Notifications¶

Important

Available since v1.1

Argo Rollouts provides notifications powered by the Notifications Engine. Controller administrators can leverage flexible systems of triggers and templates to configure notifications requested by the end users. The end-users can subscribe to the configured triggers by adding an annotation to the Rollout objects.

Configuration¶

The trigger defines the condition when the notification should be sent as well as the notification content template. Default Argo Rollouts comes with a list of built-in triggers that cover the most important events of Argo Rollout live-cycle. Both triggers and templates are configured in the argo-rollouts-notification-configmap ConfigMap. In order to get started quickly, you can use pre-configured notification templates defined in notifications-install.yaml.

If you are leveraging Kustomize it is recommended to include notifications-install.yaml as a remote resource into your kustomization.yaml file:

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

resources:
- https://github.com/argoproj/argo-rollouts/releases/latest/download/install.yaml
- https://github.com/argoproj/argo-rollouts/releases/latest/download/notifications-install.yaml

After including the argo-rollouts-notification-configmap ConfigMap the administrator needs to configure integration with the required notifications service such as Slack or MS Teams. An example below demonstrates Slack integration:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argo-rollouts-notification-configmap
data:
  # detail of the templates is omitted
  # detail of the triggers is omitted
  service.slack: |
    token: $slack-token
---
apiVersion: v1
kind: Secret
metadata:
  name: argo-rollouts-notification-secret
stringData:
  slack-token: <my-slack-token>

Learn more about supported services and configuration settings in services documentation.

Namespace based configuration¶

Important

Available since v1.6

A common installation method for Argo Rollouts is to install it in a dedicated namespace to manage a whole cluster. In this case, the administrator is the only person who can configure notifications in that namespace generally. However, in some cases, it is required to allow end-users to configure notifications for their Rollout resources. For example, the end-user can configure notifications for their Rollouts in the namespace where they have access to and their rollout is running in.

To use this feature all you need to do is create the same configmap named argo-rollouts-notification-configmap and possibly a secret argo-rollouts-notification-secret in the namespace where the rollout object lives. When it is configured this way the controller will send notifications using both the controller level configuration (the configmap located in the same namespaces as the controller) as well as the configmap located in the same namespaces where the rollout object is at.

To enable you need to add a flag to the controller --self-service-notification-enabled

Default Trigger templates¶

Currently the following triggers have built-in templates.

on-rollout-completed when a rollout is finished and all its steps are completed
on-rollout-step-completed when an individual step inside a rollout definition is completed
on-rollout-updated when a rollout definition is changed
on-scaling-replica-set when the number of replicas in a rollout is changed

Subscriptions¶

The end-users can start leveraging notifications using notifications.argoproj.io/subscribe.<trigger>.<service>: <recipient> annotation. For example, the following annotation subscribes two Slack channels to notifications about canary rollout step completion:

---
apiVersion: argoproj.io/v1alpha1
kind: Rollout
metadata:
  name: rollout-canary
  annotations:
    notifications.argoproj.io/subscribe.on-rollout-step-completed.slack: my-channel1;my-channel2

Annotation key consists of following parts:

on-rollout-step-completed - trigger name
slack - notification service name
my-channel1;my-channel2 - a semicolon separated list of recipients

Customization¶

The Rollout administrator can customize the notifications by configuring notification templates and custom triggers in argo-rollouts-notification-configmap ConfigMap.

Templates¶

The notification template is a stateless function that generates the notification content. The template is leveraging html/template golang package. It is meant to be reusable and can be referenced by multiple triggers.

An example below demonstrates a sample template:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argo-rollouts-notification-configmap
data:
  template.my-purple-template: |
    message: |
      Rollout {{.rollout.metadata.name}} has purple image
    slack:
        attachments: |
            [{
              "title": "{{ .rollout.metadata.name}}",
              "color": "#800080"
            }]

Each template has access to the following fields:

rollout holds the rollout object.
recipient holds the recipient name.

The message field of the template definition allows creating a basic notification for any notification service. You can leverage notification service-specific fields to create complex notifications. For example using service-specific you can add blocks and attachments for Slack, subject for Email or URL path, and body for Webhook. See corresponding service documentation for more information.

Custom Triggers¶

In addition to custom notification template administrator and configure custom triggers. Custom trigger defines the condition when the notification should be sent. The definition includes name, condition and notification templates reference. The condition is a predicate expression that returns true if the notification should be sent. The trigger condition evaluation is powered by antonmedv/expr. The condition language syntax is described at Language-Definition.md.

The trigger is configured in argo-rollouts-notification-configmap ConfigMap. For example the following trigger sends a notification when rollout pod spec uses argoproj/rollouts-demo:purple image:

apiVersion: v1
kind: ConfigMap
metadata:
  name: argo-rollouts-notification-configmap
data:
  trigger.on-purple: |
    - send: [my-purple-template]
      when: rollout.spec.template.spec.containers[0].image == 'argoproj/rollouts-demo:purple'

Each condition might use several templates. Typically each template is responsible for generating a service-specific notification part.

Notification Metrics¶

The following prometheus metrics are emitted when notifications are enabled in argo-rollouts. - notification_send_success is a counter that measures how many times the notification is sent successfully. - notification_send_error is a counter that measures how many times the notification failed to send. - notification_send is a histogram that measures performance of sending notification.