Help Center> Tag Management Service> Service Overview> Constraints and Limitations
Updated on 2024-04-11 GMT+08:00
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Constraints and Limitations

The following are basic constraints on using tags:

Table 1 Constraints

Item

Specifications

Maximum number of key-value pairs you can add for each resource

10

Tags of each resource

For each resource, each tag key must be unique, and each tag key can have only one tag value.

The maximum predefined tags that each account can create.

500

Predefined tags

If the created predefined tag is the same as an existing predefined tag, the existing predefined tag is overwritten. If only keys are the same and values are different, both the tags are available.

Tag keys

A tag key can contain a maximum of 36 characters, including digits, letters, underscores (_), hyphens (-), and at signs (@).

Tag values

A tag value can contain a maximum of 43 characters, including digits, letters, underscores (_), periods (.), hyphens (-), and at signs (@).

Not all resources are supported by TMS. For which services and resources are supported, you can go to the service console to check it out..