Fix broken cluster health dashboard

Monitoring dashboard component does not
handle cases where all_dashboards is not
present in the payload

app/assets/javascripts/monitoring/stores/actions.js

@@ -84,7 +84,10 @@ export const fetchDashboard = ({ state, dispatch }, params) => {
   return backOffRequest(() => axios.get(state.dashboardEndpoint, { params }))
     .then(resp => resp.data)
     .then(response => {
-      dispatch('receiveMetricsDashboardSuccess', { response, params });
+      dispatch('receiveMetricsDashboardSuccess', {
+        response,
+        params,
+      });
     })
     .catch(error => {
       dispatch('receiveMetricsDashboardFailure', error);

app/assets/javascripts/monitoring/stores/mutations.js

@@ -94,7 +94,7 @@ export default {
     state.emptyState = 'noData';
   },
   [types.SET_ALL_DASHBOARDS](state, dashboards) {
-    state.allDashboards = dashboards;
+    state.allDashboards = dashboards || [];
   },
   [types.SET_SHOW_ERROR_BANNER](state, enabled) {
     state.showErrorBanner = enabled;

changelogs/unreleased/36262-monitor-cluster-health-charts-does-not-load.yml

+---
+title: Fix broken monitor cluster health dashboard
+merge_request: 20120
+author:
+type: fixed