code: public Optional<NrqlAlertCondition> create(long policyId, NrqlAlertCondition condition)
      {
          return HTTP.POST(String.format("/v2/alerts_nrql_conditions/policies/%d.json", policyId), condition, NRQL_ALERT_CONDITION);
      }
docs: Creates the given NRQL alert condition.
  @param policyId The id of the policy to add the alert condition to
  @param condition The alert condition to create
  @return The alert condition that was created