kubernetes/enhancements

Add CEL expressions support for Tolerations

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#5,500 opened on Aug 26, 2025

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help wantedsig/appssig/schedulingstage/alpha

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Description

Enhancement Description

This enhancement introduces and support CEL Taints and Tolerations.

Background

Current KEP #5471 focuses on integer operators and #5721 for SemVer support. Accommodating CEL expression would make scheduling more flexible and future-proof.

/sig scheduling /sig apps

Please keep this description up to date. This will help the Enhancement Team to track the evolution of the enhancement efficiently.

Contributor guide

Research direction
Study the existing KEP for CEL taints and tolerations, review the discussion links and the KEP PR, understand the scheduling framework and how tolerations are evaluated.
Tech stack
go
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
KubernetesGo
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40