code: public void checkTtl(String serviceId, Status status, String note) {
          check("service:" + serviceId, status, note);
      }
docs: Prepends the default TTL prefix to the serviceId to produce a check id,
  then delegates to check(String checkId, State state, String note)
  This method only works with TTL checks that have not been given a custom
  name.
  
  @param serviceId service id
  @param status    state
  @param note      note