code: public java.util.List<PatchSource> getSources() {
          if (sources == null) {
              sources = new com.amazonaws.internal.SdkInternalList<PatchSource>();
          }
          return sources;
      }
docs: <p>
  Information about the patches to use to update the instances, including target operating systems and source
  repositories. Applies to Linux instances only.
  </p>
  
  @return Information about the patches to use to update the instances, including target operating systems and
  source repositories. Applies to Linux instances only.