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The X-axis labels being removed is by design.
The decision to remove them was made and justified by the fact that if they were displayed it would cause the graphs to appear very small, making them not useful in most cases.
We only show the X-axis values on dashboards when the dimension is time-based. In order to see more detail about the data in the graph, you can hover over the bars of the graph and a tooltip should appear with more information.