Autoscaling apps

Description

Auto DevOps let's you set application scale using PRODUCTION_REPLICAS. We should make it easy to autoscale application replicas. Kubernetes has a concept of horizontal pod autoscaling (not to be confused with autoscaling the k8s nodes, like GKE has, currently in Beta). e.g.:

kubectl autoscale rc foo --min=2 --max=5 --cpu-percent=80

Proposal

• Building on https://gitlab.com/gitlab-org/gitlab-ce/issues/38543,
• Add a checkbox to enable autoscaling, set min and max values
• Possibly let users choose different autoscaling algorithms or criteria
• Expose these new values as variables

Links / references

Documentation blurb

Overview

What is it? Why should someone use this feature? What is the underlying (business) problem? How do you use this feature?

Use cases

Who is this for? Provide one or more use cases.

Feature checklist

Make sure these are completed before closing the issue, with a link to the relevant commit.

• Feature assurance
• Documentation
• Added to features.yml

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