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5 changes: 4 additions & 1 deletion docs/reference/keystore.md
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Expand Up @@ -136,7 +136,10 @@ bin/logstash-keystore add ES_USER ES_PWD
When prompted, enter a value for each key.

::::{note}
Key values are limited to ASCII letters (`a`-`z`, `A`-`Z`), numbers (`0`-`9`), underscores (`_`), and dots (`.`); they must be at least one character long and cannot begin with a number.
Key values are limited to:

* {applies_to}`stack: ga 9.0.1` ASCII letters (`a`-`z`, `A`-`Z`), numbers (`0`-`9`), underscores (`_`), and dots (`.`); they must be at least one character long and cannot begin with a number.
* {applies_to}`stack: ga 9.0.0` ASCII characters including digits, letters, and a few special symbols.
::::


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3 changes: 2 additions & 1 deletion docs/reference/persistent-queues.md
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Expand Up @@ -81,7 +81,8 @@ If you want to define values for a specific pipeline, use [`pipelines.yml`](/ref

To avoid losing data in the persistent queue, you can set `queue.checkpoint.writes: 1` to force a checkpoint after each event is written. Keep in mind that disk writes have a resource cost. Setting this value to `1` ensures maximum durability, but can severely impact performance. See [Controlling durability](#durability-persistent-queues) to better understand the trade-offs.


`queue.checkpoint.interval` {applies_to}`stack: deprecated 9.1`
: Sets the interval in milliseconds when a checkpoint is forced on the head page. Default is `1000`. Set to `0` to eliminate periodic checkpoints.

## Configuration notes [pq-config-notes]

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