RLAAS (Rate Limiting As A Service): Rate Limiting Across Modern Systems

RLAAS (Rate Limiting As A Service) is an open-source, policy-driven platform written in Go that applies consistent rate limiting across HTTP, gRPC, telemetry, events, and sidecars using a unified engine. It addresses common pain points like log floods, metric storms, Kafka cascades, and fragmented per-service throttling by treating rate limiting as a platform capability rather than just a gateway feature. The platform supports multiple algorithms—Token Bucket, Sliding Window, Fixed Window, Leaky Bucket, and Concurrent Request Limiter—that can run simultaneously across different policies.