Merge branch 'jivl-fix-timescale-prometheus-charts-overlapping' into 'master'

fix timescale prometheus charts overlapping

Closes #43458

See merge request gitlab-org/gitlab-ce!17657

app/assets/javascripts/monitoring/components/graph.vue

@@ -209,6 +209,7 @@
 
         const xAxis = d3.axisBottom()
           .scale(axisXScale)
+          .ticks(this.graphWidth / 120)
           .tickFormat(timeScaleFormat);
 
         const yAxis = d3.axisLeft()