app/models/miq_event_handler.rb
class MiqEventHandler < MiqQueueWorkerBase
include MiqWorker::ReplicaPerWorker
self.required_roles = ["event"]
self.default_queue_name = "ems"
self.miq_messaging_subscribe_mode = "topic"
self.maximum_workers_count = 1
def self.kill_priority
MiqWorkerType::KILL_PRIORITY_EVENT_HANDLERS
end
end