Limits on tag keys

• A tag key starting with qcs: or project is a system reserved tag key, so these prefixes cannot be used when creating a tag key.
• Can only contain characters encoded in UTF-8, spaces, numbers, or special characters including + - = ._ : / @.
• Tag key length is 127 characters (encoded in UTF-8).
• A tag key is case sensitive.

Limits on tag values

• Can only contain characters encoded in UTF-8, spaces, numbers, or special characters including + - = ._ : / @.
• Tag value length is 255 characters (encoded in UTF-8).
• A tag value is case sensitive.

Limits on the number of tags

• Resource dimension: A resource can have at most 50 different keys.
• Tag dimension:
  • A user can have at most 1,000 different keys.
  • A key can have at most 1,000 values.