a-updatebutton="LEARN ABOUT ISTIO 1.0.9" data-updatehref=/v1.3/news/2019/announcing-1.0.9/>
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<a class=btn href=https://archive.istio.io/v1.0>1.0.3 DOCS</a>
<a class=btn href=https://github.com/istio/istio/compare/1.0.2...1.0.3>CHANGES IN 1.0.3</a></div><h2 id=behavior-changes>Behavior changes</h2><ul><li><p><a href=/v1.3/docs/ops/troubleshooting/validation>Validating webhook</a> is now mandatory. Disabling it may result in Pilot crashes.</p></li><li><p><a href=/v1.3/docs/reference/con