asyncapi-channel-parameters compares placeholders in a channel address with the channel parameters object. Every {name} in the address must be defined, and every defined parameter should be used.

Why did this violation appear?

The channel address and parameter definitions do not match.

Bad example

asyncapi: 3.1.0
channels:
  userEvents:
    address: users/{userId}/{action}
    parameters:
      userId:
        description: User identifier.
      unused:
        description: Not used by the address.

Good example

asyncapi: 3.1.0
channels:
  userEvents:
    address: users/{userId}/{action}
    parameters:
      userId:
        description: User identifier.
      action:
        description: Event action.

How do I fix this violation?

Add missing parameter definitions and remove stale definitions that are not used by the address.