Chapter 4. Configuring secrets for Alertmanager

Procedure

1. Edit the ConfigMap object.

   • To add a secret configuration to Alertmanager for core platform monitoring:

     1. Edit the cluster-monitoring-config config map in the openshift-monitoring project:

        $ oc -n openshift-monitoring edit configmap cluster-monitoring-config

     2. Add a secrets: section under data/config.yaml/alertmanagerMain with the following configuration:

        apiVersion: v1
        kind: ConfigMap
        metadata:
          name: cluster-monitoring-config
          namespace: openshift-monitoring
        data:
          config.yaml: |
            alertmanagerMain:
              secrets: 1
              - <secret_name_1> 2
              - <secret_name_2>

        1

        This section contains the secrets to be mounted into Alertmanager. The secrets must be located within the same namespace as the Alertmanager object.

        2

        The name of the Secret object that contains authentication credentials for the receiver. If you add multiple secrets, place each one on a new line.

        The following sample config map settings configure Alertmanager to use two Secret objects named test-secret-basic-auth and test-secret-api-token:

        apiVersion: v1
        kind: ConfigMap
        metadata:
          name: cluster-monitoring-config
          namespace: openshift-monitoring
        data:
          config.yaml: |
            alertmanagerMain:
              secrets:
              - test-secret-basic-auth
              - test-secret-api-token

   • To add a secret configuration to Alertmanager for user-defined project monitoring:

     1. Edit the user-workload-monitoring-config config map in the openshift-user-workload-monitoring project:

        $ oc -n openshift-user-workload-monitoring edit configmap user-workload-monitoring-config

     2. Add a secrets: section under data/config.yaml/alertmanager/secrets with the following configuration:

        apiVersion: v1
        kind: ConfigMap
        metadata:
          name: user-workload-monitoring-config
          namespace: openshift-user-workload-monitoring
        data:
          config.yaml: |
            alertmanager:
              secrets: 1
              - <secret_name_1> 2
              - <secret_name_2>

        1

        This section contains the secrets to be mounted into Alertmanager. The secrets must be located within the same namespace as the Alertmanager object.

        2

        The name of the Secret object that contains authentication credentials for the receiver. If you add multiple secrets, place each one on a new line.

        The following sample config map settings configure Alertmanager to use two Secret objects named test-secret and test-secret-api-token:

        apiVersion: v1
        kind: ConfigMap
        metadata:
          name: user-workload-monitoring-config
          namespace: openshift-user-workload-monitoring
        data:
          config.yaml: |
            alertmanager:
              enabled: true
              secrets:
              - test-secret
              - test-api-receiver-token

2. Save the file to apply the changes. The new configuration is applied automatically.

Procedure

1. Edit the ConfigMap object:

   • To attach custom labels to all time series and alerts leaving the Prometheus instance that monitors core OpenShift Container Platform projects:

     1. Edit the cluster-monitoring-config ConfigMap object in the openshift-monitoring project:

        $ oc -n openshift-monitoring edit configmap cluster-monitoring-config

     2. Define a map of labels you want to add for every metric under data/config.yaml:

        apiVersion: v1
        kind: ConfigMap
        metadata:
          name: cluster-monitoring-config
          namespace: openshift-monitoring
        data:
          config.yaml: |
            prometheusK8s:
              externalLabels:
                <key>: <value> 1

        1

        Substitute <key>: <value> with a map of key-value pairs where <key> is a unique name for the new label and <value> is its value.

        Warning
        • Do not use prometheus or prometheus_replica as key names, because they are reserved and will be overwritten.
        • Do not use cluster or managed_cluster as key names. Using them can cause issues where you are unable to see data in the developer dashboards.

        For example, to add metadata about the region and environment to all time series and alerts, use the following example:

        apiVersion: v1
        kind: ConfigMap
        metadata:
          name: cluster-monitoring-config
          namespace: openshift-monitoring
        data:
          config.yaml: |
            prometheusK8s:
              externalLabels:
                region: eu
                environment: prod

     3. Save the file to apply the changes. The new configuration is applied automatically.

   • To attach custom labels to all time series and alerts leaving the Prometheus instance that monitors user-defined projects:

     1. Edit the user-workload-monitoring-config ConfigMap object in the openshift-user-workload-monitoring project:

        $ oc -n openshift-user-workload-monitoring edit configmap user-workload-monitoring-config

     2. Define a map of labels you want to add for every metric under data/config.yaml:

        apiVersion: v1
        kind: ConfigMap
        metadata:
          name: user-workload-monitoring-config
          namespace: openshift-user-workload-monitoring
        data:
          config.yaml: |
            prometheus:
              externalLabels:
                <key>: <value> 1

        1

        Substitute <key>: <value> with a map of key-value pairs where <key> is a unique name for the new label and <value> is its value.

        Warning
        • Do not use prometheus or prometheus_replica as key names, because they are reserved and will be overwritten.
        • Do not use cluster or managed_cluster as key names. Using them can cause issues where you are unable to see data in the developer dashboards.
        Note

        In the openshift-user-workload-monitoring project, Prometheus handles metrics and Thanos Ruler handles alerting and recording rules. Setting externalLabels for prometheus in the user-workload-monitoring-config ConfigMap object will only configure external labels for metrics and not for any rules.

        For example, to add metadata about the region and environment to all time series and alerts related to user-defined projects, use the following example:

        apiVersion: v1
        kind: ConfigMap
        metadata:
          name: user-workload-monitoring-config
          namespace: openshift-user-workload-monitoring
        data:
          config.yaml: |
            prometheus:
              externalLabels:
                region: eu
                environment: prod

     3. Save the file to apply the changes. The pods affected by the new configuration are automatically redeployed.