Reviewed-by: Rumpler, Mihály <mihaly.rumpler@t-systems.com> Co-authored-by: Wei, Hongmin <weihongmin1@huawei.com> Co-committed-by: Wei, Hongmin <weihongmin1@huawei.com>
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Constraints and Limitations
The following are basic constraints on using tags:
Item |
Specifications |
---|---|
Maximum number of key-value pairs you can add for each resource |
20 |
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 |
Predefined tags cannot be identical. Either their keys or values must be different. If you create a predefined tag that is identical to an existing predefined tag, the existing predefined tag will be overwritten. |
Tag keys |
A tag key can contain a maximum of 36 characters, including only digits, letters, hyphens (-), at signs (@), and underscores (_). |
Tag values |
A tag value can contain a maximum of 43 characters, including only digits, letters, hyphens (-), at signs (@), and underscores (_). |

Not all resources are supported by TMS. For which services and resources are supported, see TMS and Other Services.