The following restrictions apply to tags in Amazon Data Firehose.
Basic restrictions
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The maximum number of tags per resource (stream) is 50.
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Tag keys and values are case-sensitive.
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You can't change or edit tags for a deleted stream.
Tag key restrictions
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Each tag key must be unique. If you add a tag with a key that's already in use, your new tag overwrites the existing key-value pair.
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You can't start a tag key with
aws:because this prefix is reserved for use by AWS. AWS creates tags that begin with this prefix on your behalf, but you can't edit or delete them. -
Tag keys must be between 1 and 128 Unicode characters in length.
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Tag keys must consist of the following characters: Unicode letters, digits, white space, and the following special characters:
_ . / = + - @.
Tag value restrictions
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Tag values must be between 0 and 255 Unicode characters in length.
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Tag values can be blank. Otherwise, they must consist of the following characters: Unicode letters, digits, white space, and any of the following special characters:
_ . / = + - @.
