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$ cat /etc/nova/nova.conf | grep service_down_time
#service_down_time=60
service_down_time=60

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class DbDriver(base.Driver):
    def __init__(self, *args, **kwargs):
        self.service_down_time = CONF.service_down_time
...
    def is_up(self, service_ref):
        """Moved from nova.utils
        Check whether a service is up based on last heartbeat.
        """
        ...
        elapsed = timeutils.delta_seconds(last_heartbeat, timeutils.utcnow())
        is_up = abs(elapsed) <= self.service_down_time
        ...
...