add option to add tags to all stats

Author: respectTheCode

lib/index.js

@@ -3,6 +3,7 @@ var DD = require("node-dogstatsd").StatsD;
 module.exports = function (options) {
 	var datadog = options.dogstatsd || new DD();
 	var stat = options.stat || "node.express.router";
+	var tags = options.tags || [];
 
 	return function (req, res, next) {
 		if (!req._startTime) {
@@ -21,7 +22,7 @@ module.exports = function (options) {
 			datadog.histogram(stat, (new Date() - req._startTime), 1, [
 				"route:" + req.route.path,
 				"path:" + req.path
-			]);
+			].concat(tags));
 		};
 
 		next();