使用Golang prometheus展示自定义指标

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如何仅显示我的自定义 prometheus 指标而无需其他任何内容

我一直在尝试使用prometheus来监控go服务器 以此

wr.router.handle(urlmatrix, promhttp.handler()).methods(http.methodget)

我的端点是 /metrics

但是当我到达端点时，我收到了所有这些数据

# help go_gc_duration_seconds a summary of the pause duration of garbage collection cycles.
# type go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 0
go_gc_duration_seconds{quantile="0.25"} 0
go_gc_duration_seconds{quantile="0.5"} 0
go_gc_duration_seconds{quantile="0.75"} 0
go_gc_duration_seconds{quantile="1"} 0
go_gc_duration_seconds_sum 0
go_gc_duration_seconds_count 0
# help go_goroutines number of goroutines that currently exist.
# type go_goroutines gauge
go_goroutines 8
# help go_info information about the go environment.
# type go_info gauge
go_info{version="go1.18.4"} 1
# help go_memstats_alloc_bytes number of bytes allocated and still in use.
# type go_memstats_alloc_bytes gauge
go_memstats_alloc_bytes 3.427776e+06
# help go_memstats_alloc_bytes_total total number of bytes allocated, even if freed.
# type go_memstats_alloc_bytes_total counter
go_memstats_alloc_bytes_total 3.427776e+06
# help go_memstats_buck_hash_sys_bytes number of bytes used by the profiling bucket hash table.
# type go_memstats_buck_hash_sys_bytes gauge
go_memstats_buck_hash_sys_bytes 4805
# help go_memstats_frees_total total number of frees.
# type go_memstats_frees_total counter
go_memstats_frees_total 0
# help go_memstats_gc_sys_bytes number of bytes used for garbage collection system metadata.
# type go_memstats_gc_sys_bytes gauge
go_memstats_gc_sys_bytes 3.616496e+06
# help go_memstats_heap_alloc_bytes number of heap bytes allocated and still in use.
# type go_memstats_heap_alloc_bytes gauge
go_memstats_heap_alloc_bytes 3.427776e+06
# help go_memstats_heap_idle_bytes number of heap bytes waiting to be used.
# type go_memstats_heap_idle_bytes gauge
go_memstats_heap_idle_bytes 4.5056e+06
# help go_memstats_heap_inuse_bytes number of heap bytes that are in use.
# type go_memstats_heap_inuse_bytes gauge
go_memstats_heap_inuse_bytes 3.457024e+06
# help go_memstats_heap_objects number of allocated objects.
# type go_memstats_heap_objects gauge
go_memstats_heap_objects 17219
# help go_memstats_heap_released_bytes number of heap bytes released to os.
# type go_memstats_heap_released_bytes gauge
go_memstats_heap_released_bytes 4.5056e+06
# help go_memstats_heap_sys_bytes number of heap bytes obtained from system.
# type go_memstats_heap_sys_bytes gauge
go_memstats_heap_sys_bytes 7.962624e+06
# help go_memstats_last_gc_time_seconds number of seconds since 1970 of last garbage collection.
# type go_memstats_last_gc_time_seconds gauge
go_memstats_last_gc_time_seconds 0
# help go_memstats_lookups_total total number of pointer lookups.
# type go_memstats_lookups_total counter
go_memstats_lookups_total 0
# help go_memstats_mallocs_total total number of mallocs.
# type go_memstats_mallocs_total counter
go_memstats_mallocs_total 17219
# help go_memstats_mcache_inuse_bytes number of bytes in use by mcache structures.
# type go_memstats_mcache_inuse_bytes gauge
go_memstats_mcache_inuse_bytes 12000
# help go_memstats_mcache_sys_bytes number of bytes used for mcache structures obtained from system.
# type go_memstats_mcache_sys_bytes gauge
go_memstats_mcache_sys_bytes 15600
# help go_memstats_mspan_inuse_bytes number of bytes in use by mspan structures.
# type go_memstats_mspan_inuse_bytes gauge
go_memstats_mspan_inuse_bytes 46240
# help go_memstats_mspan_sys_bytes number of bytes used for mspan structures obtained from system.
# type go_memstats_mspan_sys_bytes gauge
go_memstats_mspan_sys_bytes 48960
# help go_memstats_next_gc_bytes number of heap bytes when next garbage collection will take place.
# type go_memstats_next_gc_bytes gauge
go_memstats_next_gc_bytes 4.194304e+06
# help go_memstats_other_sys_bytes number of bytes used for other system allocations.
# type go_memstats_other_sys_bytes gauge
go_memstats_other_sys_bytes 904747
# help go_memstats_stack_inuse_bytes number of bytes in use by the stack allocator.
# type go_memstats_stack_inuse_bytes gauge
go_memstats_stack_inuse_bytes 425984
# help go_memstats_stack_sys_bytes number of bytes obtained from system for stack allocator.
# type go_memstats_stack_sys_bytes gauge
go_memstats_stack_sys_bytes 425984
# help go_memstats_sys_bytes number of bytes obtained from system.
# type go_memstats_sys_bytes gauge
go_memstats_sys_bytes 1.2979216e+07
# help go_threads number of os threads created.
# type go_threads gauge
go_threads 7
# help promhttp_metric_handler_requests_in_flight current number of scrapes being served.
# type promhttp_metric_handler_requests_in_flight gauge
promhttp_metric_handler_requests_in_flight 1
# help promhttp_metric_handler_requests_total total number of scrapes by http status code.
# type promhttp_metric_handler_requests_total counter
promhttp_metric_handler_requests_total{code="200"} 0
promhttp_metric_handler_requests_total{code="500"} 0
promhttp_metric_handler_requests_total{code="503"} 0

所有这些都是 prometheus 中的默认 metrics 我只需要显示我一直在编写的自定义 prometheus 指标，

var Exchange = prometheus.NewCounterVec(
prometheus.CounterOpts{
    Name: "requests",
    Help: "show the requests id",
}, []string{"requests"})

func init() {
   prometheus.MustRegister(Exchange)
}

我只需要显示这些指标，而不显示默认指标 requests{requests="1111"} 1

正确答案

您可以替换默认使用基本指标进行检测的默认注册表：

defaultregistry := prometheus.newregistry()
prometheus.defaultregisterer = defaultregistry
prometheus.defaultgatherer = defaultregistry

由于 promhttp.handler() 还添加了检测，如果您不需要其他指标，也可以将其替换为：

promhttp.handlerfor(prometheus.defaultgatherer, promhttp.handleropts{})

查看演示上的完整测试代码：https://go.dev/play/p/R2hQEg4nSf9

演示中的示例代码仅添加一个指标：

$ curl localhost:3000/metrics 
# HELP namespace_one_counter_total Number of things counted.
# TYPE namespace_one_counter_total counter namespace_one_counter_total 7
$

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