Transformation

The transform can be used to convert one canary check into multiple checks programmatically.

apiVersion: canaries.flanksource.com/v1
kind: Canary
metadata:
  name: alertmanager-check
spec:
  schedule: "*/5 * * * *"
  alertmanager:
    - url: alertmanager.example.com
      name: alert-manager-transform
      alerts:
        - .*
      ignore:
        - KubeScheduler.*
      transform:
        expr: |
          results.alerts.map(r, {
              'name': r.name,
              'labels': r.labels,
              'icon': 'alert',
              'message': r.message,
              'description': r.message,
          }).toJSON()

In the above example, the check will return multiple alerts from alertmanager. By default, all of those alerts will be grouped in a single check.

But if we want to display each alert as its own check in the UI, we can use the transform function for this. The transform function takes a Template as input and the output from the template expected are the checks in JSON format.

For example, if there are 9 different alerts, each alert will have its own check that can be managed and interacted with equally.