[ENH] Add Node ID in Instances Page

## Enhancement Request

### Enhancement Overview
In multi node setup where all nodes are sharing the same DB, I would like to know which backend node had processed which requests, therefor adding a unique identifier in the Instances page for each instance to show which node has processed the request would be practical, e.g. adding `Environment.MachineName` by default or allow the developer to specify the node name in appsettings.json or in Program.cs file for that node.

### Use Cases
To troubleshoot e.g. if a certain node is not performing as expected, or to make sure that round-robin is working properly.