chore(pkger): handle edge cases for telegraf configs that manifest from user interaction

closes: #17434

CHANGELOG.md

@@ -3,7 +3,8 @@
 ### Features
 
 1. [17934](https://github.com/influxdata/influxdb/pull/17934): Add ability to delete a stack and all the resources associated with it
-1. [17941](https://github.com/influxdata/influxdb/pull/17941): Encorce dns name compliance on all pkger resources' metadata.name field
+1. [17941](https://github.com/influxdata/influxdb/pull/17941): Enforce DNS name compliance on all pkger resources' metadata.name field
+1. [17989](https://github.com/influxdata/influxdb/pull/17989): Add stateful pkg management with stacks
 
 ### Bug Fixes
 

cmd/influxd/launcher/pkger_test.go

@@ -1361,6 +1361,42 @@ func TestLauncher_Pkger(t *testing.T) {
 					})
 				})
 			})
+
+			t.Run("when a user has deleted a telegraf config that was previously created by a stack", func(t *testing.T) {
+				testUserDeletedTelegraf := func(t *testing.T, actionFn func(t *testing.T, stackID influxdb.ID, initialObj pkger.Object, initialSum pkger.Summary)) {
+					t.Helper()
+
+					obj := newTelegrafObject("tele-1", "", "")
+					stackID, cleanup, initialSum := initializeStackPkg(t, newPkg(obj))
+					defer cleanup()
+
+					require.Len(t, initialSum.TelegrafConfigs, 1)
+					require.NotZero(t, initialSum.TelegrafConfigs[0].TelegrafConfig.ID)
+					resourceCheck.mustDeleteTelegrafConfig(t, initialSum.TelegrafConfigs[0].TelegrafConfig.ID)
+
+					actionFn(t, stackID, obj, initialSum)
+				}
+
+				t.Run("should create new resource when attempting to update", func(t *testing.T) {
+					testUserDeletedTelegraf(t, func(t *testing.T, stackID influxdb.ID, initialObj pkger.Object, initialSum pkger.Summary) {
+						pkg := newPkg(initialObj)
+						updateSum, _, err := svc.Apply(ctx, l.Org.ID, l.User.ID, pkg, pkger.ApplyWithStackID(stackID))
+						require.NoError(t, err)
+
+						require.Len(t, updateSum.TelegrafConfigs, 1)
+						initial, updated := initialSum.TelegrafConfigs[0].TelegrafConfig, updateSum.TelegrafConfigs[0].TelegrafConfig
+						assert.NotEqual(t, initial.ID, updated.ID)
+						initial.ID, updated.ID = 0, 0
+						assert.Equal(t, initial, updated)
+					})
+				})
+
+				t.Run("should not error when attempting to remove", func(t *testing.T) {
+					testUserDeletedTelegraf(t, func(t *testing.T, stackID influxdb.ID, _ pkger.Object, _ pkger.Summary) {
+						testValidRemoval(t, stackID)
+					})
+				})
+			})
 		})
 	})
 
@@ -3098,6 +3134,12 @@ func (r resourceChecker) mustGetTelegrafConfig(t *testing.T, getOpt getResourceO
 	return tele
 }
 
+func (r resourceChecker) mustDeleteTelegrafConfig(t *testing.T, id influxdb.ID) {
+	t.Helper()
+
+	require.NoError(t, r.tl.TelegrafService(t).DeleteTelegrafConfig(ctx, id))
+}
+
 func (r resourceChecker) getVariable(t *testing.T, getOpt getResourceOptFn) (influxdb.Variable, error) {
 	t.Helper()
 

pkger/service.go

@@ -2340,13 +2340,16 @@ func (s *Service) applyTelegrafs(ctx context.Context, userID influxdb.ID, teles
 }
 
 func (s *Service) applyTelegrafConfig(ctx context.Context, userID influxdb.ID, t *stateTelegraf) (influxdb.TelegrafConfig, error) {
-	switch t.stateStatus {
-	case StateStatusRemove:
+	switch {
+	case IsRemoval(t.stateStatus):
 		if err := s.teleSVC.DeleteTelegrafConfig(ctx, t.ID()); err != nil {
+			if influxdb.ErrorCode(err) == influxdb.ENotFound {
+				return influxdb.TelegrafConfig{}, nil
+			}
 			return influxdb.TelegrafConfig{}, ierrors.Wrap(err, "failed to delete config")
 		}
 		return *t.existing, nil
-	case StateStatusExists:
+	case IsExisting(t.stateStatus) && t.existing != nil:
 		cfg := t.summarize().TelegrafConfig
 		updatedConfig, err := s.teleSVC.UpdateTelegrafConfig(ctx, t.ID(), &cfg, userID)
 		if err != nil {
@@ -2365,6 +2368,10 @@ func (s *Service) applyTelegrafConfig(ctx context.Context, userID influxdb.ID, t
 
 func (s *Service) rollbackTelegrafConfigs(ctx context.Context, userID influxdb.ID, cfgs []*stateTelegraf) error {
 	rollbackFn := func(t *stateTelegraf) error {
+		if !IsNew(t.stateStatus) && t.existing == nil {
+			return nil
+		}
+
 		var err error
 		switch t.stateStatus {
 		case StateStatusRemove: