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Documentation: Educate about idempotency of user-defined functions #714

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amotl merged 1 commit into from
Jul 12, 2026
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Documentation: Educate about idempotency of user-defined functions #714

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3 changes: 3 additions & 0 deletions docs/configure/transformation.md
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Expand Up @@ -269,6 +269,9 @@ Those [topic options](#topic-options) *do **not** accept* a user-defined functio
- `topic`
- `qos`

Functions get invoked once per target. If idempotency of a custom function is
not guaranteed (function(msg) returns always the same result), the message
might not get dispatched to every target the same way.

### Getting started

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