fix: Fix excessive ls-remote requests on monorepos with Auto Sync enabled apps (26277) (#26278)

Signed-off-by: Eugene Doudine <eugene.doudine@octopus.com>
Co-authored-by: Dan Garfield <dan.garfield@octopus.com>

controller/appcontroller.go

@@ -1560,8 +1560,18 @@ func (ctrl *ApplicationController) processRequestedAppOperation(app *appv1.Appli
 		// if we just completed an operation, force a refresh so that UI will report up-to-date
 		// sync/health information
 		if _, err := cache.MetaNamespaceKeyFunc(app); err == nil {
-			// force app refresh with using CompareWithLatest comparison type and trigger app reconciliation loop
-			ctrl.requestAppRefresh(app.QualifiedName(), CompareWithLatestForceResolve.Pointer(), nil)
+			var compareWith CompareWith
+			if state.Operation.InitiatedBy.Automated {
+				// Do not force revision resolution on automated operations because
+				// this would cause excessive Ls-Remote requests on monorepo commits
+				compareWith = CompareWithLatest
+			} else {
+				// Force app refresh with using most recent resolved revision after sync,
+				// so UI won't show a just synced application being out of sync if it was
+				// synced after commit but before app. refresh (see #18153)
+				compareWith = CompareWithLatestForceResolve
+			}
+			ctrl.requestAppRefresh(app.QualifiedName(), compareWith.Pointer(), nil)
 		} else {
 			logCtx.WithError(err).Warn("Fails to requeue application")
 		}

controller/appcontroller_test.go

@@ -2557,6 +2557,41 @@ func TestProcessRequestedAppOperation_Successful(t *testing.T) {
 	assert.Equal(t, CompareWithLatestForceResolve, level)
 }
 
+func TestProcessRequestedAppAutomatedOperation_Successful(t *testing.T) {
+	app := newFakeApp()
+	app.Spec.Project = "default"
+	app.Operation = &v1alpha1.Operation{
+		Sync: &v1alpha1.SyncOperation{},
+		InitiatedBy: v1alpha1.OperationInitiator{
+			Automated: true,
+		},
+	}
+	ctrl := newFakeController(t.Context(), &fakeData{
+		apps: []runtime.Object{app, &defaultProj},
+		manifestResponses: []*apiclient.ManifestResponse{{
+			Manifests: []string{},
+		}},
+	}, nil)
+	fakeAppCs := ctrl.applicationClientset.(*appclientset.Clientset)
+	receivedPatch := map[string]any{}
+	fakeAppCs.PrependReactor("patch", "*", func(action kubetesting.Action) (handled bool, ret runtime.Object, err error) {
+		if patchAction, ok := action.(kubetesting.PatchAction); ok {
+			require.NoError(t, json.Unmarshal(patchAction.GetPatch(), &receivedPatch))
+		}
+		return true, &v1alpha1.Application{}, nil
+	})
+
+	ctrl.processRequestedAppOperation(app)
+
+	phase, _, _ := unstructured.NestedString(receivedPatch, "status", "operationState", "phase")
+	message, _, _ := unstructured.NestedString(receivedPatch, "status", "operationState", "message")
+	assert.Equal(t, string(synccommon.OperationSucceeded), phase)
+	assert.Equal(t, "successfully synced (no more tasks)", message)
+	ok, level := ctrl.isRefreshRequested(ctrl.toAppKey(app.Name))
+	assert.True(t, ok)
+	assert.Equal(t, CompareWithLatest, level)
+}
+
 func TestProcessRequestedAppOperation_SyncTimeout(t *testing.T) {
 	testCases := []struct {
 		name            string