envoyproxy/gateway

[stats] Add support for `track_remaining` in Circuit Breaker configuration

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#7,743 opened on Dec 15, 2025

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help wanted

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Description

Description: Envoy Circuit Breaker configuration supports the track_remaining boolean to collection of the number of resources remaining until the circuit breakers open in envoy and expose them in envoy stats. This field defaults to false and cannot be enabled when using Envoy Gateway.

When this field is true, some additional circuit breaker metrics are exposed (in prometheus, for instance)

Such metrics are extremely useful to proactively detect if a circuit breaker is about to open. Can this field be exposed in BackendTrafficPolicy alongside other circuit breaker settings ?

[Relevant Links:] Envoy reference for track_remaining

Envoy Circuit Breaker stats documentation

Contributor guide

Research direction
Check the existing circuit breaker implementation in BackendTrafficPolicy and add the track remaining field to the circuit breaker thresholds.
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.
Half day
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.
Mostly clear
Prerequisites
GoKubernetesEnvoy
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70