feat(singlestat): Added support for string values, Closes #2203

CHANGELOG.md

@@ -8,6 +8,7 @@
 - [Issue #590](https://github.com/grafana/grafana/issues/590).   Graph: Define series color using regex rule
 - [Issue #2162](https://github.com/grafana/grafana/issues/2162). Graph: New series style override, negative-y transform and stack groups
 - [Issue #2096](https://github.com/grafana/grafana/issues/2096). Dashboard list panel: Now supports search by multiple tags
+- [Issue #2203](https://github.com/grafana/grafana/issues/2203). Singlestat: Now support string values
 
 **User or Organization admin**
 - [Issue #1899](https://github.com/grafana/grafana/issues/1899). Organization: You can now update the organization user role directly (without removing and readding the organization user).

public/app/panels/singlestat/module.js

@@ -186,14 +186,21 @@ function (angular, app, _, TimeSeries, kbn, PanelMeta) {
       data.flotpairs = [];
 
       if ($scope.series && $scope.series.length > 0) {
+        var lastValue = _.last($scope.series[0].datapoints)[0];
+        if (_.isString(lastValue)) {
+          data.value = 0;
+          data.valueFormated = lastValue;
+          data.valueRounded = 0;
+        } else {
           data.value = $scope.series[0].stats[$scope.panel.valueName];
           data.flotpairs = $scope.series[0].flotpairs;
-      }
 
           var decimalInfo = $scope.getDecimalsForValue(data.value);
           var formatFunc = kbn.valueFormats[$scope.panel.format];
           data.valueFormated = formatFunc(data.value, decimalInfo.decimals, decimalInfo.scaledDecimals);
           data.valueRounded = kbn.roundValue(data.value, decimalInfo.decimals);
+        }
+      }
 
       // check value to text mappings
       for(var i = 0; i < $scope.panel.valueMaps.length; i++) {

public/app/plugins/datasource/influxdb/influxSeries.js

@@ -41,9 +41,11 @@ function (_) {
         }
 
         var datapoints = [];
+        if (series.values) {
           for (i = 0; i < series.values.length; i++) {
             datapoints[i] = [series.values[i][j], series.values[i][0]];
           }
+        }
 
         output.push({ target: seriesName, datapoints: datapoints});
       }