Revert "feat: add zone to other metrics"

This reverts commit a37cb70.

lib/queue-server.js

@@ -18,17 +18,15 @@ const deliveryStatusCounter = new promClient.Counter({
 const messagePushCounter = new promClient.Counter({
     name: 'zonemta_message_push',
     help: 'Messages pushed to queue',
-    labelNames: ['result', 'zone']
+    labelNames: ['result']
 });
 const bounceCounter = new promClient.Counter({
     name: 'zonemta_bounce_generation',
-    help: 'Bounce generation',
-    labelNames: ['zone']
+    help: 'Bounce generation'
 });
 const dropCounter = new promClient.Counter({
     name: 'zonemta_message_drop',
-    help: 'Messages dropped',
-    labelNames: ['zone']
+    help: 'Messages dropped'
 });
 
 const promMetrics = {
@@ -215,9 +213,7 @@ class QueueServer {
 
                     case 'BOUNCE':
                         {
-                            bounceCounter.inc({
-                                zone: client.zone.name
-                            });
+                            bounceCounter.inc();
                             const bounce = data;
                             bounce.headers = new Headers(bounce.headers || []);
                             plugins.handler.runHooks(
@@ -234,9 +230,7 @@ class QueueServer {
                         break;
 
                     case 'REMOVE':
-                        dropCounter.inc({
-                            zone: client.zone.name
-                        });
+                        dropCounter.inc();
                         this.queue.removeMessage(data.id, err => {
                             if (!client) {
                                 // client already errored or closed
@@ -296,8 +290,7 @@ class QueueServer {
                     case 'PUSH':
                         this.queue.push(data.id, data.envelope, err => {
                             messagePushCounter.inc({
-                                result: err ? 'fail' : 'success',
-                                zone: client.zone.name
+                                result: err ? 'fail' : 'success'
                             });
                             if (!client) {
                                 // client already errored or closed