I scale out an App Service Plan to 2 instances. So how to monitor each instance individually. Metrics board has no option for this, only show average of both.
I know it's a bit old thread but wanted to provide an update if you are still looking for a response on it.
I believe your requirement is currently not a supported feature so I would recommend to raise a feature request in this Azure feedback forum / UserVoice. In general, Azure feature team would check feasibility of the feature request, prioritize against existing feature backlog, add in roadmap as appropriate and would announce and/or update the related Azure document once a feature request is addressed.