code: def _domain_event_metadata_change_cb(conn, domain, mtype, nsuri, opaque):
      '''
      Domain metadata change events handler
      '''
      _salt_send_domain_event(opaque, conn, domain, opaque['event'], {
          'type': _get_libvirt_enum_string('VIR_DOMAIN_METADATA_', mtype),
          'nsuri': nsuri
      }f _domain_event_metadata_change_cb(conn, domain, mtype, nsuri, opaque):
      '''
      Domain metadata change events handler
      '''
      _salt_send_domain_event(opaque, conn, domain, opaque['event'], {
          'type': _get_libvirt_enum_string('VIR_DOMAIN_METADATA_', mtype),
          'nsuri': nsuri
      })
docs: Domain metadata change events handler