code: public java.util.List<SeverityLevel> getSeverityLevels() {
          if (severityLevels == null) {
              severityLevels = new com.amazonaws.internal.SdkInternalList<SeverityLevel>();
          }
          return severityLevels;
      }
docs: <p>
  The available severity levels for the support case. Available severity levels are defined by your service level
  agreement with AWS.
  </p>
  
  @return The available severity levels for the support case. Available severity levels are defined by your service
  level agreement with AWS.