Blank results might mean you have no permission to view _internal index... However, I am not aware of any way to append some text to a number and for Splunk to then plot that numerically. One thought it that if you add data values ON to the chart, whether with some Javascript and CSS you could dynamically change the visible text to add the percentage, but I don't know how to do that. See this developer tools view of the <tspan> element showing the data label of the graph value. I suspect this IS possible, but you would need to have the CSS and probably Javascript knowledge to do it.
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