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add documentation
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dbenque committed Dec 2, 2022
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1 change: 1 addition & 0 deletions vertical-pod-autoscaler/FAQ.md
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`memory-aggregation-interval-count` | Int64 | The number of consecutive memory-aggregation-intervals which make up the MemoryAggregationWindowLength which in turn is the period for memory usage aggregation by VPA. In other words, MemoryAggregationWindowLength = memory-aggregation-interval * memory-aggregation-interval-count. | model.DefaultMemoryAggregationIntervalCount
`memory-histogram-decay-half-life` | Duration | The amount of time it takes a historical memory usage sample to lose half of its weight. In other words, a fresh usage sample is twice as 'important' as one with age equal to the half life period. | model.DefaultMemoryHistogramDecayHalfLife
`cpu-histogram-decay-half-life` | Duration | The amount of time it takes a historical CPU usage sample to lose half of its weight. | model.DefaultCPUHistogramDecayHalfLife
`cpu-integer-post-processor-enabled` | Bool | Enable the CPU integer post processor | false

### What are the parameters to VPA updater?

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12 changes: 12 additions & 0 deletions vertical-pod-autoscaler/README.md
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- [Capping to Limit Range](#capping-to-limit-range)
- [Resource Policy Overriding Limit Range](#resource-policy-overriding-limit-range)
- [Starting multiple recommenders](#starting-multiple-recommenders)
- [Using CPU management with static policy](#using-cpu-management-with-static-policy)
- [Known limitations](#known-limitations)
- [Related links](#related-links)

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You can then choose which recommender to use by setting `recommenders` inside the `VerticalPodAutoscaler` spec.
### Using CPU management with static policy
If you are using the [CPU management with static policy](https://kubernetes.io/docs/tasks/administer-cluster/cpu-management-policies/#static-policy) for some containers,
you probably want the CPU recommendation to be an integer. A dedicated recommendation pre-processor can perform a round up on the CPU recommendation. Recommendation capping still applies after the round up.
To activate this feature, pass the flag `--cpu-integer-post-processor-enabled` when you start the recommender.
The pre-processor only acts on containers having a specific configuration. This configuration consists in an annotation on your VPA object for each impacted container.
The annotation format is the following:
```
vpa-post-processor.kubernetes.io/{containerName}_integerCPU=true
```
# Known limitations
* Whenever VPA updates the pod resources, the pod is recreated, which causes all
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