session_id for metrics

dnsstat.go

@@ -3,6 +3,8 @@ package dnsstat
 import (
 	"context"
 
+	"github.com/google/uuid"
+
 	"github.com/coredns/caddy"
 	"github.com/coredns/coredns/core/dnsserver"
 	"github.com/coredns/coredns/plugin"
@@ -19,7 +21,13 @@ type DNSStat struct {
 	Next plugin.Handler
 }
 
-func init() { plugin.Register("dnsstat", setup) }
+// Session ID for current run for future better log partitioning in prometheus
+var sessionID string
+
+func init() {
+	sessionID = uuid.New().String()
+	plugin.Register("dnsstat", setup)
+}
 
 // Register
 func setup(c *caddy.Controller) error {
@@ -49,6 +57,7 @@ var requestCount = promauto.NewCounterVec(prometheus.CounterOpts{
 	"type",
 	"name",
 	"client_ip",
+	"session_id",
 })
 
 // ServeDNS implements the plugin.Handler interface.
@@ -61,6 +70,7 @@ func (d DNSStat) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg)
 		state.Type(),
 		state.Name(),
 		state.IP(),
+		sessionID,
 	).Inc()
 	return plugin.NextOrFailure(d.Name(), d.Next, ctx, w, r)
 }