Within the dashboard editor, you can set a graph's scale
But the scale is only active in Live data mode.
As you can see on the y-axis, it auto-scales even when the graph is set with the scale option of 0-2500
So how to you work with the tools you have to get around this limitation?
You can use a simple alert instead of a metric grouping. You set the danger level to the top of your scale and then assign the alert to the graph.
This will force the graph to display a red line at the top of your scale.
If you look at the x-axis, this is over two days.