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When scaling a rackSensitive request, it is best to scale to a number of instances that is a multiple of the number of racks to evenly spread load across each rack.
With this change, if scaling is selected but the target number of instances is not a multiple of the number of racks, a new dialog will pop up notifying the user of this fact. It has radio buttons to choose between the number they entered, the multiple one lower than the number they entered (but 0 is never suggested), and the multiple one higher than the one they entered.
… instances to scale to and give options
…veryone for this request forever, and made the checkbox for this in the edit form field remember current state