9%">
        <a class="not-for-endnotes" href="/v0.8/blog/2017/img/mixer-spof-myth-2.svg">
            <img class="element-to-stretch" src="/v0.8/blog/2017/img/mixer-spof-myth-2.svg" alt="Istio Topology" title="Istio Topology" />
        </a>
    </div>
    <figcaption>Istio Topology</figcaption>
</figure>

<p>The Envoy sidecar logically calls Mixer before each request to perform precondition checks, and after each request to report telemetry.
The sidecar has local caching such that a relatively large perce