Where are the docs on placeholder vars like $client/ for topics??

[Dreamystify]

When a client connects to the broker a topic is created '$client/<client_id>' as can be seen in the dashboard, where can I find more information about this? And is it used in both version of emq 2.3 and emqx 3.0?

Cheers

[gilbertwong96]

Hi, @DreamCatcha , what information do you want? You could get topic information via rest api

[Dreamystify]

Just the details behind the $client/<client_id> topic created without me doing anything, is this a permanent thing?

[gilbertwong96]

The topic $client/<client_id> is not permanent thing. You can not get more details about this topic