ec09>custom protocol handling</a>.</p><p>The Envoy model imposed a monolithic build process, and required extensions to be written in C++,
limiting the developer ecosystem. Rolling out a new extension to the fleet required pushing new
binaries and rolling restarts, which can be difficult to coordinate, and risk downtime. This also
incentivized developers to upstream extensions into Envoy that were used by only a small
percentage of deployments, just to piggyback on its release mechanisms.</p><p>Over time so