code: public CircuitBreakerBuilder trialRequestInterval(Duration trialRequestInterval) {
          requireNonNull(trialRequestInterval, "trialRequestInterval");
          if (trialRequestInterval.isNegative() || trialRequestInterval.isZero()) {
              throw new IllegalArgumentException(
                      "trialRequestInterval: " + trialRequestInterval + " (expected: > 0)");
          }
          this.trialRequestInterval = trialRequestInterval;
          return this;
      }
docs: Sets the trial request interval in HALF_OPEN state.
  Defaults to {@value Defaults#TRIAL_REQUEST_INTERVAL_SECONDS} seconds if unspecified.