度量 (metrics)
metrics 端点提供对应用程序指标的访问,以诊断应用程序记录的指标。此端点不应在生产中“抓取”或用作指标后端。其目的是显示当前注册的指标,以便用户可以看到哪些指标可用、它们当前的值是多少,以及触发某些操作是否会导致某些值发生变化。如果您想通过收集的指标诊断您的应用程序,您应该使用外部指标后端。在这种情况下,metrics 端点仍然很有用。
检索指标名称
要检索可用指标的名称,请向 /actuator/metrics 发出 GET 请求,如以下基于 curl 的示例所示
$ curl 'https://:8080/actuator/metrics' -i -X GET
结果响应类似于以下内容
HTTP/1.1 200 OK
Content-Type: application/vnd.spring-boot.actuator.v3+json
Content-Length: 154
{
"names" : [ "jvm.buffer.count", "jvm.buffer.memory.used", "jvm.buffer.total.capacity", "jvm.memory.committed", "jvm.memory.max", "jvm.memory.used" ]
}
检索指标
要检索指标,请向 /actuator/metrics/{metric.name} 发出 GET 请求,如以下基于 curl 的示例所示
$ curl 'https://:8080/actuator/metrics/jvm.memory.max' -i -X GET
前面的示例检索名为 jvm.memory.max 的指标信息。生成的响应与以下内容类似
HTTP/1.1 200 OK
Content-Disposition: inline;filename=f.txt
Content-Type: application/vnd.spring-boot.actuator.v3+json
Content-Length: 555
{
"availableTags" : [ {
"tag" : "area",
"values" : [ "heap", "nonheap" ]
}, {
"tag" : "id",
"values" : [ "CodeHeap 'profiled nmethods'", "G1 Old Gen", "CodeHeap 'non-profiled nmethods'", "G1 Survivor Space", "Compressed Class Space", "Metaspace", "G1 Eden Space", "CodeHeap 'non-nmethods'" ]
} ],
"baseUnit" : "bytes",
"description" : "The maximum amount of memory in bytes that can be used for memory management",
"measurements" : [ {
"statistic" : "VALUE",
"value" : 2.936012797E9
} ],
"name" : "jvm.memory.max"
}
向下钻取
要向下钻取指标,请使用 tag 查询参数向 /actuator/metrics/{metric.name} 发出 GET 请求,如以下基于 curl 的示例所示
$ curl 'https://:8080/actuator/metrics/jvm.memory.max?tag=area%3Anonheap&tag=id%3ACompressed+Class+Space' -i -X GET
前面的示例检索 jvm.memory.max 指标,其中 area 标签的值为 nonheap,id 属性的值为 Compressed Class Space。生成的响应与以下内容类似
HTTP/1.1 200 OK
Content-Disposition: inline;filename=f.txt
Content-Type: application/vnd.spring-boot.actuator.v3+json
Content-Length: 263
{
"availableTags" : [ ],
"baseUnit" : "bytes",
"description" : "The maximum amount of memory in bytes that can be used for memory management",
"measurements" : [ {
"statistic" : "VALUE",
"value" : 1.073741824E9
} ],
"name" : "jvm.memory.max"
}