fix charts scroll handle icon

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

@@ -126,7 +126,7 @@ export default {
           },
         },
         series: this.scatterSeries,
-        dataZoom: this.dataZoomConfig,
+        dataZoom: [this.dataZoomConfig],
       };
     },
     dataZoomConfig() {

changelogs/unreleased/64385-charts-scroll-handle-icon-has-disappeared.yml

+---
+title: fix charts scroll handle icon to use gitlab svg
+merge_request: 31825
+author:
+type: fixed

spec/javascripts/monitoring/charts/area_spec.js

@@ -225,6 +225,14 @@ describe('Area component', () => {
     });
 
     describe('chartOptions', () => {
+      describe('dataZoom', () => {
+        it('contains an svg object within an array to properly render icon', () => {
+          const dataZoomObject = [{}];
+
+          expect(areaChart.vm.chartOptions.dataZoom).toEqual(dataZoomObject);
+        });
+      });
+
       describe('yAxis formatter', () => {
         let format;