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[docs] Add a note about the new dry run option #6973

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[docs] Add a note about the new dry run option #6973

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7 changes: 7 additions & 0 deletions docs/source/routing/performance/caching/in-memory.mdx
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Expand Up @@ -46,6 +46,13 @@ To prevent increased latency upon query plan cache invalidation, the router prec

Precomputed plans will be cached before the router switches traffic over to the new schema.

<Tip>

You can also send the header `Apollo-Expose-Query-Plan: dry-run` for [generating query plans at runtime](https://www.apollographql.com/docs/graphos/reference/federation/query-plans#outputting-query-plans-with-headers) which can be used to warm up your cache instances with a custom defined operation list.

</Tip>


By default, the router warms up the cache with 30% of the queries already in cache, but it can be configured as follows:

```yaml title="router.yaml"
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