Hi @Rajesh Swarnkar ,
Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you would like to know more about Application Gateway Metric .
You are right.
The Healthy host count and unhealthy host count represent the number of backend hosts that were healthy (getting an accepted health probe response) and unhealthy (getting a non-accepted health probe response or no response at all) respectively.
Let us know should you require any more information on the above.
Thanks,
Kapil
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