In perfmon instances of SignalR perf counters for full IIS only show web site instance like "default web site" , doesn't show web application instances.

Repro:

1. Install SignalR perf counters
2. Create 2+ SignalR Web applications under default web site in IIS and request/start SignalR connections on the 2 SignalR Web applications
3. Open perfmon, add counters and select SignalR

Result:
Instances of SignalR web applications in full IIS are not listed there

In the instances, we can only see:
< all instances>
default web site

Expected:
List instances for SignalR web applications, something like virtual paths in full IIS instead of web site

Note, this is not regression, but it is better to fix it