Avoid to use "pubsub" for the name of modules, middlewares, variables, etc..

lib/api/map/preview-template-controller.js

@@ -12,7 +12,7 @@ const lastModifiedHeader = require('../middlewares/last-modified-header');
 const checkStaticImageFormat = require('../middlewares/check-static-image-format');
 const rateLimit = require('../middlewares/rate-limit');
 const { RATE_LIMIT_ENDPOINTS_GROUPS } = rateLimit;
-const metrics = require('../middlewares/pubsub-metrics');
+const metrics = require('../middlewares/metrics');
 
 const DEFAULT_ZOOM_CENTER = {
     zoom: 1,