以 Micrometer 为单位的 Counter 指标的动态标签值

Posted 2023-02-15

【中文标题】以 Micrometer 为单位的 Counter 指标的动态标签值

【英文标题】：Dynamic tag values for the Counter metric in Micrometer

【发布时间】：2020-04-22 19:36:50

【问题描述】：

这里是新手，正在尝试了解有关千分尺的更多信息。我目前正在探索如何实现这一目标：

我正在使用启用了执行器和千分尺的 Spring boot 2。考虑以下类：

@Component
class MyService 
  @Autowired
  AuthorizeTransaction callbackTransaction;

  @Autowired
  AuthorizeTransaction immediateTransaction;

  private MeterRegistry meterRegistry;
  private Counter requestCounter;
  private Counter responseCounter;

  public MyService(MeterRegistry meterRegistry) 
    this.meterRegistry = meterRegistry;
    initCounters();
  

  private initCounters() 
    requestCounter = Counter.builder("iso_request")
                      .tags("mti", "0100")  // how do I change the value of this tag for other request types like 0200, 0120, etc.,
                      .register(meterRegistry);
    responseCounter = Counter.builder("iso_response")
                      .tags("mti", "0101")
                      .tags("response_code", "00") // how do I change the value of this tag for other response codes like 01, 09, etc.,
                      .register(meterRegistry);
  

  public ISOMsg process(ISOMsg request) 
    ISOMsg response = null;

    try 
      switch(request.getMTI())   // org.jboss.iso.ISOMsg
        case "0100":
        case "0200":
          if ("0100".equals(request.getMTI())) 
            requestCounter.increment();
           else 
            requestCounter.increment(); // I want to increment the counter of the same metric with tag mti=0200
          
          response = immediateTransaction.process(request);
          // here I want to increment the response counter but with different MTIs and response codes
          break;
        case "0120":
        case "0121"
          response = callbackTransaction.process(request);
          break;
        default:
          log.error("error here")
      
     catch (Exception e) 
      log.error("error here")
    

    return response;
  

我被困在这里，必须为标签值的每个组合创建不同的计数器变量，并且代码的可读性受到非常糟糕的影响。除了上面的例子，我还有很多 switch case 语句。肯定有一种简单的方法可以做到这一点，但是我找不到。

【参考方案1】：

如果您想使用特定标签计数，则必须使用Builder。方法如下：

@Component
class MyService 
  @Autowired
  AuthorizeTransaction callbackTransaction;

  @Autowired
  AuthorizeTransaction immediateTransaction;

  private MeterRegistry meterRegistry;
  private Counter.Builder requestCounter;
  private Counter.Builder responseCounter;

  public MyService(MeterRegistry meterRegistry) 
    this.meterRegistry = meterRegistry;
    initCounters();
  

  private initCounters() 
    requestCounter = Counter.builder("iso_request");
    responseCounter = Counter.builder("iso_response");
  

  public ISOMsg process(ISOMsg request) 
    ISOMsg response = null;

    try 
      switch(request.getMTI())   // org.jboss.iso.ISOMsg
        case "0100":
        case "0200":
          requestCounter.tag("mti", request.getMTI()).registry(meterRegistry);
          response = immediateTransaction.process(request);
          responseCounter.tags("mti", request.getMTI(), "response_code", "0101").registry(meterRegistry);
          // here I want to increment the response counter but with different MTIs and response codes
          break;
        case "0120":
        case "0121"
          response = callbackTransaction.process(request);
          break;
        default:
          log.error("error here")
      
     catch (Exception e) 
      log.error("error here")
    

    return response;
  

想一想：

创建一个类来封装您的 Counter 逻辑 为您的标签使用常量

让我知道它是否有效！

【讨论】：

在我看来你还是需要打电话给increment

好像也因为builder被缓存了，所以标签不断添加（见io.micrometer.core.instrument.Counter.Builder#tags）。