cherry pick 1.1.9 release notes into release-1.1 branch (#4466)

content/about/notes/1.1.9/index.md

@@ -0,0 +1,10 @@
+---
+title: Istio 1.1.9
+publishdate: 2019-06-17
+icon: notes
+release: 1.1.9
+---
+
+This release includes several bug fixes and improvements to robustness.  This release note describes what's different between Istio 1.1.8 and Istio 1.1.9.
+
+{{< relnote >}}

content/blog/2019/announcing-1.1.9/index.md

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+---
+title: Announcing Istio 1.1.9
+description: Istio 1.1.9 patch release.
+publishdate: 2019-06-17
+attribution: The Istio Team
+release: 1.1.9
+---
+
+We're pleased to announce the availability of Istio 1.1.9. Please see below for what's changed.
+
+{{< relnote >}}

content/boilerplates/notes/1.1.9.md

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+## Bug fixes
+
+- Prevent overly large strings from being sent to Prometheus ([Issue 14642](https://github.com/istio/istio/issues/14642)).
+- Reuse previously cached JWT public keys if transport errors are encountered during renewal ([Issue 14638](https://github.com/istio/istio/issues/14638)).
+- Bypass JWT authentication for HTTP OPTIONS methods to support CORS requests ([Issue 2160](https://github.com/istio/proxy/issues/2160)).
+- Fix Envoy crash caused by the Mixer filter ([Issue 14707](https://github.com/istio/istio/issues/14707)).
+
+## Small enhancements
+
+- Expose cryptographic signature verification functions to `Lua` Envoy filters ([Envoy Issue 7009](https://github.com/envoyproxy/envoy/issues/7009)).

data/args.yml

@@ -2,7 +2,7 @@
 version: "1.1"
 
 # The full Istio version identifier the docs describe
-full_version: "1.1.8"
+full_version: "1.1.9"
 
 # The year to display in copyright notices
 copyright_year: 2019