code: public java.util.List<Configuration> getLastSuccessfullyAppliedConfigurations() {
          if (lastSuccessfullyAppliedConfigurations == null) {
              lastSuccessfullyAppliedConfigurations = new com.amazonaws.internal.SdkInternalList<Configuration>();
          }
          return lastSuccessfullyAppliedConfigurations;
      }
docs: <p>
  A list of configurations that were successfully applied for an instance group last time.
  </p>
  
  @return A list of configurations that were successfully applied for an instance group last time.