Address missing colors on the monitoring dashboards

This resolves the missing orange, purple and green colors
on charts that have more than one metrics series

app/assets/javascripts/monitoring/components/charts/time_series.vue

@@ -14,6 +14,7 @@ import {
   lineWidths,
   symbolSizes,
   dateFormats,
+  chartColorValues,
 } from '../../constants';
 import { makeDataSeries } from '~/helpers/monitor_helper';
 import { graphDataValidatorForValues } from '../../utils';
@@ -124,7 +125,7 @@ export default {
       // Transforms & supplements query data to render appropriate labels & styles
       // Input: [{ queryAttributes1 }, { queryAttributes2 }]
       // Output: [{ seriesAttributes1 }, { seriesAttributes2 }]
-      return this.graphData.metrics.reduce((acc, query) => {
+      return this.graphData.metrics.reduce((acc, query, i) => {
         const { appearance } = query;
         const lineType =
           appearance && appearance.line && appearance.line.type
@@ -145,7 +146,7 @@ export default {
           lineStyle: {
             type: lineType,
             width: lineWidth,
-            color: this.primaryColor,
+            color: chartColorValues[i % chartColorValues.length],
           },
           showSymbol: false,
           areaStyle: this.graphData.type === 'area-chart' ? areaStyle : undefined,

app/assets/javascripts/monitoring/constants.js

@@ -70,6 +70,13 @@ export const colorValues = {
   anomalyAreaColor: '#1f78d1',
 };
 
+export const chartColorValues = [
+  '#1f78d1', // $blue-500 (see variables.scss)
+  '#1aaa55', // $green-500
+  '#fc9403', // $orange-500
+  '#6d49cb', // $purple
+];
+
 export const lineTypes = {
   default: 'solid',
 };

changelogs/unreleased/jivanvl-address-missing-colors-chart-panels.yml

+---
+title: Add missing colors on the monitoring dashboards
+merge_request: 24921
+author:
+type: fixed

spec/frontend/monitoring/components/charts/time_series_spec.js

@@ -3,6 +3,7 @@ import { setTestTimeout } from 'helpers/timeout';
 import { GlLink } from '@gitlab/ui';
 import { GlAreaChart, GlLineChart, GlChartSeriesLabel } from '@gitlab/ui/dist/charts';
 import { shallowWrapperContainsSlotText } from 'helpers/vue_test_utils_helper';
+import { chartColorValues } from '~/monitoring/constants';
 import { createStore } from '~/monitoring/stores';
 import TimeSeries from '~/monitoring/components/charts/time_series.vue';
 import * as types from '~/monitoring/stores/mutation_types';
@@ -315,6 +316,10 @@ describe('Time series component', () => {
         it('formats line width correctly', () => {
           expect(chartData[0].lineStyle.width).toBe(2);
         });
+
+        it('formats line color correctly', () => {
+          expect(chartData[0].lineStyle.color).toBe(chartColorValues[0]);
+        });
       });
 
       describe('chartOptions', () => {