Thanks for bringing this to our notice. In earlier version of CanvasJS user had access to internal methods and variables which has been kept private from version 1.8. But in the future versions, we are planning to give user structured internally calculated values such as minimum and maximum. As of now, if you know the maximum value suiting to your requirement, you can set it for axisY2 and after that e.chart.options.axisY2.maximum will be available.
Yeah I don’t know the maximum though…. its completely different based on the system the product is running on and the maximum is different each day. I’m using it to display the data in MB, GB, or TB which is why I need to know what the maximum is.
For now I just hard coded it to use GB format but thats not really ideal.