Architecture Overview

RLAAS — System Architecture

Rate Limiting As A Service · Policy-driven traffic control

Clients

HTTP Service

rlaas-agent

Sidecar

SDK

Go / Python / Java / TS / .NET

gRPC Service

Provider Adapters

HTTP Adapter

gRPC Adapter

OpenTelemetry

logs & spans

Datadog

logs & metrics

Fluent Bit

Envoy / Istio

Kafka

Policy Engine

Policy Evaluator

match scope + expression → select algorithm → decide

Algorithms

Token Bucket

Sliding Window

Fixed Window

Leaky Bucket

Concurrent Request Limiter

Counter Store

Redis / Memory

Policy Store

YAML / API / PG / Oracle

Decision

Actions

✅

ALLOW

🛑

DENY

⏳

THROTTLE

🗑️

DROP

👁️

SHADOW

rlaas-io.github.io/rlaas