caches and sharding, Mixer reduces average observed latencies across the mesh.</p></li></ul><p>We’ll explain this in more detail below.</p><h2 id="how-we-got-here">How we got here</h2><p>For many years at Google, we’ve been using an internal API &amp; service management system to handle the many APIs exposed by Google. This system has been fronting the world’s biggest services (Google Maps, YouTube, Gmail, etc) and sustains a peak rate of hundreds of millions of QPS. Although this system has served us