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Document limitations around default topology spread constraints #48798

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Document limitations around default topology spread constraints #48798

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8 changes: 8 additions & 0 deletions content/en/docs/concepts/scheduling-eviction/topology-spread-constraints.md
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Expand Up @@ -529,6 +529,11 @@ profiles:
whenUnsatisfiable: ScheduleAnyway
defaultingType: List
```

If you are using the default cluster-autoscaler make sure not to use `DoNotSchedule` as it
[does not know about custom default constraints](https://github.com/kubernetes/autoscaler/issues/3879)
or you might end up with unschedulable pods.

### Built-in default constraints {#internal-default-constraints}

{{< feature-state for_k8s_version="v1.24" state="stable" >}}
Expand Down Expand Up @@ -621,6 +626,9 @@ section of the enhancement proposal about Pod topology spread constraints.
You can work around this by using a cluster autoscaling tool that is aware of
Pod topology spread constraints and is also aware of the overall set of topology
domains.
- [cluster-autoscaler does not know about custom default constraints](https://github.com/kubernetes/autoscaler/issues/3879)
and will ignore them. If you use `DoNotSchedule` in your constraints this will result
in unschedulable pods.

## {{% heading "whatsnext" %}}

Expand Down