What does topic:group and topic:controller mean?

[dhgokul]

when tried list topic in rpk cmd, it doesn't include group and contoller.

But in redpanda monitor , topic list include group and controller,
If it was default topic is it possible to clear /reset.
Is that count increse on large will affect redpanda performance

[emaxerrno]

@dhgokul i don't understand what the question is. can you add more context.