Update and rename 44.1. System metrics to 44.1. System metrics.md
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### 44.1. 系统指标
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Spring Boot暴露以下系统指标:
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- 系统内存总量(mem),单位:Kb
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- 空闲内存数量(mem.free),单位:Kb
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- 处理器数量(processors)
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- 系统正常运行时间(uptime),单位:毫秒
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- 应用上下文(就是一个应用实例)正常运行时间(instance.uptime),单位:毫秒
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- 系统平均负载(systemload.average)
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- 堆信息(heap,heap.committed,heap.init,heap.used),单位:Kb
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- 线程信息(threads,thread.peak,thead.daemon)
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- 类加载信息(classes,classes.loaded,classes.unloaded)
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- 垃圾收集信息(gc.xxx.count, gc.xxx.time)
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