Hi @Santosh Marigowda ,
The unit of the Y-axis represents milliseconds. In this chart, you are able to check your app's performance measured in milliseconds.
We apologize for the inconvenience you might have experienced while trying to figure out what the Y-axis represents. We have taken this is feedback to our engineering team so that we can improve your experience in the Azure portal by possibly adding a label to the Y-axis.
Please let us know if you have further questions.