envoyproxy/envoy

Support custom intervals for rate limit

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#40,222 opened on Jul 14, 2025

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area/ratelimitenhancementhelp wanted

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Description

Title: Support custom intervals for rate limit

Description:

Currently, rate limiting only supports predefined time units (Second, Minute, Hour, Day). This limitation forces users to work around scenarios where custom intervals (e.g., 30 seconds, 5 minutes) are required for precise rate limiting control.

Current Limitation

        rate_limit:
          requests_per_unit: 5
          unit: SECOND

Expected:

        rate_limit:
          requests_per_unit: 5
          unit: SECOND
          interval: 30

Envoy Gateway issue: https://github.com/envoyproxy/gateway/issues/6486

Contributor guide

Research direction
Extend the rate limit configuration struct to include an optional interval field, update the parser to read the new field, and modify the rate limiter logic to compute the window size based on the interval instead of hardcoded time units.
Tech stack
cpp
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
C++GitBazel
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70