When you create a new Metric View, the y-axis label and scale appear by default on the left side of the graph. If the graph contains multiple measures for each x-axis category, all the measures initially use the same scale, which is determined automatically using the plotted minimum and maximum values. The default scale is not necessarily appropriate for all the plotted values.
When a single scale is not appropriate for plotting all the values on the y-axis, you can use two scales, one on the right and one on the left, and choose which values should use each scale.
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