Fix race in mock mode and address frontend type checks

frontend-modern/src/pages/__tests__/Alerts.helpers.test.ts

@@ -12,11 +12,11 @@ import {
   pathForTab,
   tabFromPath,
 } from '../Alerts';
+import type { RawOverrideConfig } from '@/types/alerts';
 
 describe('normalizeMetricDelayMap', () => {
   it('returns empty object when input is nullish', () => {
     expect(normalizeMetricDelayMap(undefined)).toEqual({});
-    // @ts-expect-error - testing runtime null handling
     expect(normalizeMetricDelayMap(null)).toEqual({});
   });
 
@@ -139,17 +139,19 @@ describe('threshold helper utilities', () => {
   it('extracts trigger values and ignores non-threshold keys', () => {
     const result = extractTriggerValues({
       cpu: { trigger: 80, clear: 70 },
-      memory: 85,
+      memory: { trigger: 85, clear: 75 },
       disabled: true,
       poweredOffSeverity: 'warning',
-      networkIn: false,
+      customFlag: true,
+      customLegacy: 42,
       label: 'ignored',
-    });
+    } as RawOverrideConfig);
 
     expect(result).toEqual({
       cpu: 80,
       memory: 85,
-      networkIn: 0,
+      customFlag: 0,
+      customLegacy: 42,
     });
   });
 

internal/mock/integration.go

@@ -120,29 +120,31 @@ func disableMockMode() {
 
 func startUpdateLoopLocked() {
 	stopUpdateLoopLocked()
-	stopUpdatesCh = make(chan struct{})
+	stopCh := make(chan struct{})
-	updateTicker = time.NewTicker(updateInterval)
+	ticker := time.NewTicker(updateInterval)
+	stopUpdatesCh = stopCh
+	updateTicker = ticker
 
-	go func() {
+	go func(stop <-chan struct{}, tick *time.Ticker) {
 		for {
 			select {
-			case <-updateTicker.C:
+			case <-tick.C:
 				cfg := GetConfig()
 				updateMetrics(cfg)
-			case <-stopUpdatesCh:
+			case <-stop:
 				return
 			}
 		}
-	}()
+	}(stopCh, ticker)
 }
 
 func stopUpdateLoopLocked() {
-	if updateTicker != nil {
+	if ticker := updateTicker; ticker != nil {
-		updateTicker.Stop()
+		ticker.Stop()
 		updateTicker = nil
 	}
-	if stopUpdatesCh != nil {
+	if ch := stopUpdatesCh; ch != nil {
-		close(stopUpdatesCh)
+		close(ch)
 		stopUpdatesCh = nil
 	}
 }