If an UNI's proxy port value changes to another port, then telemetry_int should reinstall the specific associated EVC sink flows accordingly. Similarly, if proxy_port is removed, it should remove all associated telemetry int flows. Essentially, changing a proxy_port metadata acts like an update as far as a EVC telemetry enabled is concerned.
To quote it from https://github.com/kytos-ng/kytos/pull/402/files