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bluegreen strategy disclaimer for sticky sessions doc #1821

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4 changes: 4 additions & 0 deletions blueprints/sticky-sessions.html.md
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Expand Up @@ -6,6 +6,10 @@ author: rubys
date: 2024-07-17
---

<div class="important">
The methods described in this Blueprint won't work with a [Bluegreen deployment strategy](https://fly.io/docs/launch/deploy/#deployment-strategy) because all the Machines in your app are replaced—the old Machines are destroyed and their IDs are no longer relevant.
</div>

In a number of scenarios, it is important to ensure that certain requests are
routed to a specific Machine. This frequently is expressed in the form of
wanting an entire user's session to be processed by the same Machine.
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