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monitor
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===
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> 方法执行监控
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对匹配 `class-pattern`／`method-pattern`的类、方法的调用进行监控。
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`monitor` 命令是一个非实时返回命令，实时返回命令是输入之后立即返回，而非实时返回的命令，则是不断的等待目标 Java 进程返回信息，直到用户输入 `Ctrl+C` 为止。服务端是以任务的形式在后台跑任务，植入的代码随着任务的中止而被不会被执行，所以任务关闭后，不会对原有性能产生太大影响，而且原则上，任何 Arthas 的命令也不会引起任何原有业务逻辑的改变。
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### 监控的维度说明
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|监控项|说明|
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|---:|:---|
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|timestamp|时间戳|
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|class|Java类|
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|method|方法（构造方法、普通方法）|
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|total|调用次数|
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|success|成功次数|
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|fail|失败次数|
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|rt|平均RT|
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|fail-rate|失败率|
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### 参数说明
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方法拥有一个命名参数 `[c:]`，意思是统计周期（cycle of output），拥有一个整形的参数值
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|参数名称|参数说明|
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|---:|:---|
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|*class-pattern*|类名表达式匹配|
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|*method-pattern*|方法名表达式匹配|
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|[E]|开启正则表达式匹配，默认为通配符匹配|
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|`[c:]`|统计周期，默认值为120秒|
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### 使用参考
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```shell
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$ monitor -c 5 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 36 ms.
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timestamp class method total success fail rt fail-rate
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-----------------------------------------------------------------------------------------------------------------------------------
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2015-12-17 10:56:40 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute 10 10 0 2.00 0.00%
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timestamp class method total success fail rt fail-rate
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-----------------------------------------------------------------------------------------------------------------------------------
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2015-12-17 10:56:45 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute 11 11 0 2.18 0.00%
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timestamp class method total success fail rt fail-rate
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-----------------------------------------------------------------------------------------------------------------------------------
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2015-12-17 10:56:50 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute 0 0 0 0.00 0.00%
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```
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