code: public RunList<R> overThresholdOnly(final Result threshold) {
          return filter(new Predicate<R>() {
              public boolean apply(R r) {
                  return (r.getResult() != null && r.getResult().isBetterOrEqualTo(threshold));
              }
          });
      }
docs: Filter the list to builds above threshold.
  <em>Warning:</em> this method mutates the original list and then returns it.
  @since 1.517