@koreanfather I did have an answer to add % or same prefix/suffix on y-axis. However, this seems like a data mapping based replacement of y-axis, which is indeed a difficult challenge to implement. I can try to have a look in some spare time 🙂 But see if you can use the following answer along with Data parsing through Custom cell renderer to solve your issue: https://community.splunk.com/t5/Splunk-Search/How-to-change-the-Y-axis-label-on-a-chart-overlay/td-p/390762 Could you add details on what is there on x-axis so that we can see if there is an alternate visualization for your needs?
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