Export metrics in setup; so it also works after reload (#1715)

* brr; a sleep

* Shouldnt need a query

plugin/metrics/metrics.go

@@ -5,10 +5,8 @@ import (
 	"net"
 	"net/http"
 	"os"
-	"runtime"
 	"sync"
 
-	"github.com/coredns/coredns/coremain"
 	"github.com/coredns/coredns/plugin"
 	"github.com/coredns/coredns/plugin/metrics/vars"
 	"github.com/coredns/coredns/plugin/pkg/log"
@@ -52,9 +50,6 @@ func New(addr string) *Metrics {
 	met.MustRegister(vars.ResponseSize)
 	met.MustRegister(vars.ResponseRcode)
 
-	// Initialize metrics.
-	buildInfo.WithLabelValues(coremain.CoreVersion, coremain.GitCommit, runtime.Version()).Set(1)
-
 	return met
 }
 

plugin/metrics/setup.go

@@ -2,8 +2,10 @@ package metrics
 
 import (
 	"net"
+	"runtime"
 
 	"github.com/coredns/coredns/core/dnsserver"
+	"github.com/coredns/coredns/coremain"
 	"github.com/coredns/coredns/plugin"
 
 	"github.com/mholt/caddy"
@@ -39,6 +41,9 @@ func setup(c *caddy.Controller) error {
 	c.OnRestart(m.OnRestart)
 	c.OnFinalShutdown(m.OnFinalShutdown)
 
+	// Initialize metrics.
+	buildInfo.WithLabelValues(coremain.CoreVersion, coremain.GitCommit, runtime.Version()).Set(1)
+
 	return nil
 }
 

test/reload_test.go

@@ -5,6 +5,7 @@ import (
 	"io/ioutil"
 	"net/http"
 	"testing"
+	"time"
 
 	"github.com/miekg/dns"
 )
@@ -93,13 +94,7 @@ func TestReloadMetricsHealth(t *testing.T) {
 	}
 	defer c1.Stop()
 
-	// Send query to trigger monitoring to export on the new process
-	udp, _ := CoreDNSServerPorts(c1, 0)
-	m := new(dns.Msg)
-	m.SetQuestion("example.org.", dns.TypeA)
-	if _, err := dns.Exchange(m, udp); err != nil {
-		t.Fatal(err)
-	}
+	time.Sleep(1 * time.Second)
 
 	// Health
 	resp, err := http.Get("http://localhost:53184/health")