public Config getStreamProperties(String streamId) {
    MapConfig allProperties = getAllStreamProperties(streamId);
    Config samzaProperties = allProperties.subset(SAMZA_PROPERTY, false);
    Map<String, String> filteredStreamProperties =
      allProperties.entrySet().stream().filter(kv -> !samzaProperties.containsKey(kv.getKey())).collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
    return new MapConfig(filteredStreamProperties);
  }
Returns a list of all SystemStreams that have a serde defined from the config file.
samza-core/src/main/java/org/apache/samza/config/StreamConfig.java