app-messagebroker-kafka.yaml

apiVersion: apiextensions.crossplane.io/v1
kind: Composition
metadata:
  name: kafka.mb.aws.salaboy.com
  labels:
    type: dev
    provider: aws
    kind: kafka
spec:
  writeConnectionSecretsToNamespace: crossplane-system
  compositeTypeRef:
    apiVersion: salaboy.com/v1alpha1
    kind: MessageBroker
  resources:
    - name: kafka
      base:
        apiVersion: kafka.aws.crossplane.io/v1alpha1
        kind: Cluster
        metadata:
          annotations:
            crossplane.io/external-name: # patched
        spec:
          providerConfigRef:
            name: default
          forProvider:
            clusterName: kafka
            kafkaVersion: 2.6.1
            numberOfBrokerNodes: 2
            region: us-west-2
            brokerNodeGroupInfo:
              instanceType: kafka.t3.small
              storageInfo: 
                ebsStorageInfo:
                  volumeSize: 1
          writeConnectionSecretToRef:
            namespace: crossplane-system
            name: kafka
      patches:
        - fromFieldPath: metadata.name
          toFieldPath: metadata.annotations[crossplane.io/external-name]
          policy:
            fromFieldPath: Required
        - fromFieldPath: metadata.name
          toFieldPath: metadata.name
          transforms:
            - type: string
              string:
                fmt: "%s-kafka"