static Set<String> lowTraceIdsInRange(
    Collection<TraceIdTimestamp> descendingByTimestamp, long endTs, long lookback) {
    long beginTs = endTs - lookback;
    Set<String> result = new LinkedHashSet<>();
    for (TraceIdTimestamp traceIdTimestamp : descendingByTimestamp) {
      if (traceIdTimestamp.timestamp >= beginTs && traceIdTimestamp.timestamp <= endTs) {
        result.add(traceIdTimestamp.lowTraceId);
      }
    }
    return Collections.unmodifiableSet(result);
  }
Used for testing. Returns all dependency links unconditionally.
zipkin/src/main/java/zipkin2/storage/InMemoryStorage.java