# Official sources

Use this reference only when you need source grounding for Alibaba Cloud event-driven service behavior or the detailed source list.

## Alibaba Cloud documentation

Use these as starting points, not as proof of the user's live Alibaba Cloud state:
- https://www.alibabacloud.com/help/en/eventbridge/latest/what-is-eventbridge
- https://www.alibabacloud.com/help/en/eventbridge/latest/event-bus-overview
- https://www.alibabacloud.com/help/en/message-service/latest/what-is-mns
- https://www.alibabacloud.com/help/en/message-service/latest/configure-a-dead-letter-queue
- https://www.alibabacloud.com/help/en/apsaramq-for-rocketmq/latest/what-is-rocketmq
- https://www.alibabacloud.com/help/en/apsaramq-for-rocketmq/latest/ordered-messages
- https://www.alibabacloud.com/help/en/mse/latest/overview-of-mse

## Grounding rule

Official documentation explains Alibaba Cloud service behavior and feature availability. It does not prove the user's current queue configuration, consumer group state, or lag metrics. Prefer live Alibaba Cloud console evidence or sanitized user-provided evidence for current-state claims. CN-* mainland China region feature availability may differ from international regions — always confirm region context before citing feature availability.
