upgrade to most recent metrics

services/docstore/package.json

@@ -10,7 +10,7 @@
   "dependencies": {
     "settings-sharelatex": "git+https://github.com/sharelatex/settings-sharelatex.git#v1.0.0",
     "logger-sharelatex": "git+https://github.com/sharelatex/logger-sharelatex.git#v1.4.0",
-    "metrics-sharelatex": "git+https://github.com/sharelatex/metrics-sharelatex.git#v1.7.0",
+    "metrics-sharelatex": "git+https://github.com/sharelatex/metrics-sharelatex.git#v1.7.1",
     "mongojs": "0.18.2",
     "express": "~4.1.1",
     "underscore": "~1.6.0",