Backport of docs: Deprecations for connect-native SDK and specific connect native APIs into release/1.16.x (#17941)

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---------

Co-authored-by: David Yu <dyu@hashicorp.com>

website/content/docs/connect/native/go.mdx

@@ -7,6 +7,13 @@ description: >-
 
 # Service Mesh Native Integration for Go Applications
 
+<Note>
+
+The Connect Native golang SDK is currently deprecated and will be removed in a future Consul release.
+The SDK will be removed when the long term replacement to native application integration (such as a proxyless gRPC service mesh integration) is delivered. Refer to [GH-10339](https://github.com/hashicorp/consul/issues/10339) for additional information and to track progress toward one potential solution that is tracked as replacement functionality.
+
+</Note>
+
 We provide a library that makes it drop-in simple to integrate Consul service mesh
 with most [Go](https://golang.org/) applications. This page shows examples
 of integrating this library for accepting or establishing mesh-based

website/content/docs/connect/native/index.mdx

@@ -7,10 +7,17 @@ description: >-
 
 # Service Mesh Native App Integration Overview
 
-~> **Note:** The Native App Integration does not support many of the Consul's service
-mesh features, and is not under active development.
-The [Envoy proxy](/consul/docs/connect/proxies/envoy) should be used for most production
-environments.
+<Note>
+
+The Connect Native Golang SDK and `v1/agent/connect/authorize`, `v1/agent/connect/ca/leaf`, 
+and `v1/agent/connect/ca/roots` APIs are deprecated and will be removed in a future release. Although Connect Native 
+will still operate as designed, we do not recommend leveraging this feature because it is deprecated and will be removed 
+removed when the long term replacement to native application integration (such as a proxyless gRPC service mesh integration) is delivered. Refer to [GH-10339](https://github.com/hashicorp/consul/issues/10339) for additional information and to track progress toward one potential solution that is tracked as replacement functionality.
+
+The Native App Integration does not support many of the Consul's service mesh features, and is not under active development.
+The [Envoy proxy](/consul/docs/connect/proxies/envoy) should be used for most production environments. 
+
+</Note>
 
 Applications can natively integrate with Consul's service mesh API to support accepting
 and establishing connections to other mesh services without the overhead of a

website/content/docs/connect/proxies/integrate.mdx

@@ -7,6 +7,17 @@ description: >-
 
 # Custom Proxy Configuration for Service Mesh
 
+<Note>
+
+ The Connect Native Golang SDK and `v1/agent/connect/authorize`, `v1/agent/connect/ca/leaf`, 
+ and `v1/agent/connect/ca/roots` APIs are deprecated and will be removed in a future release. Although Connect Native 
+ will still operate as designed, we do not recommend leveraging this feature because it is deprecated and will be removed when the long term replacement to native application integration (such as a proxyless gRPC service mesh integration) is delivered. Refer to [GH-10339](https://github.com/hashicorp/consul/issues/10339) for additional information and to track progress toward one potential solution that is tracked as replacement functionality.
+
+ The Native App Integration does not support many of the Consul's service mesh features, and is not under active development.
+ The [Envoy proxy](/consul/docs/connect/proxies/envoy) should be used for most production environments. 
+
+</Note>
+
 This topic describes the process and API endpoints you can use to extend proxies for integration with Consul.
 
 ## Overview

website/content/docs/release-notes/consul/v1_16_x.mdx

@@ -51,6 +51,15 @@ We are pleased to announce the following Consul updates.
 
   Consul's API gateway is the recommended alternative to ingress gateway. For ingress gateway features not currently supported by API gateway, equivalent functionality will be added to API gateway over the next several releases of Consul.
 
+- **Connect Native Golang SDK:** The Connect Native [Golang SDK](https://github.com/hashicorp/consul/tree/main/connect) is deprecated and will be removed in a future release. No further enhancements or maintenance is expected in the future releases. We will remove the SDK when the long term replacement to native application integration (such as a proxyless gRPC service mesh integration) is delivered. Refer to [GH-10339](https://github.com/hashicorp/consul/issues/10339) for additional information and to track progress toward one potential solution that is tracked as replacement functionality.
+
+- **Connect Native APIs:** The following APIs for Connect Native are deprecated: 
+  - `v1/agent/connect/authorize` - used by the SDK to perform intention based authorization checks
+  - `v1/agent/connect/ca/leaf` - used by the SDK to get a leaf cert for a locally registered service
+  - `v1/agent/connect/ca/roots` - use to retrieved cached CA roots form the local client agent
+  
+  The `v1/agent/connect/authorize` and `v1/agent/connect/ca/leaf` endpoints have corresponding gRPC APIs. We will remove these APIs when the gRPC API for `v1/agent/connect/ca/roots` and HTTP endpoints for all three APIs are available. 
+
 ## Upgrading
 
 For more detailed information, please refer to the [upgrade details page](/consul/docs/upgrading/upgrade-specific) and the changelogs.
@@ -61,4 +70,4 @@ The changelogs for this major release version and any maintenance versions are l
 
 <Note> These links take you to the changelogs on the GitHub website. </Note>
 
-- [1.16.0](https://github.com/hashicorp/consul/releases/tag/v1.16.0)
+- [1.16.0](https://github.com/hashicorp/consul/releases/tag/v1.16.0)