|Upgrade the kernel version
||Differences before and after the kernel version of an instance is upgraded are distinguished.
The versions before the upgrade are unified to V2.x.x and those after the upgrade
are unified to V3.x.x.
||Instance usage changes
|Cross-service data exchange rules
- Data is exchanged across cloud services by using rules, including data inbound rules,
data outbound rules, and rules for client status notification.
- Rules can be managed in the console or by calling API operations.
||Since V3.x.x, Message Queue for MQTT no longer uses Message Queue for Apache RocketMQ to store messages, and topics of the two services are no longer interconnected by
default. To exchange data between the two services, you must create and use rules.Message Queue for MQTT Message Queue for MQTT V3.x.x provides separate API operations to manage topics.