@Nullable
    private static String getNormalized(String name) {
        final String fullName = PREFIX + name;
        String value = System.getProperty(fullName);
        if (value != null) {
            value = Ascii.toLowerCase(value);
        }
        return value;
    }
Implementation of {@link FlagsProvider} which provides values from JVM options to {@link Flags}.
core/src/main/java/com/linecorp/armeria/common/SystemPropertyFlagsProvider.java