(cloudwatch) custom metrics namespace support

pkg/api/cloudwatch/metrics.go

@@ -126,6 +126,11 @@ func handleGetNamespaces(req *cwRequest, c *middleware.Context) {
 	for key := range metricsMap {
 		keys = append(keys, key)
 	}
+	if customMetricsNamespaces, ok := req.DataSource.JsonData["customMetricsNamespaces"].(string); ok {
+		for _, key := range strings.Split(customMetricsNamespaces, ",") {
+			keys = append(keys, key)
+		}
+	}
 	sort.Sort(sort.StringSlice(keys))
 
 	result := []interface{}{}

public/app/plugins/datasource/cloudwatch/partials/config.html

@@ -29,5 +29,16 @@
 			</ul>
 			<div class="clearfix"></div>
 		</div>
+		<div class="tight-form">
+			<ul class="tight-form-list">
+				<li class="tight-form-item" style="width: 200px">
+					Custom Metrics namespace<tip>Namespaces of Custom Metrics</tip>
+				</li>
+				<li>
+					<input type="text" class="tight-form-input input-large last" ng-model='ctrl.current.jsonData.customMetricsNamespaces' placeholder="Namespace1,Namespace2"></input>
+				</li>
+			</ul>
+			<div class="clearfix"></div>
+		</div>
 	</div>
 </div>