lte and agile.</p></li><li><p><em>Reliability</em>. Mixer and its open-ended extensibility model represents the most complex parts of the data path processing pipeline. By hosting this functionality in Mixer rather than Envoy, it creates distinct failure domains which enables Envoy to continue operating even if Mixer fails, preventing outages.</p></li><li><p><em>Isolation</em>. Mixer provides a level of insulation between Istio and the infrastructure backends. Each Envoy instance can be configured to have a