@Nullable
    @Override
    public Set<TransientServiceOption> transientServiceOptions() {
        final String val = getNormalized("transientServiceOptions");
        if (val == null) {
            return null;
        }
        return Sets.immutableEnumSet(
                Streams.stream(CSV_SPLITTER.split(val))
                       .map(feature -> TransientServiceOption.valueOf(Ascii.toUpperCase(feature)))
                       .collect(toImmutableSet()));
    }
Implementation of {@link FlagsProvider} which provides values from JVM options to {@link Flags}.
core/src/main/java/com/linecorp/armeria/common/SystemPropertyFlagsProvider.java