Endpoint to get a list of connected instances (subscribers)?

[MikeHuntington]

I checked out /nodeinfo/2.1 but it only return the number of subscribers.

Is there a way to query "relay control domain list" from the web?

I'm trying to create a frontend for Activity-Relay, that's why I would need this.

[xrobau]

Already working on that - https://git.artemai.art/xrobau/relaymgr talks directly to redis and will provide a reasonable UI for subscribers. The idea being is to allow smaller instances to avoid the firehose effect of a big relay.

Code is under development at https://relay.oi.au/

However, the exact code you're looking for is https://git.artemai.art/xrobau/relaymgr/-/blob/master/app/Components/Subscribers.php