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Crier

Crier reports the Prow Job status changes. For now, it is responsible for Slack notifications as Plank is still reporting the Prow Job statuses to GitHub.

Available Reporters

Crier supports multiple reporters. Each reporter will become a Crier controller. Reporters that can be used:

  • GitHub reporter
  • Slack reporter
  • PubSub reporter

For any reporter that you want to use, you must mount your Prow configs and specify the --config-path and --job-config-path flags.

GitHub Reporter

You can enable the GitHub reporter in Crier by specifying the --github-workers=N flag.

You must also mount a GitHub OAuth token by specifying the --github-token-path flag, which defaults to /etc/github/oauth.

If you have a ghproxy deployed, also remember to point --github-endpoint to your ghproxy to avoid token throttle.

Slack Reporter

NOTE: When you enable Crier for the first time, it will sent to Slack all Prow Jobs matching the configured filtering criteria.

You can enable the Slack reporter in Crier by specifying the --slack-workers and --slack-token-file flags.

The --slack-token-file flag takes the path to the file containing the Slack OAuth Access Token.

The OAuth Access Token can be obtained as follows:

  1. Navigate to https://api.slack.com/apps.
  2. Click Create New App.
  3. Provide the App Name (e.g. Prow Slack Reporter) and Development Slack Workspace (e.g. Kubernetes).
  4. Click Permissions.
  5. Add the chat:write.public scope using the Scopes / Bot Token Scopes dropdown and click Save Changes.
  6. Click Install App to Workspace.
  7. Click Allow to authorize the OAuth scopes.
  8. Copy the OAuth Access Token.

Once the access token is obtained, you can create a Secret in the cluster using that value:

kubectl create secret generic slack-token --from-literal=token="{ACCESS_TOKEN}"

Furthermore, to make this token available to Crier, mount the slack-token Secret as a volume and set the --slack-token-file flag in the deployment spec:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: crier
  labels:
    app: crier
spec:
  selector:
    matchLabels:
      app: crier
  template:
    metadata:
      labels:
        app: crier
    spec:
      containers:
      - name: crier
        image: gcr.io/k8s-prow/crier:v20200205-656133e91
        args:
        - --slack-workers=1
        - --slack-token-file=/etc/slack/token
        - --config-path=/etc/config/config.yaml
        - --dry-run=false
        volumeMounts:
        - mountPath: /etc/config
          name: config
          readOnly: true
        - name: slack
          mountPath: /etc/slack
          readOnly: true
      volumes:
      - name: slack
        secret:
          secretName: slack-token
      - name: config
        configMap:
          name: config

Additionally, in order for it to work with Prow you must add the following to your config.yaml:

NOTE: slack_reporter_configs is a map of the org, org/repo, or * wildcard to a set of Slack reporter configs.

slack_reporter_configs:

  # Wildcard (i.e. catch-all) slack config
  "*":
    # default: None
    job_types_to_report:
      - presubmit
      - postsubmit
    # default: None
    job_states_to_report:
      - failure
      - error
    # required
    channel: my-slack-channel
    # The template shown below is the default
    report_template: "Job {{.Spec.Job}} of type {{.Spec.Type}} ended with state {{.Status.State}}. <{{.Status.URL}}|View logs>"

  # "org/repo" slack config
  istio/proxy:
    job_types_to_report:
      - presubmit
    job_states_to_report:
      - error
    channel: istio-proxy-channel

  # "org" slack config
  istio:
    job_types_to_report:
      - periodic
    job_states_to_report:
      - failure
    channel: istio-channel

The Slack channel can be overridden at the Prow Job level via the reporter_config.slack.channel field:

postsubmits:
  some-org/some-repo:
    - name: example-job
      decorate: true
      reporter_config:
        slack:
          channel: 'override-channel-name'
      spec:
        containers:
          - image: alpine
            command:
              - echo

Current Slack Notification Settings

Crier does not send any Slack notifications for presubmit jobs.

Reporter config:

job_types_to_report:
  - postsubmit
  - periodic
  - batch

If you don't want to configure postsubmit or periodic jobs to report to a Slack channel, use skip_report:true. If the job is still in the testing phase, you can set optional: true.

Migration from Plank to GitHub Reporter

First, you need to disable GitHub reporting in Plank. To do that, add the --skip-report=true flag to the Plank deployment.

Before migrating, upgrade your Plank to a version that includes the commit 2118178.

Flags required by Crier:

  • Point --config-path and --job-config-path to your Prow config and job configs accordingly.
  • Set --github-worker to be the number of parallel GitHub reporting threads you need.
  • Point --github-endpoint to ghproxy, if you have set that for Plank.
  • Bind GitHub OAuth token as a Secret and set --github-token-path if you have that set for Plank.

In your Plank deployment, you must:

  • Remove the --github-endpoint flag.
  • Remove the GitHub OAuth Secret and the --github-token-path flag if set.
  • Add --skip-report, so Plank will skip the reporting logic.

Both changes should be deployed at the same time. If you need to deploy them sequentially, deploy Crier first to avoid double-reporting.