Dear Customer,

To enhance the stability and performance of our services, we will be performing a scheduled upgrade on the EventBridge service.

1. Maintenance Schedule

The upgrades will be conducted in batches for the following regions. Please note all times are listed in Beijing Time (UTC+8).

December 16, 2025, 22:00 - December 17, 2025, 05:00 (UTC+8) Regions: Chengdu, Hohhot

December 18, 2025, 22:00 - December 19, 2025, 05:00 (UTC+8) Regions: Shenzhen, Ulanqab, Heyuan, Guangzhou, Qingdao

December 23, 2025, 22:00 - December 24, 2025, 05:00 (UTC+8) Regions: Zhangjiakou, Kuala Lumpur, Jakarta, Manila, Bangkok

December 25, 2025, 22:00 - December 26, 2025, 05:00 (UTC+8) Regions: Beijing, Hong Kong, Frankfurt, London, Riyadh

January 6, 2026, 22:00 - January 7, 2026, 05:00 (UTC+8) Regions: Shanghai, Tokyo, Seoul, Wuhan-Local Region

January 8, 2026, 22:00 - January 9, 2026, 05:00 (UTC+8) Regions: Hangzhou, Singapore, Silicon Valley, Virginia

2. Scope of Change

The EventBridge service, including its Event Rules and Event Streams, will be upgraded in the specified regions.

3. Potential Impact

During the maintenance window, you may experience the following:

(1) Tasks for Event Rules and Event Streams will be reloaded, which may cause brief processing delays.

(2) There is a possibility of duplicate event deliveries to target endpoints. Please ensure your applications are designed to be idempotent to handle such cases.

We apologize for any inconvenience this may cause. If you have any questions, please feel free to contact us by submitting a support ticket.