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<h1 id="title">Istio 0.3</h1>
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<h2 id="general">General</h2>
<p>Starting with 0.3, Istio is switching to a monthly release cadence. We hope this will help accelerate our ability
to deliver timely improvements. See <a href="/v0.8/about/feature-stages/">here</a> for information on the state of individual features
for this release.</p>
<p>This is a fairly modest release in terms of new features as the team put emphasis on internal
infrastructure work to improve our velocity. Many bugs and smaller issues have been addressed and
overall performance has been improved in a number of areas.</p>
<h2 id="security">Security</h2>
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<p><strong>Secure Control Plane Communication</strong>. Mixer and Pilot are now secured with mutual TLS, just like all services in a mesh.</p>
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<p><strong>Selective Authentication</strong>. You can now control authentication on a per-service basis via service annotations,
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<h2 id="networking">Networking</h2>
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<li><strong>Egress rules for TCP</strong>. You can now specify egress rules that affect TCP-level traffic.</li>
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<h2 id="policy-enforcement-and-telemetry">Policy enforcement and telemetry</h2>
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<p><strong>Improved Caching</strong>. Caching between Envoy and Mixer has gotten substantially better, resulting in a
significant drop in average latency for authorization checks.</p>
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<li>
<p><strong>Improved list Adapter</strong>. The Mixer &lsquo;list&rsquo; adapter now supports regular expression matching. See the adapter's
<a href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/list/">configuration options</a> for details.</p>
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<p><strong>Config Validation</strong>. Mixer does more extensive validation of configuration state in order to catch problems earlier.
We expect to invest more in this area in coming releases.</p>
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<p>If you're into the nitty-gritty details, you can see our more detailed low-level
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<span>github</span>
<a title="GitHub is where development takes place on Istio code"
href="https://github.com/istio/community" aria-label="GitHub">
<svg viewBox="0 0 478.165 478.165">
<path d="M349.22,55.768c6.136,14.046,10.241,37.556,4.224,54.69
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</svg>
</a>
</div>
<div class="icon">
<span>drive</span>
<a title="Access our team drive if you'd like to take a look at the Istio technical design documents"
href="https://groups.google.com/forum/#!forum/istio-team-drive-access" aria-label="team drive">
<svg viewBox="0 0 207.027 207.027">
<path d="M69.866,15.557L0,138.919l28.732,52.552l143.288-0.029l35.008-59.588L136.39,15.735L69.866,15.557z M17.166,139.046
L74.268,38.205L91.21,67.783L33.24,168.447L17.166,139.046z M99.841,82.851l23.805,41.558l-47.732-0.006L99.841,82.851z
M163.434,176.443l-117.332,0.024l21.53-37.065l64.606,0.008l0.067,0.119l52.865-0.085L163.434,176.443z M140.932,124.411
L90.157,35.767l-2.966-5.178l40.751,0.121l57.003,93.706L140.932,124.411z"/>
</svg>
</a>
</div>
<div class="icon">
<span>working groups</span>
<a title="If you'd like to contribute to the Istio project, consider participating in our working groups"
href="https://github.com/istio/community/blob/master/WORKING-GROUPS.md" aria-label="working groups">
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<path d="M219.927,11.558c-23.854,0-37.057,12.362-36.814,36.182c0.348,32.623,14.211,52.414,36.814,52.068
c0,0,36.802,1.492,36.802-52.068C256.729,23.918,244.294,11.558,219.927,11.558z"/>
<path d="M285.017,124.567l-36.77-14.659l-8.608-7.256c-2.274-1.922-5.636-1.78-7.741,0.317l-11.973,11.904l-12.008-11.907
c-2.109-2.094-5.465-2.229-7.736-0.313l-8.611,7.256l-36.77,14.661c-11.842,4.715-11.83,46.647-12.848,50.497h155.93
C296.866,171.228,296.862,129.28,285.017,124.567z"/>
<path d="M77.976,228.568c0,0,36.801,1.492,36.801-52.068c0-23.82-12.434-36.182-36.801-36.182
c-23.854,0-37.057,12.362-36.814,36.182C41.509,209.124,55.372,228.915,77.976,228.568z"/>
<path d="M143.065,253.329l-36.77-14.658l-8.609-7.256c-2.275-1.923-5.635-1.781-7.742,0.315l-11.971,11.904l-12.008-11.908
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<path d="M361.878,228.568c0,0,36.801,1.492,36.801-52.068c0-23.82-12.434-36.182-36.801-36.182
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<path d="M426.968,253.329l-36.77-14.658l-8.609-7.256c-2.273-1.923-5.635-1.781-7.742,0.315l-11.971,11.904l-12.008-11.908
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C438.817,299.988,438.812,258.042,426.968,253.329z"/>
</svg>
</a>
</div>
<div class="icon">
<span>slack</span>
<a title="Interactively discuss development issues with the Istio community on Slack (invitation-only)"
href="https://istio.slack.com" aria-label="slack">
<svg viewBox="0 0 31.444 31.443">
<path d="M31.202,16.369c-0.62-1.388-2.249-2.011-3.637-1.391l-1.325,0.594l-3.396-7.591l1.325-0.592
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