How to use

tags

method

in

org.springframework.cloud.sleuth.Span

public Map<String, String> extract(Span span, TraceSpan.SpanKind kind, String instanceId) {
  Map<String, String> labels = new HashMap<>();
  for (Map.Entry<String, String> tag : span.tags().entrySet()) {
    labels.put(label(tag.getKey()), tag.getValue());
  }
  for (Log log : span.logs()) {
    labels.put(label(log.getEvent()), formatTimestamp(log.getTimestamp()));
  }
  if (span.tags().containsKey(Span.SPAN_PEER_SERVICE_TAG_NAME)) {
    labels.put("/component", span.tags().get(Span.SPAN_PEER_SERVICE_TAG_NAME));
  }
  if (span.getParents() == null || span.getParents().isEmpty()) {
    labels.put("/agent", this.agentName);
  }
  if ((kind == TraceSpan.SpanKind.RPC_CLIENT || kind == TraceSpan.SpanKind.RPC_SERVER)
      && StringUtils.hasText(instanceId)) {
    if (StringUtils.hasText(instanceId)) {
      labels.put(label(Span.INSTANCEID), instanceId);
    }
  }
  return labels;
}

/**
 * Adds tags from the sleuth Span
 */
private void addZipkinTags(zipkin2.Span.Builder zipkinSpan, Span span) {
  Endpoint.Builder remoteEndpoint = Endpoint.newBuilder();
  boolean shouldAddRemote = false;
  // don't add redundant tags to the output
  for (Map.Entry<String, String> e : span.tags().entrySet()) {
    String key = e.getKey();
    if (key.equals("peer.service")) {
      shouldAddRemote = true;
      remoteEndpoint.serviceName(e.getValue());
    } else if (key.equals("peer.ipv4") || key.equals("peer.ipv6")) {
      shouldAddRemote = true;
      remoteEndpoint.ip(e.getValue());
    } else if (key.equals("peer.port")) {
      shouldAddRemote = true;
      try {
        remoteEndpoint.port(Integer.parseInt(e.getValue()));
      } catch (NumberFormatException ignored) {
      }
    } else {
      zipkinSpan.putTag(e.getKey(), e.getValue());
    }
  }
  if (shouldAddRemote) {
    zipkinSpan.remoteEndpoint(remoteEndpoint.build());
  }
}

if(span.getSavedSpan()!=null && span.getSavedSpan().tags()!=null){
  for (Entry<String, String> stringStringEntry : span.getSavedSpan().tags().entrySet()) {
    setHeader(request, stringStringEntry.getKey(), stringStringEntry.getValue());

protected void attachTraceInfo(Tracer tracer, Span span, final Request request) {
  if (span == null) {
    setHeader(request, Span.SAMPLED_NAME, Span.SPAN_NOT_SAMPLED);
    return;
  }
  setHeader(request, TraceRequestAttributes.HANDLED_SPAN_REQUEST_ATTR, "true");
  setHeader(request, Span.SPAN_ID_NAME, Span.idToHex(span.getSpanId()));
  setHeader(request, Span.TRACE_ID_NAME, span.traceIdString());
  setHeader(request, Span.SPAN_NAME_NAME, span.getName());
  setHeader(request, Span.SAMPLED_NAME, span.isExportable() ?
      Span.SPAN_SAMPLED : Span.SPAN_NOT_SAMPLED);
  setHeader(request, Span.PARENT_ID_NAME,Span.idToHex(getParentId(span)));
  setHeader(request, Span.PROCESS_ID_NAME, span.getProcessId());
  if(span.getSavedSpan()!=null && span.getSavedSpan().tags()!=null){
    for (Entry<String, String> stringStringEntry : span.getSavedSpan().tags().entrySet()) {
      setHeader(request, stringStringEntry.getKey(), stringStringEntry.getValue());
    }
  }
  /*spanInjector.inject(span,null);
  tracer.inject(span.context(), Format.Builtin.TEXT_MAP, new TextMap() {
    @Override
    public void put(String key, String value) {
      request.setAttachment(key, value);
    }
    @Override
    public Iterator<Entry<String, String>> iterator() {
      throw new UnsupportedOperationException("TextMapInjectAdapter should only be used with Tracer.inject()");
    }
  });*/
}