docs: @ExperimentalApi("https://github.com/grpc/grpc-java/issues/1704")
    public Set<String> getAdvertisedMessageEncodings() {
      Set<String> advertisedDecompressors = new HashSet<>(decompressors.size());
      for (Entry<String, DecompressorInfo> entry : decompressors.entrySet()) {
        if (entry.getValue().advertised) {
          advertisedDecompressors.add(entry.getKey());
        }
      }
      return Collections.unmodifiableSet(advertisedDecompressors);
    }