CloudEvents payload format

migrating-scs-2x-3x-cloud-events.md

 var event =
    CloudEventBuilder.v1()
        .withId(UUID.randomUUID().toString())
        .withType(payloadDataType)
        .withSource(URI.create("/origin-source"))
        .withTime(OffsetDateTime.now())
        .withExtension("partitionkey", keyValue)
        .withData(payloadInBytes)
        .build();