asyncapi-server-variables

asyncapi-server-variables compares variables used in server host and pathname templates with the server variables object.

Why did this violation appear?

A server template uses an undefined variable, or the server declares a variable that is not used in host or pathname.

Bad example

asyncapi: 3.1.0
servers:
  production:
    host: '{}.events.example.com/'
    pathname: /events/{unused}/
    protocol: mqtt
    variables:
      stale:
        default: acme

Good example

asyncapi: 3.1.0
servers:
  production:
    host: '{tenant}.events.example.com'
    pathname: /events/{region}
    protocol: mqtt
    variables:
      tenant:
        default: acme
      region:
        default: us-east

How do I fix this violation?

Define every template variable and remove variables that are no longer used.