code: @SuppressWarnings("PMD.UseStringBufferForStringAppends")
      public static String getContextMarkers(final AdminContext context) {
          String res = "";
          if (isForAdmin(context)) {
              if (isForMain(context)) {
                  res += "M";
              }
              res += "A";
          }
          return res;
      }
docs: Returns "" for main context (assuming its default) and "A" for admin context. "MA" returned if both contexts
  installation configuration.
  
  @param context context annotation
  @return target contexts marker string