The metrics endpoint shows some of the important metrics about the following:

• Server--free memory, processors, uptime, and so on
• JVM--details about the ;heap, threads, garbage collection, sessions, and so on
• Responses provided by application services

An extract from the ;response of the ;/application/metrics endpoint is shown as follows:

{
 "mem": 481449,
 "mem.free": 178878,
 "processors": 4,
 "instance.uptime": 1853761,
 "uptime": 1863728,
 "systemload.average": 2.3349609375,
 "heap.committed": 413696,
 "heap.init": 65536,
 "heap.used": 234817,
 "heap": 932352,
 "nonheap.committed": 69248,
 "nonheap.init": 2496,
 "nonheap.used": 67754,
 "nonheap": 0,
 "threads.peak": 23,
 "threads.daemon": 21,
 "threads.totalStarted": 30,
 "threads": 23,
 "classes": 8077,
 "classes.loaded": 8078,
 "classes.unloaded": 1,
 "gc.ps_scavenge.count": 15,
 "gc.ps_scavenge.time": 242,
 "gc.ps_marksweep.count": 3,
 "gc.ps_marksweep.time": 543,
 "httpsessions.max": -1,
 "httpsessions.active": 0,
 "gauge.response.actuator": 8,
 "gauge.response.mappings": 12,
 "gauge.response.beans": 83,
 "gauge.response.health": 14,
 "gauge.response.root": 9,
 "gauge.response.heapdump": 4694,
 "gauge.response.env": 6,
 "gauge.response.profile": 12,
 "gauge.response.browser.star-star": 10,
 "gauge.response.actuator.root": 2,
 "gauge.response.configprops": 272,
 "gauge.response.actuator.star-star": 13,
 "counter.status.200.profile": 1,
 "counter.status.200.actuator": 8,
 "counter.status.200.mappings": 1,
 "counter.status.200.root": 5,
 "counter.status.200.configprops": 1,
 "counter.status.404.actuator.star-star": 3,
 "counter.status.200.heapdump": 1,
 "counter.status.200.health": 1,
 "counter.status.304.browser.star-star": 132,
 "counter.status.302.actuator.root": 4,
 "counter.status.200.browser.star-star": 37,
 "counter.status.200.env": 2,
 "counter.status.302.root": 5,
 "counter.status.200.beans": 1,
 "counter.status.200.actuator.star-star": 210,
 "counter.status.302.actuator": 1
 }