public void setGracefulShutdownQuietPeriodMillis(long gracefulShutdownQuietPeriodMillis) {
        this.gracefulShutdownQuietPeriodMillis = gracefulShutdownQuietPeriodMillis;
    }
Sets the number of milliseconds to wait for active requests to go end before shutting down.

@see #setGracefulShutdownTimeoutMillis(long)
@see ServerBuilder#gracefulShutdownTimeout(Duration, Duration)
spring/boot3-autoconfigure/src/main/java/com/linecorp/armeria/spring/ArmeriaSettings.java