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docs: Add info about variable item key name restrictions #15966

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Jan 30, 2023
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docs: Add info about variable item key name restrictions #15966

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7 changes: 7 additions & 0 deletions website/content/docs/commands/var/put.mdx
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Expand Up @@ -44,6 +44,13 @@ includes alphanumeric characters and the special characters `-`, `_`, `~`, and
`/`. Paths may be up to 128 bytes long. The following regex matches the allowed
paths: `^[a-zA-Z0-9-_~/]{1,128}$`

The keys for the items in a variable may contain any character, but keys
containing characters outside the set of Unicode letters, Unicode digits, and
the underscore (`_`) can not be read directly using dotted references in Nomad's
template engine. Instead, they require the use of the `index` template function
to directly access their values. This does not impact cases where the keys and
values are read using the `range` function.

Variable items are restricted to 16KiB in size. This limit is calculated by
taking the sum of the length in bytes of all of the unencrypted keys and values.

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