获取分布式跟踪的 traceId，比如eagleeye的

[hengyunabc]

watch

可以直接调用static函数来获取traceId，比如：

[arthas@39996]$ watch com.test.pandora.eagleeye.HomeController home '@com.taobao.eagleeye.EagleEye@getTraceId()'
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 47 ms, listenerId: 4
ts=2020-06-05 17:05:36; [cost=0.752721ms] result=@String[1ee1149c15913479360831011d9c3c]

或者：

[arthas@39996]$ watch com.test.pandora.eagleeye.HomeController home '{params, @com.taobao.eagleeye.EagleEye@getTraceId()}'
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 49 ms, listenerId: 5
ts=2020-06-05 17:08:30; [cost=1.058038ms] result=@ArrayList[
    @Object[][isEmpty=true;size=0],
    @String[1ee1149c15913481104721013d9c3c],
]

trace

trace 命令会自动打印 eagleeye的traceId，比如：

[arthas@39996]$ trace com.test.pandora.eagleeye.HomeController home
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 70 ms, listenerId: 2
`---ts=2020-06-05 17:03:40;thread_name=http-nio-7001-exec-7;id=77;is_daemon=true;priority=5;TCCL=org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedWebappClassLoader@5929021;trace_id=1ee1149c15913478208291007d9c3c;rpc_id=0
    `---[1.215536ms] com.test.pandora.eagleeye.HomeController:home()
        `---[0.882264ms] org.slf4j.Logger:info() #20