// |  P P  |  P P  |   P   |
  // +-------+-------+-------+
  // - if MaxSkew is 1, incoming pod can only be scheduled to zone3 to become 2/2/2;
  // scheduling it onto zone1(zone2) would make the ActualSkew(3-1) on zone1(zone2)
  // violate MaxSkew(1).
  // - if MaxSkew is 2, incoming pod can be scheduled onto any zone.
  // When `whenUnsatisfiable=ScheduleAnyway`, it is used to give higher precedence