Background

Multiple different services now are powered by a QN, specifically

• Argus
• Colossus
• YT-synch

It may be useful for leads and others to understand what QN version a given operator is using, as this may be important in preparation for upgrades and debugging. This capability was explicitly requested by a lead around the Ephesus upgrade.

Proposal

Add some sort of public diagnostics endpoint which describes this, among other possibly useful things. I don't think it is a security or denial of service risk if done properly.