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Clean up code relating to decision_policy and forecast_policy. #3957

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@EvanKrall EvanKrall commented Sep 11, 2024

We'll need to ship a yelpsoa-configs change that stops setting forecast_policy before we ship this.

@EvanKrall EvanKrall changed the title U/krall/paasta 18298 delete forecast policy decision policy Clean up code relating to decision_policy and forecast_policy. Sep 11, 2024
@EvanKrall EvanKrall marked this pull request as ready for review September 11, 2024 19:07
@EvanKrall EvanKrall requested review from cuza, jfongatyelp and nemacysts and removed request for cuza and jfongatyelp September 11, 2024 19:07
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I could be convinced to drop the decision_policy changes, since those are slightly riskier, and tbh we should change how bespoke autoscaling works eventually.

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the decision policy changes seem pretty safe to me - imo, it's probably fine to leave them in

(and i agree that we should probably change how bespoke autoscaling works in the future - i think that even the current owners get confused by how this works now: we've had a non-zero amount of onpoint requests from these owners where they've thought something was broken since there were no HPAs :p)

:bespoke:
Allows a service author to implement their own autoscaling.
This policy results in no HPA being configured.
An external process should periodically decide how many replicas this service needs to run, and use the Paasta API to tell Paasta to scale.
See the :ref:`How to create a custom (bespoke) autoscaling method` section for details.
This is most commonly used by the Kew autoscaler.

:Anything other value:
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was this meant to be Any other value:?

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yes

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