at the exact
same time, which isn't particulary good for your
TSDB backend.
grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana