Resource Orchestration Service (ROS) provides the tag management function to categorize stacks or templates by tags.

Each tag is a key-value pair. Take note of the following limits when you use ROS tags:

  • Each tag must be bound to a stack or template.
  • Up to 20 tags can be bound to a single stack or template.
  • The key of each tag bound to a stack or template must be unique. If a tag with the same key already exists, the tag value is overwritten by the new value.
  • Tags are region-specific and cannot be used across regions. For example, tags that are created in the China (Hangzhou) region are invisible to the China (Shanghai) region.