在 golang 的单独端口中公开 Prometheus 指标
Expose Prometheus metrics in a separate port in golang
在微服务 运行 gin-gonic 中，我试图在一个路由器中收集指标并将它们暴露在第二个路由器上，但似乎这是不可能的。有人有这方面的经验吗？
我找到的所有文档都将 prometheus 处理程序设置到同一个应用程序路由器中。
预期结果
看到 promhttp_metric_handler_requests_total{code="200"} 每次访问 :8000/test 路线增加
实际结果
promhttp_metric_handler_requests_total{code="200"} 每次访问 :7100/metrics 路由增加
示例代码
（以下是可以解释问题的完整应用程序）
package main
import (
"github.com/gin-gonic/gin"
"github.com/zsais/go-gin-prometheus"
"net/http"
)
func main() {
router1 := gin.New()
router1.GET("/test", func(c *gin.Context) {
c.String(http.StatusOK, "it works")
})
p := ginprometheus.NewPrometheus("test")
router1.Use(p.HandlerFunc())
router2 := gin.New()
p.SetMetricsPath(router2)
go func() { router2.Run(":7100") }()
router1.Run(":8000")
}
结果
前面代码的结果，在我加载了几次之后端点:8000/test如下，你可以看到命名空间test的统计数据是"empty"
# HELP go_gc_duration_seconds A summary of the GC invocation durations.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0.0"} 0.0
go_gc_duration_seconds{quantile="0.25"} 0.0
go_gc_duration_seconds{quantile="0.5"} 0.0
go_gc_duration_seconds{quantile="0.75"} 0.0
go_gc_duration_seconds{quantile="1.0"} 0.0
go_gc_duration_seconds_sum 0.0
go_gc_duration_seconds_count 0.0
# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 10.0
# HELP go_info Information about the Go environment.
# TYPE go_info gauge
go_info{version="go1.11.2"} 1.0
# HELP go_memstats_alloc_bytes Number of bytes allocated and still in use.
# TYPE go_memstats_alloc_bytes gauge
go_memstats_alloc_bytes 2.043376e+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 2.043376e+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 1.443509e+06
# HELP go_memstats_frees_total Total number of frees.
# TYPE go_memstats_frees_total counter
go_memstats_frees_total 374.0
# HELP go_memstats_gc_cpu_fraction The fraction of this program's available CPU time used by the GC since the program started.
# TYPE go_memstats_gc_cpu_fraction gauge
go_memstats_gc_cpu_fraction 0.0
# 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 2.234368e+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 2.043376e+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 6.3578112e+07
# 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 3.104768e+06
# HELP go_memstats_heap_objects Number of allocated objects.
# TYPE go_memstats_heap_objects gauge
go_memstats_heap_objects 6219.0
# 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 8192.0
# 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 6.668288e+07
# 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 0.0
# HELP go_memstats_lookups_total Total number of pointer lookups.
# TYPE go_memstats_lookups_total counter
go_memstats_lookups_total 0.0
# HELP go_memstats_mallocs_total Total number of mallocs.
# TYPE go_memstats_mallocs_total counter
go_memstats_mallocs_total 6593.0
# 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 6912.0
# 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 16384.0
# 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 33592.0
# 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 49152.0
# 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 4.473924e+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 1.038915e+06
# 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 425984.0
# 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 425984.0
# HELP go_memstats_sys_bytes Number of bytes obtained from system.
# TYPE go_memstats_sys_bytes gauge
go_memstats_sys_bytes 7.1891192e+07
# HELP go_threads Number of OS threads created.
# TYPE go_threads gauge
go_threads 7.0
# 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 1.0
# 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"} 1.0
promhttp_metric_handler_requests_total{code="500"} 0.0
promhttp_metric_handler_requests_total{code="503"} 0.0
# HELP test_request_duration_seconds The HTTP request latencies in seconds.
# TYPE test_request_duration_seconds summary
test_request_duration_seconds{quantile="0.5"} NaN
test_request_duration_seconds{quantile="0.9"} NaN
test_request_duration_seconds{quantile="0.99"} NaN
test_request_duration_seconds_sum 0.0
test_request_duration_seconds_count 0.0
# HELP test_request_size_bytes The HTTP request sizes in bytes.
# TYPE test_request_size_bytes summary
test_request_size_bytes{quantile="0.5"} NaN
test_request_size_bytes{quantile="0.9"} NaN
test_request_size_bytes{quantile="0.99"} NaN
test_request_size_bytes_sum 0.0
test_request_size_bytes_count 0.0
# HELP test_response_size_bytes The HTTP response sizes in bytes.
# TYPE test_response_size_bytes summary
test_response_size_bytes{quantile="0.5"} NaN
test_response_size_bytes{quantile="0.9"} NaN
test_response_size_bytes{quantile="0.99"} NaN
test_response_size_bytes_sum 0.0
test_response_size_bytes_count 0.0
Prometheus 使用 promhttp_metric_XXXXX 收集有关自身的数据，here:
As you can gather from http://localhost:9090/metrics, one metric that Prometheus exports about itself is called promhttp_metric_handler_requests_total (the total number of /metrics requests the Prometheus server has served).
您要找的是 gin_requests_total，10 请求示例：
gin_requests_total{code="200",handler="main.main.func1",host="localhost:8000",method="GET",url="/test"} 10
检查 p.SetListenAddressWithRouter() 使用单独的路由器来公开指标。
编辑
我看到您将子系统命名为 "test"。所以，你应该寻找 test_XXXXX，准确地说，test_requests_total
感谢大家的努力寻找解决方案，我只是发现我在路由之后注册中间件：这样，在中间件之前声明的路由不是由同一个中间件"covered"
这段代码可以正常工作：
package main
import (
"github.com/gin-gonic/gin"
"github.com/zsais/go-gin-prometheus"
"net/http"
)
func main() {
router1 := gin.New()
router2 := gin.New()
p := ginprometheus.NewPrometheus("test")
router1.Use(p.HandlerFunc())
p.SetMetricsPath(router2)
router1.GET("/test", func(c *gin.Context) {
c.String(http.StatusOK, "it works")
})
go func() { router2.Run(":7100") }()
router1.Run(":8000")
}
在微服务 运行 gin-gonic 中，我试图在一个路由器中收集指标并将它们暴露在第二个路由器上，但似乎这是不可能的。有人有这方面的经验吗？
我找到的所有文档都将 prometheus 处理程序设置到同一个应用程序路由器中。
预期结果
看到 promhttp_metric_handler_requests_total{code="200"} 每次访问 :8000/test 路线增加
实际结果
promhttp_metric_handler_requests_total{code="200"} 每次访问 :7100/metrics 路由增加
示例代码
（以下是可以解释问题的完整应用程序）
package main
import (
"github.com/gin-gonic/gin"
"github.com/zsais/go-gin-prometheus"
"net/http"
)
func main() {
router1 := gin.New()
router1.GET("/test", func(c *gin.Context) {
c.String(http.StatusOK, "it works")
})
p := ginprometheus.NewPrometheus("test")
router1.Use(p.HandlerFunc())
router2 := gin.New()
p.SetMetricsPath(router2)
go func() { router2.Run(":7100") }()
router1.Run(":8000")
}
结果
前面代码的结果，在我加载了几次之后端点:8000/test如下，你可以看到命名空间test的统计数据是"empty"
# HELP go_gc_duration_seconds A summary of the GC invocation durations.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0.0"} 0.0
go_gc_duration_seconds{quantile="0.25"} 0.0
go_gc_duration_seconds{quantile="0.5"} 0.0
go_gc_duration_seconds{quantile="0.75"} 0.0
go_gc_duration_seconds{quantile="1.0"} 0.0
go_gc_duration_seconds_sum 0.0
go_gc_duration_seconds_count 0.0
# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 10.0
# HELP go_info Information about the Go environment.
# TYPE go_info gauge
go_info{version="go1.11.2"} 1.0
# HELP go_memstats_alloc_bytes Number of bytes allocated and still in use.
# TYPE go_memstats_alloc_bytes gauge
go_memstats_alloc_bytes 2.043376e+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 2.043376e+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 1.443509e+06
# HELP go_memstats_frees_total Total number of frees.
# TYPE go_memstats_frees_total counter
go_memstats_frees_total 374.0
# HELP go_memstats_gc_cpu_fraction The fraction of this program's available CPU time used by the GC since the program started.
# TYPE go_memstats_gc_cpu_fraction gauge
go_memstats_gc_cpu_fraction 0.0
# 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 2.234368e+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 2.043376e+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 6.3578112e+07
# 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 3.104768e+06
# HELP go_memstats_heap_objects Number of allocated objects.
# TYPE go_memstats_heap_objects gauge
go_memstats_heap_objects 6219.0
# 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 8192.0
# 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 6.668288e+07
# 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 0.0
# HELP go_memstats_lookups_total Total number of pointer lookups.
# TYPE go_memstats_lookups_total counter
go_memstats_lookups_total 0.0
# HELP go_memstats_mallocs_total Total number of mallocs.
# TYPE go_memstats_mallocs_total counter
go_memstats_mallocs_total 6593.0
# 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 6912.0
# 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 16384.0
# 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 33592.0
# 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 49152.0
# 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 4.473924e+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 1.038915e+06
# 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 425984.0
# 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 425984.0
# HELP go_memstats_sys_bytes Number of bytes obtained from system.
# TYPE go_memstats_sys_bytes gauge
go_memstats_sys_bytes 7.1891192e+07
# HELP go_threads Number of OS threads created.
# TYPE go_threads gauge
go_threads 7.0
# 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 1.0
# 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"} 1.0
promhttp_metric_handler_requests_total{code="500"} 0.0
promhttp_metric_handler_requests_total{code="503"} 0.0
# HELP test_request_duration_seconds The HTTP request latencies in seconds.
# TYPE test_request_duration_seconds summary
test_request_duration_seconds{quantile="0.5"} NaN
test_request_duration_seconds{quantile="0.9"} NaN
test_request_duration_seconds{quantile="0.99"} NaN
test_request_duration_seconds_sum 0.0
test_request_duration_seconds_count 0.0
# HELP test_request_size_bytes The HTTP request sizes in bytes.
# TYPE test_request_size_bytes summary
test_request_size_bytes{quantile="0.5"} NaN
test_request_size_bytes{quantile="0.9"} NaN
test_request_size_bytes{quantile="0.99"} NaN
test_request_size_bytes_sum 0.0
test_request_size_bytes_count 0.0
# HELP test_response_size_bytes The HTTP response sizes in bytes.
# TYPE test_response_size_bytes summary
test_response_size_bytes{quantile="0.5"} NaN
test_response_size_bytes{quantile="0.9"} NaN
test_response_size_bytes{quantile="0.99"} NaN
test_response_size_bytes_sum 0.0
test_response_size_bytes_count 0.0
Prometheus 使用 promhttp_metric_XXXXX 收集有关自身的数据，here:
As you can gather from http://localhost:9090/metrics, one metric that Prometheus exports about itself is called promhttp_metric_handler_requests_total (the total number of /metrics requests the Prometheus server has served).
您要找的是 gin_requests_total，10 请求示例：
gin_requests_total{code="200",handler="main.main.func1",host="localhost:8000",method="GET",url="/test"} 10
检查 p.SetListenAddressWithRouter() 使用单独的路由器来公开指标。
编辑
我看到您将子系统命名为 "test"。所以，你应该寻找 test_XXXXX，准确地说，test_requests_total
感谢大家的努力寻找解决方案，我只是发现我在路由之后注册中间件：这样，在中间件之前声明的路由不是由同一个中间件"covered"
这段代码可以正常工作：
package main
import (
"github.com/gin-gonic/gin"
"github.com/zsais/go-gin-prometheus"
"net/http"
)
func main() {
router1 := gin.New()
router2 := gin.New()
p := ginprometheus.NewPrometheus("test")
router1.Use(p.HandlerFunc())
p.SetMetricsPath(router2)
router1.GET("/test", func(c *gin.Context) {
c.String(http.StatusOK, "it works")
})
go func() { router2.Run(":7100") }()
router1.Run(":8000")
}