show Mbean information

[mbean command](https://arthas.aliyun.com/en/doc/mbean.html) can show or monitor Mbean attribute information.

### Parameters

| Name              | Specification                                                                                         |
| ----------------- | ----------------------------------------------------------------------------------------------------- |
| name-pattern      | pattern for the Mbean name                                                                            |
| attribute-pattern | pattern for the attribute name                                                                        |
| [m]               | show meta information                                                                                 |
| [i:]              | specify the interval to refresh attribute value (ms)                                                  |
| [n:]              | execution times                                                                                       |
| [E]               | turn on regex matching while the default mode is wildcard matching. Only effect on the attribute name |

## Usage

### Show all Mbean names

`mbean`{{execute T2}}

### Show meta data of Mbean

`mbean -m java.lang:type=Threading`{{execute T2}}

### Show attributes of Mbean

`mbean java.lang:type=Threading `{{execute T2}}

### Mbean name support wildcard matcher

`mbean java.lang:type=Th*`{{execute T2}}

Notes：ObjectName matching rules differ from normal wildcards, Reference resources：[javax.management.ObjectName](https://docs.oracle.com/javase/8/docs/api/javax/management/ObjectName.html?is-external=true)

### Multiple properties name matcher

Check memory pool:

`mbean java.lang:name=*,type=MemoryPool`{{execute T2}}

### Wildcards match specific attributes

`mbean java.lang:type=Threading *Count`{{execute T2}}

### Switch to regular matching using the `-E`{{}} command

`mbean -E java.lang:type=Threading PeakThreadCount|ThreadCount|DaemonThreadCount`{{execute T2}}

Check memory pool:

`mbean -E java.lang:name=*,type=MemoryPool Name|Usage|Type | grep " HEAP" -A3 -B1`{{execute T2}}

### Real-time monitoring using `-i`{{}} command

`mbean -i 1000 java.lang:type=Threading *Count`{{execute T2}}

Press `Q`{{execute T2}} or `Ctrl+C`{{}} to abort