add gc to filestore

services/filestore/app.coffee

@@ -14,6 +14,7 @@ Metrics = require "metrics-sharelatex"
 Metrics.initialize("filestore")
 Metrics.open_sockets.monitor(logger)
 Metrics.event_loop?.monitor(logger)
+Metrics.memory.monitor(logger)
 
 app.configure ->
 	app.use express.bodyParser()