re backends.
It is designed as a stand-alone component, separate from <a href=https://www.envoyproxy.io/>Envoy</a>, and has a simple extensibility model
to enable Istio to interoperate with a wide breadth of backends. Mixer is inherently easier to extend
than Envoy is.</p><p>Mixer is an attribute processing engine that uses operator-supplied configuration to map request attributes from the Istio proxy into calls
to the infrastructure backends systems via a pluggable set of adapters. Adapters enable <strong>