* Returns zero on success and if no threshold has been configured. Returns
* less than zero on failure. */
int write_riemann_threshold_check(const data_set_t *ds, const value_list_t *vl,
* Returns zero on success and if no threshold has been configured. Returns
* less than zero on failure. */
int write_riemann_threshold_check(const data_set_t *ds, const value_list_t *vl,