Perhaps others have noticed as well... the icon to reset the graph is allways quite in the way of the most relevant data. My suggestion would be to move the icon to the bottom right corner.
#Core: placement of reset graph icon
sturdy osprey
daring thunder
That would make it equally in the way if data is trending downwards.
I agree with your point, but I think the button needs to be outside the chart area.
sturdy osprey
In fact I noticed that a double click also resets the graph so I wonder if it is needed at all... or have it optional somehow.