@abc.abstractmethod
    def delete_metering_label_rule(self, context, rule_id):
        pass
This actually acquires the lock for a given URN.
dataset/ETHPy150Open openstack/neutron/neutron/extensions/metering.py/MeteringPluginBase.delete_metering_label_rule--crossover with--dataset/ETHPy150Open google/grr/grr/lib/aff4.py/Factory._AcquireLock