feat: add resource MonitoringServiceLevelObjective

apis/monitoring/v1alpha1/doc.go

@@ -0,0 +1,16 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +kcc:proto=google.monitoring.v3
+package v1alpha1

apis/monitoring/v1alpha1/groupversion_info.go

@@ -0,0 +1,33 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +kubebuilder:object:generate=true
+// +groupName=monitoring.cnrm.cloud.google.com
+package v1alpha1
+
+import (
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"sigs.k8s.io/controller-runtime/pkg/scheme"
+)
+
+var (
+	// GroupVersion is group version used to register these objects
+	GroupVersion = schema.GroupVersion{Group: "monitoring.cnrm.cloud.google.com", Version: "v1alpha1"}
+
+	// SchemeBuilder is used to add go types to the GroupVersionKind scheme
+	SchemeBuilder = &scheme.Builder{GroupVersion: GroupVersion}
+
+	// AddToScheme adds the types in this group-version to the given scheme.
+	AddToScheme = SchemeBuilder.AddToScheme
+)

apis/monitoring/v1alpha1/servicelevelobjective_identity.go

@@ -0,0 +1,118 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package v1alpha1
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/GoogleCloudPlatform/k8s-config-connector/apis/common"
+	refsv1beta1 "github.com/GoogleCloudPlatform/k8s-config-connector/apis/refs/v1beta1"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+// ServiceLevelObjectiveIdentity defines the resource reference to MonitoringServiceLevelObjective, which "External" field
+// holds the GCP identifier for the KRM object.
+type ServiceLevelObjectiveIdentity struct {
+	parent *ServiceLevelObjectiveParent
+	id string
+}
+
+func (i *ServiceLevelObjectiveIdentity) String() string {
+	return  i.parent.String() + "/servicelevelobjectives/" + i.id
+}
+
+func (i *ServiceLevelObjectiveIdentity) ID() string {
+	return i.id
+}
+
+func (i *ServiceLevelObjectiveIdentity) Parent() *ServiceLevelObjectiveParent {
+	return  i.parent
+}
+
+type ServiceLevelObjectiveParent struct {
+	ProjectID string
+	Location  string
+}
+
+func (p *ServiceLevelObjectiveParent) String() string {
+	return "projects/" + p.ProjectID + "/locations/" + p.Location
+}
+
+
+// New builds a ServiceLevelObjectiveIdentity from the Config Connector ServiceLevelObjective object.
+func NewServiceLevelObjectiveIdentity(ctx context.Context, reader client.Reader, obj *MonitoringServiceLevelObjective) (*ServiceLevelObjectiveIdentity, error) {
+
+	// Get Parent
+	projectRef, err := refsv1beta1.ResolveProject(ctx, reader, obj.GetNamespace(), obj.Spec.ProjectRef)
+	if err != nil {
+		return nil, err
+	}
+	projectID := projectRef.ProjectID
+	if projectID == "" {
+		return nil, fmt.Errorf("cannot resolve project")
+	}
+	location := obj.Spec.Location
+
+	// Get desired ID
+	resourceID := common.ValueOf(obj.Spec.ResourceID)
+	if resourceID == "" {
+		resourceID = obj.GetName()
+	}
+	if resourceID == "" {
+		return nil, fmt.Errorf("cannot resolve resource ID")
+	}
+
+	// Use approved External
+	externalRef := common.ValueOf(obj.Status.ExternalRef)
+	if externalRef != "" {
+		// Validate desired with actual
+		actualParent, actualResourceID, err := ParseServiceLevelObjectiveExternal(externalRef)
+		if err != nil {
+			return nil, err
+		}
+		if actualParent.ProjectID != projectID {
+			return nil, fmt.Errorf("spec.projectRef changed, expect %s, got %s", actualParent.ProjectID, projectID)
+		}
+		if actualParent.Location != location {
+			return nil, fmt.Errorf("spec.location changed, expect %s, got %s", actualParent.Location, location)
+		}
+		if actualResourceID != resourceID {
+			return nil, fmt.Errorf("cannot reset `metadata.name` or `spec.resourceID` to %s, since it has already assigned to %s",
+				resourceID, actualResourceID)
+		}
+	}
+	return &ServiceLevelObjectiveIdentity{
+		parent: &ServiceLevelObjectiveParent{
+			ProjectID: projectID,
+			Location:  location,
+		},
+		id: resourceID,
+	}, nil
+}
+
+func ParseServiceLevelObjectiveExternal(external string) (parent *ServiceLevelObjectiveParent, resourceID string, err error) {
+	tokens := strings.Split(external, "/")
+	if len(tokens) != 6 || tokens[0] != "projects" || tokens[2] != "locations" || tokens[4] != "servicelevelobjectives" {
+		return nil, "", fmt.Errorf("format of MonitoringServiceLevelObjective external=%q was not known (use projects/{{projectID}}/locations/{{location}}/servicelevelobjectives/{{servicelevelobjectiveID}})", external)
+	}
+	parent = &ServiceLevelObjectiveParent{
+		ProjectID: tokens[1],
+		Location:  tokens[3],
+	}
+	resourceID = tokens[5]
+	return parent, resourceID, nil
+}

apis/monitoring/v1alpha1/servicelevelobjective_reference.go

@@ -0,0 +1,83 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package v1alpha1
+
+import (
+	"context"
+	"fmt"
+
+	refsv1beta1 "github.com/GoogleCloudPlatform/k8s-config-connector/apis/refs/v1beta1"
+	"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/k8s"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+var _ refsv1beta1.ExternalNormalizer = &ServiceLevelObjectiveRef{}
+
+// ServiceLevelObjectiveRef defines the resource reference to MonitoringServiceLevelObjective, which "External" field
+// holds the GCP identifier for the KRM object.
+type ServiceLevelObjectiveRef struct {
+	// A reference to an externally managed MonitoringServiceLevelObjective resource.
+	// Should be in the format "projects/{{projectID}}/locations/{{location}}/servicelevelobjectives/{{servicelevelobjectiveID}}".
+	External string `json:"external,omitempty"`
+
+	// The name of a MonitoringServiceLevelObjective resource.
+	Name string `json:"name,omitempty"`
+
+	// The namespace of a MonitoringServiceLevelObjective resource.
+	Namespace string `json:"namespace,omitempty"`
+}
+
+// NormalizedExternal provision the "External" value for other resource that depends on MonitoringServiceLevelObjective.
+// If the "External" is given in the other resource's spec.MonitoringServiceLevelObjectiveRef, the given value will be used.
+// Otherwise, the "Name" and "Namespace" will be used to query the actual MonitoringServiceLevelObjective object from the cluster.
+func (r *ServiceLevelObjectiveRef) NormalizedExternal(ctx context.Context, reader client.Reader, otherNamespace string) (string, error) {
+	if r.External != "" && r.Name != "" {
+		return "", fmt.Errorf("cannot specify both name and external on %s reference", MonitoringServiceLevelObjectiveGVK.Kind)
+	}
+	// From given External
+	if r.External != "" {
+		if _, _, err := ParseServiceLevelObjectiveExternal(r.External); err != nil {
+			return "", err
+		}
+		return r.External, nil
+	}
+
+	// From the Config Connector object
+	if r.Namespace == "" {
+		r.Namespace = otherNamespace
+	}
+	key := types.NamespacedName{Name: r.Name, Namespace: r.Namespace}
+	u := &unstructured.Unstructured{}
+	u.SetGroupVersionKind(MonitoringServiceLevelObjectiveGVK)
+	if err := reader.Get(ctx, key, u); err != nil {
+		if apierrors.IsNotFound(err) {
+			return "", k8s.NewReferenceNotFoundError(u.GroupVersionKind(), key)
+		}
+		return "", fmt.Errorf("reading referenced %s %s: %w", MonitoringServiceLevelObjectiveGVK, key, err)
+	}
+	// Get external from status.externalRef. This is the most trustworthy place.
+	actualExternalRef, _, err := unstructured.NestedString(u.Object, "status", "externalRef")
+	if err != nil {
+		return "", fmt.Errorf("reading status.externalRef: %w", err)
+	}
+	if actualExternalRef == "" {
+		return "", k8s.NewReferenceNotReadyError(u.GroupVersionKind(), key)
+	}
+	r.External = actualExternalRef
+	return r.External, nil
+}

apis/monitoring/v1alpha1/servicelevelobjective_types.go

@@ -0,0 +1,84 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package v1alpha1
+
+import (
+	"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/apis/k8s/v1alpha1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+var MonitoringServiceLevelObjectiveGVK = GroupVersion.WithKind("MonitoringServiceLevelObjective")
+
+// MonitoringServiceLevelObjectiveSpec defines the desired state of MonitoringServiceLevelObjective
+// +kcc:proto=google.monitoring.v3.ServiceLevelObjective
+type MonitoringServiceLevelObjectiveSpec struct {
+	// The MonitoringServiceLevelObjective name. If not given, the metadata.name will be used.
+	ResourceID *string `json:"resourceID,omitempty"`
+}
+
+// MonitoringServiceLevelObjectiveStatus defines the config connector machine state of MonitoringServiceLevelObjective
+type MonitoringServiceLevelObjectiveStatus struct {
+	/* Conditions represent the latest available observations of the
+	   object's current state. */
+	Conditions []v1alpha1.Condition `json:"conditions,omitempty"`
+
+	// ObservedGeneration is the generation of the resource that was most recently observed by the Config Connector controller. If this is equal to metadata.generation, then that means that the current reported status reflects the most recent desired state of the resource.
+	ObservedGeneration *int64 `json:"observedGeneration,omitempty"`
+
+	// A unique specifier for the MonitoringServiceLevelObjective resource in GCP.
+	ExternalRef *string `json:"externalRef,omitempty"`
+
+	// ObservedState is the state of the resource as most recently observed in GCP.
+	ObservedState *MonitoringServiceLevelObjectiveObservedState `json:"observedState,omitempty"`
+}
+
+// MonitoringServiceLevelObjectiveObservedState is the state of the MonitoringServiceLevelObjective resource as most recently observed in GCP.
+// +kcc:proto=google.monitoring.v3.ServiceLevelObjective
+type MonitoringServiceLevelObjectiveObservedState struct {
+}
+
+// +genclient
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+// TODO(user): make sure the pluralizaiton below is correct
+// +kubebuilder:resource:categories=gcp,shortName=gcpmonitoringservicelevelobjective;gcpmonitoringservicelevelobjectives
+// +kubebuilder:subresource:status
+// +kubebuilder:metadata:labels="cnrm.cloud.google.com/managed-by-kcc=true";"cnrm.cloud.google.com/system=true"
+// +kubebuilder:printcolumn:name="Age",JSONPath=".metadata.creationTimestamp",type="date"
+// +kubebuilder:printcolumn:name="Ready",JSONPath=".status.conditions[?(@.type=='Ready')].status",type="string",description="When 'True', the most recent reconcile of the resource succeeded"
+// +kubebuilder:printcolumn:name="Status",JSONPath=".status.conditions[?(@.type=='Ready')].reason",type="string",description="The reason for the value in 'Ready'"
+// +kubebuilder:printcolumn:name="Status Age",JSONPath=".status.conditions[?(@.type=='Ready')].lastTransitionTime",type="date",description="The last transition time for the value in 'Status'"
+
+// MonitoringServiceLevelObjective is the Schema for the MonitoringServiceLevelObjective API
+// +k8s:openapi-gen=true
+type MonitoringServiceLevelObjective struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	// +required
+	Spec   MonitoringServiceLevelObjectiveSpec   `json:"spec,omitempty"`
+	Status MonitoringServiceLevelObjectiveStatus `json:"status,omitempty"`
+}
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+// MonitoringServiceLevelObjectiveList contains a list of MonitoringServiceLevelObjective
+type MonitoringServiceLevelObjectiveList struct {
+	metav1.TypeMeta `json:",inline"`
+	metav1.ListMeta `json:"metadata,omitempty"`
+	Items           []MonitoringServiceLevelObjective `json:"items"`
+}
+
+func init() {
+	SchemeBuilder.Register(&MonitoringServiceLevelObjective{}, &MonitoringServiceLevelObjectiveList{})
+}