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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _add_discovery_config(self):
 """Add the Discovery configuration to our list of configs. This should only be called with self._config_lock. The code here assumes the lock is held. """

    lookup_key = (discovery_service.DiscoveryService.API_CONFIG['name'],
                  discovery_service.DiscoveryService.API_CONFIG['version'])
    self._configs[lookup_key] = discovery_service.DiscoveryService.API_CONFIG