Merge pull request #4054 from mtanda/cloudwatch_template_dimension_fix

(cloudwatch) fix template replace in legend

public/app/plugins/datasource/cloudwatch/datasource.js

@@ -58,7 +58,7 @@ function (angular, _, moment, dateMath) {
         var result = [];
 
         _.each(allResponse, function(response, index) {
-          var metrics = transformMetricData(response, options.targets[index]);
+          var metrics = transformMetricData(response, options.targets[index], options.scopedVars);
           result = result.concat(metrics);
         });
 
@@ -302,15 +302,21 @@ function (angular, _, moment, dateMath) {
       return this.defaultRegion;
     };
 
-    function transformMetricData(md, options) {
+    function transformMetricData(md, options, scopedVars) {
       var aliasRegex = /\{\{(.+?)\}\}/g;
       var aliasPattern = options.alias || '{{metric}}_{{stat}}';
       var aliasData = {
-        region: templateSrv.replace(options.region),
-        namespace: templateSrv.replace(options.namespace),
-        metric: templateSrv.replace(options.metricName),
+        region: templateSrv.replace(options.region, scopedVars),
+        namespace: templateSrv.replace(options.namespace, scopedVars),
+        metric: templateSrv.replace(options.metricName, scopedVars),
       };
-      _.extend(aliasData, options.dimensions);
+      var aliasDimensions = {};
+      _.each(_.keys(options.dimensions), function(origKey) {
+        var key = templateSrv.replace(origKey, scopedVars);
+        var value = templateSrv.replace(options.dimensions[origKey], scopedVars);
+        aliasDimensions[key] = value;
+      });
+      _.extend(aliasData, aliasDimensions);
 
       var periodMs = options.period * 1000;
       return _.map(options.statistics, function(stat) {