Once you've created the chart, click on the Format icon then switch to the X-Axis tab where you specify the label rotation. Or you can do so in Simple XML <option name="charting.axisLabelsX.majorLabelStyle.rotation">-90</option> You may be able to change the time format using the fieldformat command. index=unix (source=cpu sourcetype=cpu) OR (sourcetype=vmstat) host IN (usaws135000)
| fields _time cpu_load_percent memUsedPct swapUsedPct host
| timechart span=1h eval(round(avg(cpu_load_percent),2)) as CPUAvg eval(round(avg(memUsedPct),2)) as MemoryAvg eval(round(avg(swapUsedPct),2)) as SwapAvg by host useother=t limit=0
| fieldformat _time=strftime(_time, "%m/%d/%Y %H:%M:%S") I'm not sure if it's possible to display as many labels as in your example, but this might do it. <option name="charting.axisLabelsX.majorLabelVisibility">show</option> The default of "auto" selectively hides labels to improve readability. See https://docs.splunk.com/Documentation/Splunk/9.0.4/Viz/ChartConfigurationReference#Area.2C_Bubble.2C_Bar.2C_Column.2C_Line.2C_and_Scatter_charts for more
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