def METHOD_NAME(self, job_id) -> set:
    """Get unique hosts found in job events."""
    events_generator = self.client.get_paginated_results(
        f"api/v2/jobs/{job_id}/job_events/?event=runner_on_start",
        **self.REQUEST_KWARGS,
    )
    unique_hosts = set()
    for event in events_generator:
        unique_hosts.add(event["host_name"])
    # ignore garbage hosts
    unique_hosts -= {"", None}
    return unique_hosts