Spring AI Can anyone help solve this problem--Custom Advisor cannot obtain token consumption quantity

I wanted to obtain the number of tokens consumed for calling the large model, so I customized the Advisor, but it didn't take effect

Here is my definition of Advisor： `public class CustomizeLoggerAdvisor implements CallAdvisor, StreamAdvisor {

private Integer order;

@Override public String getName() { return this.getClass().getSimpleName(); }

@Override public int getOrder() { return null != order ? order : 1; }

private ChatClientRequest before(ChatClientRequest request) { log.info("AI Request: {}", request.prompt().getContents()); return request; }

private void observeAfter(ChatClientResponse advisedResponse) { ChatResponse response = advisedResponse.chatResponse(); if (null == response) { log.info("AI Response is null"); return; } ChatResponseMetadata responseMetadata = response.getMetadata(); Usage usage = responseMetadata.getUsage(); log.info("total tokens：{}", usage.getTotalTokens()); log.info("input tokens：{}", usage.getPromptTokens()); log.info("output tokens：{}", usage.getCompletionTokens()); }

@Override public ChatClientResponse adviseCall(ChatClientRequest advisedRequest, CallAdvisorChain chain) { advisedRequest = this.before(advisedRequest); ChatClientResponse advisedResponse = chain.nextCall(advisedRequest); this.observeAfter(advisedResponse); return advisedResponse; }

@Override public Flux adviseStream(ChatClientRequest advisedRequest, StreamAdvisorChain chain) { advisedRequest = this.before(advisedRequest); Flux advisedResponses = chain.nextStream(advisedRequest); return new ChatClientMessageAggregator(). aggregateChatClientResponse(advisedResponses, this::observeAfter); }`

I added my defined Advisor to ChatClient： ChatClient .builder(openedAiChatModel).defaultAdvisors(new CustomizeLoggerAdvisor()) .build()

After calling the big model, the tokens I obtained were all 0