Add 1.0.3 release notes (#2807)

(cherry picked from commit 9c57b614b0)

content/about/notes/1.0.3/index.md

@@ -0,0 +1,38 @@
+---
+title: Istio 1.0.3
+weight: 89
+icon: notes
+---
+
+This release addresses some critical issues found by the community when using Istio 1.0.2.
+This release note describes what's different between Istio 1.0.2 and Istio 1.0.3.
+
+{{< relnote_links >}}
+
+## Behavior changes
+
+- [Validating webhook](/help/ops/setup/validation) is now mandatory. Disabling it may result in Pilot crashes.
+
+- [Service entry](/docs/reference/config/istio.networking.v1alpha3/#ServiceEntry) no longer allows wildcard (`*`) DNS resolution. The API has never allowed this, however `ServiceEntry` was erroneously excluded from validation in the previous release.
+
+- The core dump path for `istio-proxy` has changed to `/var/lib/istio`.
+
+## Networking
+
+- [Mutual TLS](/docs/tasks/security/mutual-tls) Permissive mode is enabled by default.
+
+- Pilot performance and scalability has been greatly enhanced. Pilot now delivers endpoint updates to 500 sidecars in under 1 second.
+
+- Default [trace sampling](/docs/tasks/telemetry/distributed-tracing/#trace-sampling) is set to 1%.
+
+## Policy and telemetry
+
+- Mixer (`istio-telemetry`) now supports load shedding based on request rate and expected latency.
+
+- Mixer client (`istio-policy`) now supports `FAIL_OPEN` setting.
+
+- Istio Performance dashboard added to Grafana.
+
+- Reduced `istio-telemetry` CPU usage by 10%.
+
+- Eliminated `statsd-to-prometheus` deployment. Prometheus now directly scrapes from `istio-proxy`.

content/blog/2018/announcing-1.0.3/index.md

@@ -0,0 +1,9 @@
+---
+title: Announcing Istio 1.0.3
+description: Istio 1.0.3 patch release.
+publishdate: 2018-10-30
+attribution: The Istio Team
+weight: 80
+---
+
+We're pleased to announce the availability of Istio 1.0.3. Please check out the [release notes](/about/notes/1.0.3/) to learn more and download this update.