"""Set handler as the only handler on the callback manager."""
        self.set_handlers([handler], inherit=inherit)
[docs]    def add_tags(self, tags: List[str], inherit: bool = True) -> None:
        for tag in tags:
            if tag in self.tags:
                self.remove_tags([tag])
        self.tags.extend(tags)
        if inherit:
            self.inheritable_tags.extend(tags)
[docs]    def remove_tags(self, tags: List[str]) -> None:
        for tag in tags:
            self.tags.remove(tag)
            self.inheritable_tags.remove(tag)
[docs]    def add_metadata(self, metadata: Dict[str, Any], inherit: bool = True) -> None:
        self.metadata.update(metadata)
        if inherit:
            self.inheritable_metadata.update(metadata)
[docs]    def remove_metadata(self, keys: List[str]) -> None:
        for key in keys:
            self.metadata.pop(key)
            self.inheritable_metadata.pop(key)
Callbacks = Optional[Union[List[BaseCallbackHandler], BaseCallbackManager]]