Merge branch 'main' into crc-fast

Author: vcjana

.changelog/1767741904.md

@@ -1,4 +1,23 @@
 <!-- Do not manually edit this file. Use the `changelogger` tool. -->
+January 14th, 2026
+==================
+**New this release:**
+- (client) Add support for tracking observability business metrics (OBSERVABILITY_TRACING, OBSERVABILITY_OTEL_TRACING, OBSERVABILITY_OTEL_METRICS) in User-Agent headers when telemetry providers are configured.
+- :bug: (client, [smithy-rs#4459](https://github.com/smithy-lang/smithy-rs/issues/4459), @lnj) Updated the `TokenBucket` creation to initialize the bucket with the user-provided `TimeSource` from the `Config`.
+    This fixes the bug in [issue 4459](https://github.com/smithy-lang/smithy-rs/issues/4459) that caused failures
+    in WASM since the TokenBucket was being created with a default `SystemTime` based `TimeSource`
+- :bug: (client, @svix-jbrown) Update the `lru` dependency for `aws-sdk-s3` and `rust-runtime`
+- (client, [smithy-rs#4469](https://github.com/smithy-lang/smithy-rs/issues/4469), @greenwoodcm) Add support for `aws-smithy-mocks` interceptor to handle concurrent requests.
+- :bug: (client, [smithy-rs#4413](https://github.com/smithy-lang/smithy-rs/issues/4413)) Deprecate [NoAuthRuntimePlugin](https://docs.rs/aws-smithy-runtime/1.9.4/aws_smithy_runtime/client/auth/no_auth/struct.NoAuthRuntimePlugin.html), which does not properly configure the auth scheme option resolver for noAuth, and introduce `NoAuthRuntimePluginV2` that does.
+- (client) Update crc-fast to 1.9
+
+**Contributors**
+Thank you for your contributions! ❤
+- @greenwoodcm ([smithy-rs#4469](https://github.com/smithy-lang/smithy-rs/issues/4469))
+- @lnj ([smithy-rs#4459](https://github.com/smithy-lang/smithy-rs/issues/4459))
+- @svix-jbrown
+
+
 December 16th, 2025
 ===================
 **New this release:**

.changelog/1768244447.md

@@ -5,64 +5,6 @@
 {
   "smithy-rs": [],
   "aws-sdk-rust": [
-    {
-      "message": "Update clients to allow `initial-response` events to be accepted on event streams, even when know modeled initial response exists.\n\nThis is required for spec compliance, backwards compatibility, and compatibility with non-smithy-rs based servers that\nMAY unconditionally send `initial-response` messages.\n",
-      "meta": {
-        "bug": true,
-        "breaking": false,
-        "tada": false
-      },
-      "author": "rcoh",
-      "references": [
-        "smithy-rs#4352",
-        "smithy-rs#4353"
-      ],
-      "since-commit": "cf1e783d15842aab12e1ee02ce9d329b8443e848",
-      "age": 5
-    },
-    {
-      "message": "Add tags to `AssumeRoleProviderBuilder`\n",
-      "meta": {
-        "bug": false,
-        "breaking": false,
-        "tada": true
-      },
-      "author": "c-thiel",
-      "references": [
-        "aws-sdk-rust#1366"
-      ],
-      "since-commit": "cf1e783d15842aab12e1ee02ce9d329b8443e848",
-      "age": 5
-    },
-    {
-      "message": "Adds new `with_test_defaults_v2()` for all clients supporting region configuration which applies `us-east-1` as default region if not set by user. This allows `aws-smithy-mocks` to work for non AWS SDK generated clients. Also clarify `test-util` feature requirement when using `aws-smithy-mocks`.\n",
-      "meta": {
-        "bug": true,
-        "breaking": false,
-        "tada": false
-      },
-      "author": "aajtodd",
-      "references": [
-        "smithy-rs#4265",
-        "smithy-rs#4189"
-      ],
-      "since-commit": "cf1e783d15842aab12e1ee02ce9d329b8443e848",
-      "age": 5
-    },
-    {
-      "message": "Upgrade MSRV to Rust 1.88.0.\n",
-      "meta": {
-        "bug": false,
-        "breaking": true,
-        "tada": false
-      },
-      "author": "ysaito1001",
-      "references": [
-        "smithy-rs#4367"
-      ],
-      "since-commit": "cf1e783d15842aab12e1ee02ce9d329b8443e848",
-      "age": 5
-    },
     {
       "message": "Bump crc-fast version to 1.6.0\n",
       "meta": {
@@ -73,7 +15,7 @@
       "author": "landonxjames",
       "references": [],
       "since-commit": "4533810c833251e78df3d8a4992b8ccc5f2fc67c",
-      "age": 4
+      "age": 5
     },
     {
       "message": "Validate `Region` is a valid host label when constructing endpoints.\n",
@@ -85,7 +27,7 @@
       "author": "aajtodd",
       "references": [],
       "since-commit": "4533810c833251e78df3d8a4992b8ccc5f2fc67c",
-      "age": 4
+      "age": 5
     },
     {
       "message": "Fix Content-Type and Accept headers for event streams in RPC v2 CBOR to set `application/vnd.amazon.eventstream`\n",
@@ -99,7 +41,7 @@
         "smithy-rs#4427"
       ],
       "since-commit": "8a939c7b0de5ddd921132e7d558851f7957c18a8",
-      "age": 2
+      "age": 3
     },
     {
       "message": "In `legacy-rustls-ring`, polyfill `with_native_roots` to use `rustls_native_certs 0.8` to avoid\nRUSTSEC-2025-0134.",
@@ -113,7 +55,7 @@
         "aws-sdk-rust#1390"
       ],
       "since-commit": "8a939c7b0de5ddd921132e7d558851f7957c18a8",
-      "age": 2
+      "age": 3
     },
     {
       "message": "Publish an MSRV for all packages\n\n",
@@ -125,7 +67,7 @@
       "author": "arielby",
       "references": [],
       "since-commit": "8a939c7b0de5ddd921132e7d558851f7957c18a8",
-      "age": 2
+      "age": 3
     },
     {
       "message": "Add `expect_number_as_string_or_null` function to `aws-smithy-json` that extracts JSON numbers as strings without converting to u64/i64/f64. This preserves arbitrary precision for BigInteger and BigDecimal support, preventing precision loss for numbers larger than standard numeric types can represent.\n",
@@ -139,6 +81,30 @@
         "smithy-rs#4418"
       ],
       "since-commit": "26c59c21b638bbd33a9f46060ff8cc8d4c9df67c",
+      "age": 2
+    },
+    {
+      "message": "Update the `lru` dependency for `aws-sdk-s3` and `rust-runtime`\n",
+      "meta": {
+        "bug": true,
+        "breaking": false,
+        "tada": false
+      },
+      "author": "svix-jbrown",
+      "references": [],
+      "since-commit": "543c1879256ddb033d5c73a10e98611328cbc37c",
+      "age": 1
+    },
+    {
+      "message": "Update crc-fast to 1.9\n",
+      "meta": {
+        "bug": false,
+        "breaking": false,
+        "tada": false
+      },
+      "author": "aajtodd",
+      "references": [],
+      "since-commit": "543c1879256ddb033d5c73a10e98611328cbc37c",
       "age": 1
     }
   ],

.changelog/bump-lru.md

@@ -60,6 +60,7 @@ class AwsFluentClientDecorator : ClientCodegenDecorator {
                     AwsPresignedFluentBuilderMethod(codegenContext),
                     AwsFluentClientDocs(codegenContext),
                     AwsFluentClientRetryPartition(codegenContext),
+                    AwsFluentClientEnableRetries(codegenContext),
                 ).letIf(codegenContext.serviceShape.id == ShapeId.from("com.amazonaws.s3#AmazonS3")) {
                     it + S3ExpressFluentClientCustomization(codegenContext)
                 },
@@ -199,3 +200,25 @@ private class AwsFluentClientRetryPartition(private val codegenContext: ClientCo
         }
     }
 }
+
+/**
+ * Enables retries by default for AWS SDK clients when awsSdkBuild is true.
+ *
+ * Only applies to real AWS SDK builds (controlled by awsSdkBuild in JSON settings).
+ */
+private class AwsFluentClientEnableRetries(private val codegenContext: ClientCodegenContext) : FluentClientCustomization() {
+    override fun section(section: FluentClientSection): Writable {
+        if (!codegenContext.sdkSettings().awsSdkBuild) {
+            return emptySection
+        }
+
+        return when (section) {
+            is FluentClientSection.CustomizeDefaultPluginParams -> {
+                writable {
+                    rust(".with_is_aws_sdk(true)")
+                }
+            }
+            else -> emptySection
+        }
+    }
+}

.changelog/observability-metrics.md

@@ -456,6 +456,7 @@ internal class HttpChecksumTest {
                         .region(Region::from_static("doesntmatter"))
                         .with_test_defaults()
                         .http_client(http_client)
+                        .retry_config(#{RetryConfig}::disabled())
                         .build();
 
                     let client = $moduleName::Client::from_conf(config);
@@ -489,6 +490,7 @@ internal class HttpChecksumTest {
                 "tokio" to CargoDependency.Tokio.toType(),
                 "capture_request" to RuntimeType.captureRequest(rc),
                 "http_1x" to CargoDependency.Http1x.toType(),
+                "RetryConfig" to RuntimeType.smithyTypes(rc).resolve("retry::RetryConfig"),
             )
         }
     }

.changelog/token_bucket_time_source.md

@@ -65,6 +65,7 @@ class TimeoutConfigMergingTest {
                         let operation = Duration::from_secs(4);
                         let http_client = infallible_client_fn(|_req| http::Response::builder().body(SdkBody::empty()).unwrap());
                         let sdk_config = SdkConfig::builder()
+                            .behavior_version(aws_smithy_runtime_api::client::behavior_version::BehaviorVersion::v2026_01_12())
                             .timeout_config(
                                 TimeoutConfig::builder()
                                     .connect_timeout(connect_timeout)
@@ -157,8 +158,6 @@ class TimeoutConfigMergingTest {
                             &TimeoutConfig::builder()
                                 .read_timeout(Duration::from_secs(10))
                                 .connect_timeout(connect_timeout)
-                                .disable_operation_attempt_timeout()
-                                .disable_operation_timeout()
                                 .build(),
                             "read timeout overridden"
                         );