[release-12.0.2] Alerting: Provisioning API returns 403 on quota exceeded for rule group PUT (#106477)

Alerting: Provisioning API returns 403 on quota exceeded for rule group PUT (#106409)

(cherry picked from commit 1df888c517)

Co-authored-by: Vadim Stepanov <vstpme@gmail.com>

pkg/services/ngalert/api/api_provisioning.go

@@ -515,6 +515,9 @@ func (srv *ProvisioningSrv) RoutePutAlertRuleGroup(c *contextmodel.ReqContext, a
 	if errors.Is(err, store.ErrOptimisticLock) {
 		return ErrResp(http.StatusConflict, err, "")
 	}
+	if errors.Is(err, alerting_models.ErrQuotaReached) {
+		return ErrResp(http.StatusForbidden, err, "")
+	}
 	if err != nil {
 		return response.ErrOrFallback(http.StatusInternalServerError, "", err)
 	}

pkg/services/ngalert/api/api_provisioning_test.go

@@ -695,6 +695,20 @@ func TestProvisioningApi(t *testing.T) {
 			})
 		})
 
+		t.Run("have reached the rule quota, PUT returns 403", func(t *testing.T) {
+			env := createTestEnv(t, testConfig)
+			quotas := provisioning.MockQuotaChecker{}
+			quotas.EXPECT().LimitExceeded()
+			env.quotas = &quotas
+			sut := createProvisioningSrvSutFromEnv(t, &env)
+			group := createTestAlertRuleGroup(1)
+			rc := createTestRequestCtx()
+
+			response := sut.RoutePutAlertRuleGroup(&rc, group, "folder-uid", group.Title)
+
+			require.Equal(t, 403, response.Status())
+		})
+
 		t.Run("are valid", func(t *testing.T) {
 			t.Run("PUT returns 200", func(t *testing.T) {
 				sut := createProvisioningSrvSut(t)