</p>
<p>Mixer doesn’t yet do canarying of config changes, but we expect this to come online as part of Istio’s ongoing work on reliable config distribution.</p>
<h3 id="cache-tuning">Cache tuning</h3>
<p>We have yet to fine-tune the sizes of the sidecar and Mixer caches. This work will focus on achieving the highest performance possible using the least amount of resources.</p>
<h3 id="cache-sharing">Cache sharing</h3>
<p>At the moment, each Mixer instance operates independently of all other instances. A