[Feature] Add basic metrics for ArangoDeploymentReplication CR (GT-242)

CHANGELOG.md

@@ -15,6 +15,7 @@
 - (Bugfix) Fix GZIP encoding in case of small responses
 - (Bugfix) Fix PVC Rotation Discovery
 - (Feature) Allow to pass EphemeralStorage Resource to the Pods
+- (Feature) Add basic metrics for ArangoDeploymentReplication CR
 
 ## [1.2.32](https://github.com/arangodb/kube-arangodb/tree/1.2.32) (2023-08-07)
 - (Feature) Backup lifetime - remove Backup once its lifetime has been reached

docs/generated/metrics/README.md

@@ -32,5 +32,7 @@
 |   [arangodb_operator_resources_arangodeployment_status_restores](./arangodb_operator_resources_arangodeployment_status_restores.md)   | arangodb_operator |     resources     | Counter | Counter for deployment status restored                                                |
 |          [arangodb_operator_resources_arangodeployment_uptodate](./arangodb_operator_resources_arangodeployment_uptodate.md)          | arangodb_operator |     resources     |  Gauge  | Defines if ArangoDeployment is uptodate                                               |
 | [arangodb_operator_resources_arangodeployment_validation_errors](./arangodb_operator_resources_arangodeployment_validation_errors.md) | arangodb_operator |     resources     | Counter | Counter for deployment validation errors                                              |
+| [arangodb_operator_resources_arangodeploymentreplication_active](./arangodb_operator_resources_arangodeploymentreplication_active.md) | arangodb_operator |     resources     |  Gauge  | Defines if ArangoDeploymentReplication is configured and running                      |
+| [arangodb_operator_resources_arangodeploymentreplication_failed](./arangodb_operator_resources_arangodeploymentreplication_failed.md) | arangodb_operator |     resources     |  Gauge  | Defines if ArangoDeploymentReplication is in Failed phase                             |
 
 <!-- END(metricsTable) -->

docs/generated/metrics/arangodb_operator_resources_arangodeploymentreplication_active.md

@@ -0,0 +1,12 @@
+# arangodb_operator_resources_arangodeploymentreplication_active (Gauge)
+
+## Description
+
+Defines if ArangoDeploymentReplication is configured and running
+
+## Labels
+
+|   Label   | Description                     |
+|:---------:|:--------------------------------|
+| namespace | DeploymentReplication Namespace |
+|   name    | DeploymentReplication Name      |

docs/generated/metrics/arangodb_operator_resources_arangodeploymentreplication_failed.md

@@ -0,0 +1,12 @@
+# arangodb_operator_resources_arangodeploymentreplication_failed (Gauge)
+
+## Description
+
+Defines if ArangoDeploymentReplication is in Failed phase
+
+## Labels
+
+|   Label   | Description                     |
+|:---------:|:--------------------------------|
+| namespace | DeploymentReplication Namespace |
+|   name    | DeploymentReplication Name      |

internal/metrics.yaml

@@ -201,6 +201,24 @@ namespaces:
             description: "Deployment Namespace"
           - key: name
             description: "Deployment Name"
+      arangodeploymentreplication_active:
+        shortDescription: "Defines if ArangoDeploymentReplication is configured and running"
+        description: "Defines if ArangoDeploymentReplication is configured and running"
+        type: "Gauge"
+        labels:
+          - key: namespace
+            description: "DeploymentReplication Namespace"
+          - key: name
+            description: "DeploymentReplication Name"
+      arangodeploymentreplication_failed:
+        shortDescription: "Defines if ArangoDeploymentReplication is in Failed phase"
+        description: "Defines if ArangoDeploymentReplication is in Failed phase"
+        type: "Gauge"
+        labels:
+          - key: namespace
+            description: "DeploymentReplication Namespace"
+          - key: name
+            description: "DeploymentReplication Name"
     members:
       unexpected_container_exit_codes:
         shortDescription: "Counter of unexpected restarts in pod (Containers/InitContainers/EphemeralContainers)"

pkg/replication/deployment_replication.go

@@ -85,6 +85,7 @@ type DeploymentReplication struct {
 	status    api.DeploymentReplicationStatus  // Internal status of the CR
 	config    Config
 	deps      Dependencies
+	metrics   Metrics
 
 	eventCh chan *deploymentReplicationEvent
 	stopCh  chan struct{}
@@ -111,6 +112,8 @@ func New(config Config, deps Dependencies, apiObject *api.ArangoDeploymentReplic
 
 	dr.log = logger.WrapObj(dr)
 
+	localInventory.Add(dr)
+
 	go dr.run()
 
 	return dr, nil
@@ -126,7 +129,7 @@ func (dr *DeploymentReplication) Update(apiObject *api.ArangoDeploymentReplicati
 }
 
 // Delete the deployment replication.
-// Called when the local storage was deleted by the user.
+// Called when the CR was deleted by the user.
 func (dr *DeploymentReplication) Delete() {
 	dr.log.Info("deployment replication is deleted by user")
 	if atomic.CompareAndSwapInt32(&dr.stopped, 0, 1) {

pkg/replication/inventory.go

@@ -0,0 +1,61 @@
+//
+// DISCLAIMER
+//
+// Copyright 2023 ArangoDB GmbH, Cologne, Germany
+//
+// 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.
+//
+// Copyright holder is ArangoDB GmbH, Cologne, Germany
+//
+
+package replication
+
+import (
+	"sync"
+
+	"github.com/arangodb/kube-arangodb/pkg/metrics/collector"
+	"github.com/arangodb/kube-arangodb/pkg/util/metrics"
+)
+
+func init() {
+	localInventory = inventory{
+		deploymentReplications: map[string]map[string]*DeploymentReplication{},
+	}
+	collector.GetCollector().RegisterMetric(&localInventory)
+}
+
+var localInventory inventory
+
+type inventory struct {
+	lock                   sync.Mutex
+	deploymentReplications map[string]map[string]*DeploymentReplication
+}
+
+func (i *inventory) CollectMetrics(in metrics.PushMetric) {
+	for _, drs := range i.deploymentReplications {
+		for _, dr := range drs {
+			dr.CollectMetrics(in)
+		}
+	}
+}
+
+func (i *inventory) Add(dr *DeploymentReplication) {
+	i.lock.Lock()
+	defer i.lock.Unlock()
+
+	name, namespace := dr.apiObject.GetName(), dr.apiObject.GetNamespace()
+	if _, ok := i.deploymentReplications[namespace]; !ok {
+		i.deploymentReplications[namespace] = map[string]*DeploymentReplication{}
+	}
+	i.deploymentReplications[namespace][name] = dr
+}

pkg/replication/metrics.go

@@ -0,0 +1,44 @@
+//
+// DISCLAIMER
+//
+// Copyright 2023 ArangoDB GmbH, Cologne, Germany
+//
+// 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.
+//
+// Copyright holder is ArangoDB GmbH, Cologne, Germany
+//
+
+package replication
+
+import (
+	"github.com/arangodb/kube-arangodb/pkg/generated/metric_descriptions"
+	"github.com/arangodb/kube-arangodb/pkg/util"
+	"github.com/arangodb/kube-arangodb/pkg/util/metrics"
+)
+
+type Metrics struct {
+	DeploymentReplication struct {
+		Active, Failed bool
+	}
+}
+
+func (dr *DeploymentReplication) CollectMetrics(m metrics.PushMetric) {
+	name, namespace := dr.apiObject.GetName(), dr.apiObject.GetNamespace()
+
+	m.Push(metric_descriptions.ArangodbOperatorResourcesArangodeploymentreplicationActiveGauge(
+		util.BoolSwitch[float64](dr.metrics.DeploymentReplication.Active, 1, 0), namespace, name),
+	)
+	m.Push(metric_descriptions.ArangodbOperatorResourcesArangodeploymentreplicationFailedGauge(
+		util.BoolSwitch[float64](dr.metrics.DeploymentReplication.Failed, 1, 0), namespace, name),
+	)
+}

pkg/replication/sync_inspector.go

@@ -50,8 +50,12 @@ func (dr *DeploymentReplication) inspectDeploymentReplication(lastInterval time.
 		dr.log.Err(err).Warn("Failed to add finalizers")
 	}
 
+	isFailed := dr.status.Phase.IsFailed()
+	dr.metrics.DeploymentReplication.Failed = isFailed
+	dr.metrics.DeploymentReplication.Active = dr.status.Conditions.IsTrue(api.ConditionTypeConfigured)
+
 	// Is the deployment in failed state, if so, give up.
-	if dr.status.Phase.IsFailed() {
+	if isFailed {
 		dr.log.Debug("Deployment replication is in Failed state.")
 		return nextInterval
 	}