"Scaling Our Rate Limits to Prepare for a Billion Active Certificates"
https://letsencrypt.org/2025/01/30/scaling-rate-limits/
Nice blog post about Let's Encrypt scaling up by introducing rate limiting and going from MariaDB to Redis for their rate limiting approach while using a non-sliding window rate limiting algorithm called Generic Cell Rate Algorithm (GCRA) for managing request flow.
„What sets GCRA apart is its ability to automatically refill capacity gradually and continuously. Unlike sliding windows, where users must wait for an entire time block to reset, GCRA allows users to retry as soon as enough time has passed to maintain the steady rate. This dynamic pacing reduces frustration and provides a smoother, more predictable experience for subscribers.“
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