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HPA Algorithm Information Improvements (#9780)

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* Update HPA docs with more algorithm details

The HPA docs pointed to an out-of-date document for information on the
algorithm details, which users were finding confusing.  This sticks a
section on the algorithm in the HPA docs instead, documenting both
general behavior and corner cases.

* Add glossary info, HPA docs on quantities

People often ask about the quantity notation when working with the
metrics APIs, so this adds a glossary entry on quantities (since they're
used elsewhere in the system), and a short explantation in the HPA walkthough.

* Information about HPA readiness and stabilization

This adds information about the new changes to HPA readiness and
stabilization from kubernetes/features#591, and other minor changes that
landed in Kubernetes 1.12.

* Update horizontal-pod-autoscale.md
This commit is contained in:
Solly Ross
2018-09-12 00:17:42 -04:00
committed by k8s-ci-robot
parent e1e655507d
commit 93c0bb9347
3 changed files with 126 additions and 8 deletions
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content/en/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough.md
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@@ -432,6 +432,16 @@ was capped by the maximum or minimum of the HorizontalPodAutoscaler. This is an
you may wish to raise or lower the minimum or maximum replica count constraints on your
HorizontalPodAutoscaler.
## Appendix: Quantities
All metrics in the HorizontalPodAutoscaler and metrics APIs are specified using
a special whole-number notation known in Kubernetes as a *quantity*. For example,
the quantity `10500m` would be written as `10.5` in decimal notation. The metrics APIs
will return whole numbers without a suffix when possible, and will generally return
quantities in milli-units otherwise. This means you might see your metric value fluctuate
between `1` and `1500m`, or `1` and `1.5` when written in decimal notation. See the
[glossary entry on quantities](/docs/reference/glossary/quantity.md) for more information.
## Appendix: Other possible scenarios
### Creating the autoscaler declaratively