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Update and rename 44. Metrics.md to 50. Metrics.md
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### 44. 度量指标(Metrics)
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### 50. 度量指标(Metrics)
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Spring Boot执行器包括一个支持'gauge'和'counter'级别的度量指标服务。'gauge'记录一个单一值;'counter'记录一个增量(增加或减少)。同时,Spring Boot提供一个[PublicMetrics](http://github.com/spring-projects/spring-boot/tree/master/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/PublicMetrics.java)接口,你可以实现它,从而暴露以上两种机制不能记录的指标。具体参考[SystemPublicMetrics](http://github.com/spring-projects/spring-boot/tree/master/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/SystemPublicMetrics.java)
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