messages.yaml

apiVersion: messaging.knative.dev/v1
kind: InMemoryChannel
metadata:
  name: messages
  
----------------------------------
inmem-uri-to-aws-k.binding.yaml

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: inmem-uri-to-aws-k
spec:
  sink:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: aws-kinesis-sink
    properties:
      stream: xxx
      accessKey: xxx
      secretKey: xxx
      region: us-west-1
  source:
      uri: "knative:channel/messages?apiVersion=messaging.knative.dev/v1&kind=InMemoryChannel"

----------------------------------
timer-to-inmem-integ.groovy

from("timer:x?repeatCount=1")
                .setBody().constant("hi from timer-to-inmem-integ")
                .to("knative:channel/messages?apiVersion=messaging.knative.dev/v1&kind=InMemoryChannel")

----------------------------------
Following integration didn't produce exception:

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: inmem-uri-to-aws-k
spec:
  sink:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: aws-kinesis-sink
    properties:
      stream: xxx
      accessKey: xxx
      secretKey: xxx
      region: us-west-1
  steps:
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: insert-header-action
    properties:
      name: "partition"
      value: "123"
  source:
      uri: "knative:channel/messages?apiVersion=messaging.knative.dev/v1&kind=InMemoryChannel"