private static String getNormalized(String name, String defaultValue,
                                        Predicate<String> validator) {
        final String fullName = PREFIX + name;
        String value = System.getProperty(fullName);
        if (value != null) {
            value = Ascii.toLowerCase(value);
        }

        if (value != null) {
            if (validator.test(value)) {
                logger.info("{}: {} (sysprops)", name, value);
                return value;
            }
            logger.warn("{}: {} (sysprops, validation failed)", name, value);
        }
        logger.info("{}: {} (default)", name, defaultValue);
        return defaultValue;
    }
Returns whether {@link AnnotatedService} should leave request/response content logs
by default when a {@link LoggingService} is added.

<p>By default, this option is enabled. Specify the
{@code -Dcom.linecorp.armeria.annotatedServiceContentLogging=false} JVM option to
override the default value.
core/src/main/java/com/linecorp/armeria/common/Flags.java