Fix tooltip unit when legend isn't shown (#10348)

* graph: fix tooltip unit when legend isn't shown, #10311

* fix broken tests (updateLegendValues() function)

public/app/core/time_series2.ts

@@ -28,9 +28,10 @@ export function updateLegendValues(data: TimeSeries[], panel) {
   for (let i = 0; i < data.length; i++) {
     let series = data[i];
     let yaxes = panel.yaxes;
-    let axis = yaxes[series.yaxis - 1];
+    const seriesYAxis = series.yaxis || 1;
+    let axis = yaxes[seriesYAxis - 1];
     let { tickDecimals, scaledDecimals } = getFlotTickDecimals(data, axis);
-    let formater = kbn.valueFormats[panel.yaxes[series.yaxis - 1].format];
+    let formater = kbn.valueFormats[panel.yaxes[seriesYAxis - 1].format];
 
     // decimal override
     if (_.isNumber(panel.decimals)) {

public/app/plugins/panel/graph/graph.ts

@@ -13,7 +13,7 @@ import _ from 'lodash';
 import moment from 'moment';
 import kbn from 'app/core/utils/kbn';
 import { tickStep } from 'app/core/utils/ticks';
-import { appEvents, coreModule } from 'app/core/core';
+import { appEvents, coreModule, updateLegendValues } from 'app/core/core';
 import GraphTooltip from './graph_tooltip';
 import { ThresholdManager } from './threshold_manager';
 import { EventManager } from 'app/features/annotations/all';
@@ -62,6 +62,8 @@ function graphDirective(timeSrv, popoverSrv, contextSrv) {
         }
         annotations = ctrl.annotations || [];
         buildFlotPairs(data);
+        updateLegendValues(data, panel);
+
         ctrl.events.emit('render-legend');
       });
 

public/app/plugins/panel/graph/legend.ts

@@ -2,7 +2,6 @@ import angular from 'angular';
 import _ from 'lodash';
 import $ from 'jquery';
 import PerfectScrollbar from 'perfect-scrollbar';
-import { updateLegendValues } from 'app/core/core';
 
 var module = angular.module('grafana.directives');
 
@@ -31,10 +30,6 @@ module.directive('graphLegend', function(popoverSrv, $timeout) {
         ctrl.events.emit('legend-rendering-complete');
       });
 
-      function updateLegendDecimals() {
-        updateLegendValues(data, panel);
-      }
-
       function getSeriesIndexForElement(el) {
         return el.parents('[data-series-index]').data('series-index');
       }
@@ -166,10 +161,7 @@ module.directive('graphLegend', function(popoverSrv, $timeout) {
         // render first time for getting proper legend height
         if (!panel.legend.rightSide) {
           renderLegendElement(tableHeaderElem);
-          updateLegendDecimals();
           elem.empty();
-        } else {
-          updateLegendDecimals();
         }
 
         renderLegendElement(tableHeaderElem);