code: public RolloutGroupConditionBuilder successCondition(final RolloutGroupSuccessCondition condition,
              final String expression) {
          conditions.setSuccessCondition(condition);
          conditions.setSuccessConditionExp(expression);
          return this;
      }
docs: Sets the finish condition and expression on the builder.
  
  @param condition
  the finish condition
  @param expression
  the finish expression
  @return the builder itself