Specifying the behaviour of the ConsumerID field when configuring Kafka pub/sub (#3935)

Signed-off-by: Simon Headley <[email protected]>
Co-authored-by: Yaron Schneider <[email protected]>

Author: KrylixZA

daprdocs/content/en/reference/components-reference/supported-pubsub/setup-apache-kafka.md

@@ -58,8 +58,8 @@ spec:
 | Field              | Required | Details | Example |
 |--------------------|:--------:|---------|---------|
 | brokers             | Y | A comma-separated list of Kafka brokers. | `"localhost:9092,dapr-kafka.myapp.svc.cluster.local:9093"`
-| consumerGroup       | N | A kafka consumer group to listen on. Each record published to a topic is delivered to one consumer within each consumer group subscribed to the topic. | `"group1"`
-| consumerID       | N | Consumer ID (consumer tag) organizes one or more consumers into a group. Consumers with the same consumer ID work as one virtual consumer; for example, a message is processed only once by one of the consumers in the group. If the `consumerID` is not provided, the Dapr runtime set it to the Dapr application ID (`appID`) value. | `"channel1"`
+| consumerGroup       | N | A kafka consumer group to listen on. Each record published to a topic is delivered to one consumer within each consumer group subscribed to the topic. If a value for `consumerGroup` is provided, any value for `consumerID` is ignored - a combination of the consumer group and a random unique identifier will be set for the `consumerID` instead. | `"group1"`
+| consumerID       | N | Consumer ID (consumer tag) organizes one or more consumers into a group. Consumers with the same consumer ID work as one virtual consumer; for example, a message is processed only once by one of the consumers in the group. If the `consumerID` is not provided, the Dapr runtime set it to the Dapr application ID (`appID`) value. If a value for `consumerGroup` is provided, any value for `consumerID` is ignored - a combination of the consumer group and a random unique identifier will be set for the `consumerID` instead. | `"channel1"`
 | clientID            | N | A user-provided string sent with every request to the Kafka brokers for logging, debugging, and auditing purposes. Defaults to `"namespace.appID"` for Kubernetes mode or `"appID"` for Self-Hosted mode. | `"my-namespace.my-dapr-app"`, `"my-dapr-app"`
 | authRequired        | N | *Deprecated* Enable [SASL](https://en.wikipedia.org/wiki/Simple_Authentication_and_Security_Layer) authentication with the Kafka brokers. | `"true"`, `"false"`
 | authType            | Y | Configure or disable authentication. Supported values: `none`, `password`, `mtls`, or `oidc` | `"password"`, `"none"`