diff --git a/.changelog/183ea75365084891a3fe4986467171dc.json b/.changelog/183ea75365084891a3fe4986467171dc.json
new file mode 100644
index 00000000000..cc2919be43c
--- /dev/null
+++ b/.changelog/183ea75365084891a3fe4986467171dc.json
@@ -0,0 +1,8 @@
+{
+    "id": "183ea753-6508-4891-a3fe-4986467171dc",
+    "type": "documentation",
+    "description": "Clarify possible values for KmsKeyArn and EncryptionDescription.",
+    "modules": [
+        "service/qldb"
+    ]
+}
\ No newline at end of file
diff --git a/.changelog/4cba1be480ec49fd9580b3644b2ae99f.json b/.changelog/4cba1be480ec49fd9580b3644b2ae99f.json
new file mode 100644
index 00000000000..57a52bfa59a
--- /dev/null
+++ b/.changelog/4cba1be480ec49fd9580b3644b2ae99f.json
@@ -0,0 +1,8 @@
+{
+    "id": "4cba1be4-80ec-49fd-9580-b3644b2ae99f",
+    "type": "documentation",
+    "description": "Doc-only update for new RUM metrics that were added",
+    "modules": [
+        "service/rum"
+    ]
+}
\ No newline at end of file
diff --git a/.changelog/4e202444408845fb8cb9bd86cf0b2201.json b/.changelog/4e202444408845fb8cb9bd86cf0b2201.json
new file mode 100644
index 00000000000..e448a0972ae
--- /dev/null
+++ b/.changelog/4e202444408845fb8cb9bd86cf0b2201.json
@@ -0,0 +1,8 @@
+{
+    "id": "4e202444-4088-45fb-8cb9-bd86cf0b2201",
+    "type": "feature",
+    "description": "Add pattern and length based validations for DBShardGroupIdentifier",
+    "modules": [
+        "service/rds"
+    ]
+}
\ No newline at end of file
diff --git a/.changelog/8c868ec514a841578cff1a3129bd9726.json b/.changelog/8c868ec514a841578cff1a3129bd9726.json
new file mode 100644
index 00000000000..97be2e44555
--- /dev/null
+++ b/.changelog/8c868ec514a841578cff1a3129bd9726.json
@@ -0,0 +1,8 @@
+{
+    "id": "8c868ec5-14a8-4157-8cff-1a3129bd9726",
+    "type": "documentation",
+    "description": "Documentation only updates for AppSync",
+    "modules": [
+        "service/appsync"
+    ]
+}
\ No newline at end of file
diff --git a/service/appsync/api_op_CreateApiCache.go b/service/appsync/api_op_CreateApiCache.go
index 5d555e1ada1..b1216ef02f2 100644
--- a/service/appsync/api_op_CreateApiCache.go
+++ b/service/appsync/api_op_CreateApiCache.go
@@ -76,10 +76,12 @@ type CreateApiCacheInput struct {
 
 	// Controls how cache health metrics will be emitted to CloudWatch. Cache health
 	// metrics include:
-	//   - NetworkBandwidthOutAllowanceExceeded: The number of times a specified
-	//   GraphQL operation was called.
-	//   - EngineCPUUtilization: The number of GraphQL errors that occurred during a
-	//   specified GraphQL operation.
+	//   - NetworkBandwidthOutAllowanceExceeded: The network packets dropped because
+	//   the throughput exceeded the aggregated bandwidth limit. This is useful for
+	//   diagnosing bottlenecks in a cache configuration.
+	//   - EngineCPUUtilization: The CPU utilization (percentage) allocated to the
+	//   Redis process. This is useful for diagnosing bottlenecks in a cache
+	//   configuration.
 	// Metrics will be recorded by API ID. You can set the value to ENABLED or DISABLED
 	// .
 	HealthMetricsConfig types.CacheHealthMetricsConfig
diff --git a/service/appsync/api_op_UpdateApiCache.go b/service/appsync/api_op_UpdateApiCache.go
index 5de57e44734..dc4d1b82aa9 100644
--- a/service/appsync/api_op_UpdateApiCache.go
+++ b/service/appsync/api_op_UpdateApiCache.go
@@ -72,10 +72,12 @@ type UpdateApiCacheInput struct {
 
 	// Controls how cache health metrics will be emitted to CloudWatch. Cache health
 	// metrics include:
-	//   - NetworkBandwidthOutAllowanceExceeded: The number of times a specified
-	//   GraphQL operation was called.
-	//   - EngineCPUUtilization: The number of GraphQL errors that occurred during a
-	//   specified GraphQL operation.
+	//   - NetworkBandwidthOutAllowanceExceeded: The network packets dropped because
+	//   the throughput exceeded the aggregated bandwidth limit. This is useful for
+	//   diagnosing bottlenecks in a cache configuration.
+	//   - EngineCPUUtilization: The CPU utilization (percentage) allocated to the
+	//   Redis process. This is useful for diagnosing bottlenecks in a cache
+	//   configuration.
 	// Metrics will be recorded by API ID. You can set the value to ENABLED or DISABLED
 	// .
 	HealthMetricsConfig types.CacheHealthMetricsConfig
diff --git a/service/appsync/types/types.go b/service/appsync/types/types.go
index f9d44a67d83..4679a8653c7 100644
--- a/service/appsync/types/types.go
+++ b/service/appsync/types/types.go
@@ -551,7 +551,7 @@ type ElasticsearchDataSourceConfig struct {
 //   - FULL_REQUEST_RESOLVER_METRICS : Records and emits metric data for all
 //     resolvers in the request.
 //   - PER_RESOLVER_METRICS : Records and emits metric data for resolvers that have
-//     the metricConfig value set to ENABLED .
+//     the metricsConfig value set to ENABLED .
 //   - dataSourceLevelMetricsBehavior : Controls how data source metrics will be
 //     emitted to CloudWatch. Data source metrics include:
 //   - Requests: The number of invocations that occured during a request.
@@ -563,7 +563,7 @@ type ElasticsearchDataSourceConfig struct {
 //   - FULL_REQUEST_DATA_SOURCE_METRICS : Records and emits metric data for all
 //     data sources in the request.
 //   - PER_DATA_SOURCE_METRICS : Records and emits metric data for data sources
-//     that have the metricConfig value set to ENABLED .
+//     that have the metricsConfig value set to ENABLED .
 //   - operationLevelMetricsConfig : Controls how operation metrics will be emitted
 //     to CloudWatch. Operation metrics include:
 //   - Requests: The number of times a specified GraphQL operation was called.
@@ -583,7 +583,7 @@ type EnhancedMetricsConfig struct {
 	//   - FULL_REQUEST_DATA_SOURCE_METRICS : Records and emits metric data for all
 	//   data sources in the request.
 	//   - PER_DATA_SOURCE_METRICS : Records and emits metric data for data sources
-	//   that have the metricConfig value set to ENABLED .
+	//   that have the metricsConfig value set to ENABLED .
 	//
 	// This member is required.
 	DataSourceLevelMetricsBehavior DataSourceLevelMetricsBehavior
@@ -612,7 +612,7 @@ type EnhancedMetricsConfig struct {
 	//   - FULL_REQUEST_RESOLVER_METRICS : Records and emits metric data for all
 	//   resolvers in the request.
 	//   - PER_RESOLVER_METRICS : Records and emits metric data for resolvers that have
-	//   the metricConfig value set to ENABLED .
+	//   the metricsConfig value set to ENABLED .
 	//
 	// This member is required.
 	ResolverLevelMetricsBehavior ResolverLevelMetricsBehavior
diff --git a/service/qldb/api_op_DescribeLedger.go b/service/qldb/api_op_DescribeLedger.go
index 88350ec03cb..3a2e6c70e06 100644
--- a/service/qldb/api_op_DescribeLedger.go
+++ b/service/qldb/api_op_DescribeLedger.go
@@ -58,7 +58,8 @@ type DescribeLedgerOutput struct {
 
 	// Information about the encryption of data at rest in the ledger. This includes
 	// the current status, the KMS key, and when the key became inaccessible (in the
-	// case of an error).
+	// case of an error). If this parameter is undefined, the ledger uses an Amazon Web
+	// Services owned KMS key for encryption.
 	EncryptionDescription *types.LedgerEncryptionDescription
 
 	// The name of the ledger.
diff --git a/service/qldb/endpoints.go b/service/qldb/endpoints.go
index 3a66bc77c12..cddba737a7c 100644
--- a/service/qldb/endpoints.go
+++ b/service/qldb/endpoints.go
@@ -373,7 +373,7 @@ func (r *resolver) ResolveEndpoint(
 				}
 			}
 			if _UseFIPS == true {
-				if true == _PartitionResult.SupportsFIPS {
+				if _PartitionResult.SupportsFIPS == true {
 					uriString := func() string {
 						var out strings.Builder
 						out.WriteString("https://qldb-fips.")
diff --git a/service/qldb/types/types.go b/service/qldb/types/types.go
index 5deda41c4a3..18f23476c35 100644
--- a/service/qldb/types/types.go
+++ b/service/qldb/types/types.go
@@ -177,7 +177,9 @@ type LedgerEncryptionDescription struct {
 
 	// The Amazon Resource Name (ARN) of the customer managed KMS key that the ledger
 	// uses for encryption at rest. If this parameter is undefined, the ledger uses an
-	// Amazon Web Services owned KMS key for encryption.
+	// Amazon Web Services owned KMS key for encryption. It will display
+	// AWS_OWNED_KMS_KEY when updating the ledger's encryption configuration to the
+	// Amazon Web Services owned KMS key.
 	//
 	// This member is required.
 	KmsKeyArn *string
diff --git a/service/rum/api_op_BatchCreateRumMetricDefinitions.go b/service/rum/api_op_BatchCreateRumMetricDefinitions.go
index ae6f7360d01..f4f362f20c2 100644
--- a/service/rum/api_op_BatchCreateRumMetricDefinitions.go
+++ b/service/rum/api_op_BatchCreateRumMetricDefinitions.go
@@ -16,24 +16,24 @@ import (
 // and Evidently. By default, RUM app monitors send some metrics to CloudWatch.
 // These default metrics are listed in CloudWatch metrics that you can collect
 // with CloudWatch RUM (https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-RUM-metrics.html)
-// . In addition to these default metrics, you can choose to send extended metrics
-// or custom metrics or both.
-//   - Extended metrics enable you to send metrics with additional dimensions not
-//     included in the default metrics. You can also send extended metrics to Evidently
-//     as well as CloudWatch. The valid dimension names for the additional dimensions
-//     for extended metrics are BrowserName , CountryCode , DeviceType , FileType ,
-//     OSName , and PageId . For more information, see Extended metrics that you can
-//     send to CloudWatch and CloudWatch Evidently (https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-RUM-vended-metrics.html)
+// . In addition to these default metrics, you can choose to send extended metrics,
+// custom metrics, or both.
+//   - Extended metrics let you send metrics with additional dimensions that
+//     aren't included in the default metrics. You can also send extended metrics to
+//     both Evidently and CloudWatch. The valid dimension names for the additional
+//     dimensions for extended metrics are BrowserName , CountryCode , DeviceType ,
+//     FileType , OSName , and PageId . For more information, see Extended metrics
+//     that you can send to CloudWatch and CloudWatch Evidently (https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-RUM-vended-metrics.html)
 //     .
 //   - Custom metrics are metrics that you define. You can send custom metrics to
-//     CloudWatch or to CloudWatch Evidently or to both. With custom metrics, you can
-//     use any metric name and namespace, and to derive the metrics you can use any
-//     custom events, built-in events, custom attributes, or default attributes. You
-//     can't send custom metrics to the AWS/RUM namespace. You must send custom
-//     metrics to a custom namespace that you define. The namespace that you use can't
-//     start with AWS/ . CloudWatch RUM prepends RUM/CustomMetrics/ to the custom
-//     namespace that you define, so the final namespace for your metrics in CloudWatch
-//     is RUM/CustomMetrics/your-custom-namespace .
+//     CloudWatch. CloudWatch Evidently, or both. With custom metrics, you can use any
+//     metric name and namespace. To derive the metrics, you can use any custom events,
+//     built-in events, custom attributes, or default attributes. You can't send custom
+//     metrics to the AWS/RUM namespace. You must send custom metrics to a custom
+//     namespace that you define. The namespace that you use can't start with AWS/ .
+//     CloudWatch RUM prepends RUM/CustomMetrics/ to the custom namespace that you
+//     define, so the final namespace for your metrics in CloudWatch is
+//     RUM/CustomMetrics/your-custom-namespace .
 //
 // The maximum number of metric definitions that you can specify in one
 // BatchCreateRumMetricDefinitions operation is 200. The maximum number of metric
@@ -69,9 +69,9 @@ type BatchCreateRumMetricDefinitionsInput struct {
 	AppMonitorName *string
 
 	// The destination to send the metrics to. Valid values are CloudWatch and
-	// Evidently . If you specify Evidently , you must also specify the ARN of the
-	// CloudWatchEvidently experiment that will receive the metrics and an IAM role
-	// that has permission to write to the experiment.
+	// Evidently . If you specify Evidently , you must also specify the Amazon Resource
+	// Name (ARN) of the CloudWatchEvidently experiment that will receive the metrics
+	// and an IAM role that has permission to write to the experiment.
 	//
 	// This member is required.
 	Destination types.MetricDestination
diff --git a/service/rum/api_op_CreateAppMonitor.go b/service/rum/api_op_CreateAppMonitor.go
index 402820866aa..290a1c60ecc 100644
--- a/service/rum/api_op_CreateAppMonitor.go
+++ b/service/rum/api_op_CreateAppMonitor.go
@@ -53,7 +53,7 @@ type CreateAppMonitorInput struct {
 	// identity pool to use for authorization. If you don't include
 	// AppMonitorConfiguration , you must set up your own authorization method. For
 	// more information, see Authorize your application to send data to Amazon Web
-	// Services (https://docs.aws.amazon.com/monitoring/CloudWatch-RUM-get-started-authorization.html)
+	// Services (https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-RUM-get-started-authorization.html)
 	// . If you omit this argument, the sample rate used for RUM is set to 10% of the
 	// user sessions.
 	AppMonitorConfiguration *types.AppMonitorConfiguration
diff --git a/service/rum/api_op_PutRumMetricsDestination.go b/service/rum/api_op_PutRumMetricsDestination.go
index a9552ecf40d..5f8d3d846c3 100644
--- a/service/rum/api_op_PutRumMetricsDestination.go
+++ b/service/rum/api_op_PutRumMetricsDestination.go
@@ -51,9 +51,13 @@ type PutRumMetricsDestinationInput struct {
 	DestinationArn *string
 
 	// This parameter is required if Destination is Evidently . If Destination is
-	// CloudWatch , do not use this parameter. This parameter specifies the ARN of an
+	// CloudWatch , don't use this parameter. This parameter specifies the ARN of an
 	// IAM role that RUM will assume to write to the Evidently experiment that you are
 	// sending metrics to. This role must have permission to write to that experiment.
+	// If you specify this parameter, you must be signed on to a role that has PassRole (https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use_passrole.html)
+	// permissions attached to it, to allow the role to be passed. The
+	// CloudWatchAmazonCloudWatchRUMFullAccess (https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/auth-and-access-control-cw.html#managed-policies-cloudwatch-RUM)
+	// policy doesn't include PassRole permissions.
 	IamRoleArn *string
 
 	noSmithyDocumentSerde
diff --git a/service/rum/api_op_UpdateAppMonitor.go b/service/rum/api_op_UpdateAppMonitor.go
index 468482f0c9d..b0f5a1efba0 100644
--- a/service/rum/api_op_UpdateAppMonitor.go
+++ b/service/rum/api_op_UpdateAppMonitor.go
@@ -48,7 +48,7 @@ type UpdateAppMonitorInput struct {
 	// identity pool to use for authorization. If you don't include
 	// AppMonitorConfiguration , you must set up your own authorization method. For
 	// more information, see Authorize your application to send data to Amazon Web
-	// Services (https://docs.aws.amazon.com/monitoring/CloudWatch-RUM-get-started-authorization.html)
+	// Services (https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-RUM-get-started-authorization.html)
 	// .
 	AppMonitorConfiguration *types.AppMonitorConfiguration
 
diff --git a/service/rum/endpoints.go b/service/rum/endpoints.go
index ca86aa15094..9cce9772bbe 100644
--- a/service/rum/endpoints.go
+++ b/service/rum/endpoints.go
@@ -373,7 +373,7 @@ func (r *resolver) ResolveEndpoint(
 				}
 			}
 			if _UseFIPS == true {
-				if true == _PartitionResult.SupportsFIPS {
+				if _PartitionResult.SupportsFIPS == true {
 					uriString := func() string {
 						var out strings.Builder
 						out.WriteString("https://rum-fips.")
diff --git a/service/rum/types/types.go b/service/rum/types/types.go
index 4e648d4e18a..a2297f15e89 100644
--- a/service/rum/types/types.go
+++ b/service/rum/types/types.go
@@ -77,7 +77,17 @@ type AppMonitorConfiguration struct {
 	FavoritePages []string
 
 	// The ARN of the guest IAM role that is attached to the Amazon Cognito identity
-	// pool that is used to authorize the sending of data to RUM.
+	// pool that is used to authorize the sending of data to RUM. It is possible that
+	// an app monitor does not have a value for GuestRoleArn . For example, this can
+	// happen when you use the console to create an app monitor and you allow
+	// CloudWatch RUM to create a new identity pool for Authorization. In this case,
+	// GuestRoleArn is not present in the GetAppMonitor (https://docs.aws.amazon.com/cloudwatchrum/latest/APIReference/API_GetAppMonitor.html)
+	// response because it is not stored by the service. If this issue affects you, you
+	// can take one of the following steps:
+	//   - Use the Cloud Development Kit (CDK) to create an identity pool and the
+	//   associated IAM role, and use that for your app monitor.
+	//   - Make a separate GetIdentityPoolRoles (https://docs.aws.amazon.com/cognitoidentity/latest/APIReference/API_GetIdentityPoolRoles.html)
+	//   call to Amazon Cognito to retrieve the GuestRoleArn .
 	GuestRoleArn *string
 
 	// The ID of the Amazon Cognito identity pool that is used to authorize the
@@ -273,14 +283,15 @@ type MetricDefinition struct {
 }
 
 // Use this structure to define one extended metric or custom metric that RUM will
-// send to CloudWatch or CloudWatch Evidently. For more information, see
-// Additional metrics that you can send to CloudWatch and CloudWatch Evidently (https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-RUM-vended-metrics.html)
+// send to CloudWatch or CloudWatch Evidently. For more information, see Custom
+// metrics and extended metrics that you can send to CloudWatch and CloudWatch
+// Evidently (https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-RUM-custom-and-extended-metrics.html)
 // . This structure is validated differently for extended metrics and custom
 // metrics. For extended metrics that are sent to the AWS/RUM namespace, the
 // following validations apply:
 //   - The Namespace parameter must be omitted or set to AWS/RUM .
 //   - Only certain combinations of values for Name , ValueKey , and EventPattern
-//     are valid. In addition to what is displayed in the list below, the
+//     are valid. In addition to what is displayed in the following list, the
 //     EventPattern can also include information used by the DimensionKeys field.
 //   - If Name is PerformanceNavigationDuration , then ValueKey must be
 //     event_details.duration and the EventPattern must include
@@ -315,6 +326,16 @@ type MetricDefinition struct {
 //     must include {"event_type":["com.amazon.rum.http_event"]}
 //   - If Name is SessionCount , then ValueKey must be null and the EventPattern
 //     must include {"event_type":["com.amazon.rum.session_start_event"]}
+//   - If Name is PageViewCount , then ValueKey must be null and the EventPattern
+//     must include {"event_type":["com.amazon.rum.page_view_event"]}
+//   - If Name is Http4xxCount , then ValueKey must be null and the EventPattern
+//     must include {"event_type":
+//     ["com.amazon.rum.http_event"],"event_details":{"response":{"status":[{"numeric":[">=",400,"<",500]}]}}}
+//     }
+//   - If Name is Http5xxCount , then ValueKey must be null and the EventPattern
+//     must include {"event_type":
+//     ["com.amazon.rum.http_event"],"event_details":{"response":{"status":[{"numeric":[">=",500,"<=",599]}]}}}
+//     }
 //
 // For custom metrics, the following validation rules apply:
 //   - The namespace can't be omitted and can't be AWS/RUM . You can use the
@@ -398,7 +419,7 @@ type MetricDefinitionRequest struct {
 	//   - '{ "event_type": ["com.amazon.rum.performance_navigation_event"],
 	//   "metadata": { "browserName": [ "Chrome", "Safari" ], "countryCode": [ "US" ] },
 	//   "event_details": { "duration": [{ "numeric": [ ">=", 2000, "<", 8000 ] }] } }'
-	// If the metrics destination' is CloudWatch and the event also matches a value in
+	// If the metrics destination is CloudWatch and the event also matches a value in
 	// DimensionKeys , then the metric is published with the specified dimensions.
 	EventPattern *string
 
@@ -414,9 +435,9 @@ type MetricDefinitionRequest struct {
 
 	// The field within the event object that the metric value is sourced from. If you
 	// omit this field, a hardcoded value of 1 is pushed as the metric value. This is
-	// useful if you just want to count the number of events that the filter catches.
-	// If this metric is sent to CloudWatch Evidently, this field will be passed to
-	// Evidently raw and Evidently will handle data extraction from the event.
+	// useful if you want to count the number of events that the filter catches. If
+	// this metric is sent to CloudWatch Evidently, this field will be passed to
+	// Evidently raw. Evidently will handle data extraction from the event.
 	ValueKey *string
 
 	noSmithyDocumentSerde