@Override public int hashCode() {
      int h$ = 1;
      h$ *= 1000003;
      h$ ^= lowTraceId.hashCode();
      h$ *= 1000003;
      h$ ^= (int) ((timestamp >>> 32) ^ timestamp);
      return h$;
    }
Returns service names orphaned by removing the trace ID
zipkin/src/main/java/zipkin2/storage/InMemoryStorage.java