flipped series and when keys

app/assets/javascripts/monitoring/utils/multiple_time_series.js

@@ -68,8 +68,8 @@ export default function createTimeSeries(queryData, graphWidth, graphHeight, gra
       .y1(d => timeSeriesScaleY(d.value));
 
     const timeSeriesMetricLabel = timeSeries.metric[Object.keys(timeSeries.metric)[0]];
-    const seriesCustomizationData = queryData.when != null &&
-                                    _.findWhere(queryData.when[0].series,
+    const seriesCustomizationData = queryData.series != null &&
+                                    _.findWhere(queryData.series[0].when,
                                     { value: timeSeriesMetricLabel });
     if (seriesCustomizationData != null) {
       metricTag = seriesCustomizationData.value || timeSeriesMetricLabel;