[Part 1] test: marker commit to simulate ANC hotfix cherry-pick (dry run) (#8590)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Devinwong

aks-node-controller/app.go

@@ -134,6 +134,20 @@ func (a *App) Run(ctx context.Context, args []string) int {
 func (a *App) runProvisionCommand(ctx context.Context, flags ProvisionFlags, dryRun bool) error {
 	slog.Info("aks-node-controller started", "task", "Provision")
 
+	// Dry-run beacon for the official/v20260514 ANC hotfix end-to-end validation.
+	// Emitted both to slog (journalctl -u aks-node-controller.service,
+	// /var/log/azure/aks-node-controller.log) AND as a GuestAgent event so the
+	// signal surfaces in Azure telemetry / Kusto without needing SSH access.
+	// The hotfix-installed binary will emit this; the VHD-baked 202605.14.0 binary will not.
+	beaconNow := time.Now()
+	slog.Info("ANC hotfix dry-run beacon",
+		"version", Version,
+		"branch", "official/v20260514",
+		"hotfixTag", "anc/v202605.14.1")
+	a.eventLogger.LogEvent("HotfixBeacon",
+		fmt.Sprintf("ANC hotfix dry-run beacon version=%s branch=official/v20260514 hotfixTag=anc/v202605.14.1", Version),
+		helpers.EventLevelInformational, beaconNow, beaconNow)
+
 	startTime := time.Now()
 	a.eventLogger.LogEvent("Provision", "Starting", helpers.EventLevelInformational, startTime, startTime)
 	provisionResult, err := a.runProvision(ctx, flags, dryRun)

aks-node-controller/app_test.go

@@ -178,9 +178,10 @@ func TestApp_Run(t *testing.T) {
 		assert.Equal(t, 0, exitCode)
 
 		events := tt.eventLogger.Events()
-		assert.Len(t, events, 2)
-		assert.Contains(t, events[0].Message, "Starting")
-		assert.Contains(t, events[1].Message, "Completed")
+		assert.Len(t, events, 3)
+		assert.Contains(t, events[0].Message, "ANC hotfix dry-run beacon")
+		assert.Contains(t, events[1].Message, "Starting")
+		assert.Contains(t, events[2].Message, "Completed")
 	})
 
 	t.Run("provision command with provision-config and nbc-cmd flag", func(t *testing.T) {
@@ -190,9 +191,10 @@ func TestApp_Run(t *testing.T) {
 		assert.Equal(t, 0, exitCode)
 
 		events := tt.eventLogger.Events()
-		assert.Len(t, events, 2)
-		assert.Contains(t, events[0].Message, "Starting")
-		assert.Contains(t, events[1].Message, "Completed")
+		assert.Len(t, events, 3)
+		assert.Contains(t, events[0].Message, "ANC hotfix dry-run beacon")
+		assert.Contains(t, events[1].Message, "Starting")
+		assert.Contains(t, events[2].Message, "Completed")
 	})
 
 	t.Run("provision command with command runner error", func(t *testing.T) {
@@ -203,8 +205,8 @@ func TestApp_Run(t *testing.T) {
 		assert.Equal(t, 666, exitCode)
 
 		events := tt.eventLogger.Events()
-		assert.Len(t, events, 2)
-		assert.Equal(t, "Error", events[1].EventLevel)
+		assert.Len(t, events, 3)
+		assert.Equal(t, "Error", events[2].EventLevel)
 	})
 }
 

parts/linux/cloud-init/nodecustomdata.yml

@@ -25,6 +25,18 @@ write_files:
     Any overridden files will be listed here - Hotfix mode
     Example: {{GetCSEHelpersScriptFilepath}}
 
+# Dry-run beacon for the official/v20260514 ANC hotfix end-to-end validation.
+# Greppable from the node via: cat /opt/azure/containers/anc-hotfix-dryrun-beacon.txt
+# Proves the nodecustomdata change reached the node (independent of the
+# auto-injected anc-hotfix block that targets aks-node-controller-hotfix.json).
+- path: /opt/azure/containers/anc-hotfix-dryrun-beacon.txt
+  permissions: "0644"
+  owner: root
+  content: |
+    anc-hotfix-dry-run beacon
+    branch: official/v20260514
+    hotfix-tag: anc/v202605.14.1
+
 {{if IsAKSCustomCloud}}
 - path: {{GetInitAKSCustomCloudFilepath}}
   permissions: "0744"