Wikimedia Release Engineering Team/Seakeeper proposal/Kubernetes vendor selection

= Kubernetes vendor selection =

Overview
Kubernetes vendor criteria is in service to the Seakeeper proposal and informed by  Future CI requirements. Requirements herein defined are scoped such that they cover only the products, services and relationship WMF Release Engineering is seeking to establish with a Kubernetes PaaS provider for the purpose of rolling out and maintaining an Argo based CI system. These requirements must bolster those of the greater CI system—and should directly reference them when relevant—but may also be informed by considerations outside the precise purview of CI.

Discussion between primary participating stakeholders should drive the creation of these requirements and should be kept to the discussion page of this article as much as possible.

Classification
Requirements will be classified into four distinct categories, each of which is a quadrant formed by two main category axes function/quality and service/organization.


 * Function/Quality:
 * A functional requirement describes what the k8s vendor and service needs to do for us.
 * A quality (aka non-functional) requirement describes constraints on how the vendor and platform are to operate and deliver, generally expressed using some kind of  quality attribute.


 * Service/Organization:
 * A service requirement speaks to the k8s platform and supporting services being provided by the vendor.
 * An organization requirement speaks to the history/standing of the vendor organization itself, and its underlying ability to provide and support the service, akin to supplier evaluation criteria.

Categories


Combined, these main axes constitute four category quadrants we can use for classifying requirements.


 * Service Function (SF): A requirement that speaks to the behavior of the provided k8s platform and is informed by the material needs of Wikimedia technical contributors and WMF admins.
 * Examples:
 * SF1 – API supports standard k8s toolchain
 * SF2 – Allows custom resource definitions (CRDs)
 * SF3 – Supports single-node tenancy


 * Service Quality (SQ): A requirement that speaks to the qualities of the provided k8s PaaS and our needs around availability, scalability, performance, maintainability, etc. Some of these will constitute service level objectives (SLOs).
 * Examples:
 * SQ1 – Cluster availability exceeds 99.99%
 * SQ2 – Provides support within a 30-minute response window


 * Organization Function (OF): A requirement that speaks to the capacity of the vendor organization to deliver its service.
 * Examples:
 * OF1 – Financially stable as a k8s provider
 * OF2 – Demonstrates competency as a k8s operator


 * Organization Quality (OQ): A requirement that speaks to the vendor organization itself, its business practices and its alignment with WMF's culture and values.
 * Examples:
 * OQ1 – Contributes improvements to k8s upstream
 * OQ2 – Scored four-star EFF censorship rating
 * OQ3 – Scored four-star EFF data-request rating