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Sep 24, 2025
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Add High availability documentation section for eventing #6401

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33 changes: 33 additions & 0 deletions docs/versioned/install/operator/configuring-eventing-cr.md
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Expand Up @@ -301,6 +301,39 @@ spec:
defaultBrokerClass: MTChannelBasedBroker
```

## High availability

By default, Knative Eventing runs a single instance of each deployment. The `spec.high-availability` field allows you to configure the number of replicas for all deployments managed by the operator.

The following configuration specifies a replica count of 3 for the workloads:

```yaml
apiVersion: operator.knative.dev/v1beta1
kind: KnativeEventing
metadata:
name: knative-eventing
namespace: knative-eventing
spec:
high-availability:
replicas: 3
```

The `replicas` field also configures the `HorizontalPodAutoscaler` resources based on the `spec.high-availability`. Let's say the operator includes the following HorizontalPodAutoscaler:

```yaml
apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
...
spec:
minReplicas: 3
maxReplicas: 5
```

If you configure `replicas: 2`, which is less than `minReplicas`, the operator transforms `minReplicas` to `1`.

If you configure `replicas: 6`, which is more than `maxReplicas`, the operator transforms `maxReplicas` to `maxReplicas + (replicas - minReplicas)` which is `8`.

## Override system deployments

If you would like to override some configurations for a specific deployment, you can override the configuration by using `spec.deployments` in the CR.
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