cd node_exporter-1.3.1.linux-amd64
./node_exporter

curl 127.0.0.1:9100/metrics

job_name: example-job-name
metrics_path: /metrics
cvm_sd_configs:
- region: ap-guangzhou
  ports:
  - 9100
  filters:         
  - name: tag:Sample tag key
    values: 
    - Sample tag value
relabel_configs: 
- source_labels: [__meta_cvm_instance_state]
  regex: RUNNING
  action: keep
- regex: __meta_cvm_tag_(.*)
  replacement: $1
  action: labelmap
- source_labels: [__meta_cvm_region]
  target_label: region
  action: replace

package order

import (
 "github.com/prometheus/client_golang/prometheus"
 "github.com/prometheus/client_golang/prometheus/promauto"
)

// Define the counter object to be monitored
var (
 opsProcessed = promauto.NewCounterVec(prometheus.CounterOpts{
     Name: "order_service_processed_orders_total",
     Help: "The total number of processed orders",
 }, []string{"status"}) // Processing status
)

// Process the order
func makeOrder() {
 opsProcessed.WithLabelValues("success").Inc() // Success
 // opsProcessed.WithLabelValues("fail").Inc() // Failure

 // Order placement business logic
}

rate(order_service_processed_orders_total[5m])

package main

import (
 "net/http"

 "github.com/prometheus/client_golang/prometheus/promhttp"
)

func main() {
     // Business code

     // Expose Prometheus metrics in the HTTP service
     http.Handle("/metrics", promhttp.Handler())

     // Business code
}