:_mod-docs-content-type: PROCEDURE
[id="adopting-telemetry-services_{context}"]

= Adopting Telemetry services

[role="_abstract"]
To adopt Telemetry services, you patch an existing `OpenStackControlPlane` custom resource (CR) that has Telemetry services disabled to start the service with the configuration parameters that are provided by the {rhos_prev_long} ({OpenStackShort}) {rhos_prev_ver} environment.

If you adopt Telemetry services, the observability solution that is used in the {OpenStackShort} {rhos_prev_ver} environment, Service Telemetry Framework, is removed from the cluster. The new solution is deployed in the {rhos_long} environment, allowing for metrics, and optionally logs, to be retrieved and stored in the new back ends.

You cannot automatically migrate old data because different back ends are used. Metrics and logs are considered short-lived data and are not intended to be migrated to the {rhos_acro} environment. For information about adopting legacy autoscaling stack templates to the {rhos_acro} environment, see xref:adopting-autoscaling_adopt-control-plane[Adopting Autoscaling services].

.Prerequisites

* The {OpenStackPreviousInstaller} environment is running (the source cloud).
* The Single Node OpenShift or OpenShift Local is running in the {rhocp_long} cluster.
* Previous adoption steps are completed.

.Procedure

. Patch the `OpenStackControlPlane` CR to deploy `cluster-observability-operator`:
+
----
$ oc create -f - <<EOF
apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: cluster-observability-operator
  namespace: openshift-operators
spec:
  channel: stable
  installPlanApproval: Automatic
  name: cluster-observability-operator
  source: redhat-operators
  sourceNamespace: openshift-marketplace
EOF
----

. Wait for the installation to succeed:
+
----
$ oc wait --for jsonpath="{.status.phase}"=Succeeded csv --namespace=openshift-operators -l operators.coreos.com/cluster-observability-operator.openshift-operators
----

. Patch the `OpenStackControlPlane` CR to deploy Ceilometer services:
+
----
$ oc patch openstackcontrolplane openstack --type=merge --patch '
spec:
  telemetry:
    enabled: true
    template:
      ceilometer:
        passwordSelector:
          ceilometerService: CeilometerPassword
        enabled: true
        secret: osp-secret
        serviceUser: ceilometer
'
----

. Enable the metrics storage back end:
+
----
$ oc patch openstackcontrolplane openstack --type=merge --patch '
spec:
  telemetry:
    template:
      metricStorage:
        enabled: true
        monitoringStack:
          alertingEnabled: true
          scrapeInterval: 30s
          storage:
            strategy: persistent
            retention: 24h
            persistent:
              pvcStorageRequest: 20G
'
----

.Verification

. Verify that the `alertmanager` and `prometheus` pods are available:
+
----
$ oc get pods -l alertmanager=metric-storage
NAME                            READY   STATUS    RESTARTS   AGE
alertmanager-metric-storage-0   2/2     Running   0          46s
alertmanager-metric-storage-1   2/2     Running   0          46s

$ oc get pods -l prometheus=metric-storage
NAME                          READY   STATUS    RESTARTS   AGE
prometheus-metric-storage-0   3/3     Running   0          46s
----

. Inspect the resulting Ceilometer pods:
+
----
CEILOMETETR_POD=`oc get pods -l service=ceilometer | tail -n 1 | cut -f 1 -d' '`
oc exec -t $CEILOMETETR_POD -c ceilometer-central-agent -- cat /etc/ceilometer/ceilometer.conf
----

. Inspect enabled pollsters:
+
----
$ oc get secret ceilometer-config-data -o jsonpath="{.data['polling\.yaml\.j2']}"  | base64 -d
----

. Optional: Override default pollsters according to the requirements of your environment:
+
----
$ oc patch openstackcontrolplane controlplane --type=merge --patch '
spec:
  telemetry:
    template:
      ceilometer:
          defaultConfigOverwrite:
            polling.yaml.j2: |
              ---
              sources:
                - name: pollsters
                  interval: 100
                  meters:
                    - volume.*
                    - image.size
          enabled: true
          secret: osp-secret
'
----

.Next steps

. Optional: Patch the `OpenStackControlPlane` CR to include `logging`:
+
----
$ oc patch openstackcontrolplane openstack --type=merge --patch '
spec:
  telemetry:
    template:
      logging:
      enabled: false
      ipaddr: 172.17.0.80
      port: 10514
      cloNamespace: openshift-logging
'
----