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+monitor
+=======
+
+Monitor the `class-pattern` & `method-pattern` matched methods invoking traces.
+
+F.Y.I
+
+1. `monitor` is a persistent command, it never returns until `Ctrl+C` to manually stop it. 
+2. the server runs the tasks in the background;
+3. injected code will become invalid automatically once the tasks being terminated;
+4. in theory, Arthas commands will not change any original behaviors.
+
+### Properties monitored
+
+|Property|Specification|
+|---:|:---|
+|timestamp|timestamp|
+|class|Java class|
+|method|constructor and regular methods|
+|total|calling times|
+|success|success count|
+|fail|failure count|
+|rt|average RT|
+|fail-rate|failure ratio|
+
+### Parameters
+
+|Name|Specification|
+|---:|:---|
+|*class-pattern*|pattern for the class name|
+|*method-pattern*|pattern for the method name|
+|[E]|turn on regx matching while the default is wildcards matching|
+|`[c:]`|cycle of output with default value: `120 s`|
+
+### Usage
+
+```shell
+$ monitor -c 5 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute
+Press Ctrl+C to abort.
+Affect(class-cnt:1 , method-cnt:1) cost in 36 ms.
+ timestamp            class                                                         method   total  success  fail  rt    fail-rate
+-----------------------------------------------------------------------------------------------------------------------------------
+ 2015-12-17 10:56:40  com.alibaba.sample.petstore.web.store.module.screen.ItemList  execute  10     10       0     2.00  0.00%
+
+ timestamp            class                                                         method   total  success  fail  rt    fail-rate
+-----------------------------------------------------------------------------------------------------------------------------------
+ 2015-12-17 10:56:45  com.alibaba.sample.petstore.web.store.module.screen.ItemList  execute  11     11       0     2.18  0.00%
+
+ timestamp            class                                                         method   total  success  fail  rt    fail-rate
+-----------------------------------------------------------------------------------------------------------------------------------
+ 2015-12-17 10:56:50  com.alibaba.sample.petstore.web.store.module.screen.ItemList  execute  0      0        0     0.00  0.00%
+```