diff --git a/api_names_out.yaml b/api_names_out.yaml
index 1cf9e556d16..3942488e18a 100644
--- a/api_names_out.yaml
+++ b/api_names_out.yaml
@@ -6978,6 +6978,7 @@
 "/analyticsdata:v1alpha/DimensionHeader/name": name
 "/analyticsdata:v1alpha/DimensionMetadata": dimension_metadata
 "/analyticsdata:v1alpha/DimensionMetadata/apiName": api_name
+"/analyticsdata:v1alpha/DimensionMetadata/customDefinition": custom_definition
 "/analyticsdata:v1alpha/DimensionMetadata/deprecatedApiNames": deprecated_api_names
 "/analyticsdata:v1alpha/DimensionMetadata/deprecatedApiNames/deprecated_api_name": deprecated_api_name
 "/analyticsdata:v1alpha/DimensionMetadata/description": description
@@ -7023,6 +7024,7 @@
 "/analyticsdata:v1alpha/MetricHeader/type": type
 "/analyticsdata:v1alpha/MetricMetadata": metric_metadata
 "/analyticsdata:v1alpha/MetricMetadata/apiName": api_name
+"/analyticsdata:v1alpha/MetricMetadata/customDefinition": custom_definition
 "/analyticsdata:v1alpha/MetricMetadata/deprecatedApiNames": deprecated_api_names
 "/analyticsdata:v1alpha/MetricMetadata/deprecatedApiNames/deprecated_api_name": deprecated_api_name
 "/analyticsdata:v1alpha/MetricMetadata/description": description
diff --git a/generated/google/apis/analyticsdata_v1alpha.rb b/generated/google/apis/analyticsdata_v1alpha.rb
index 88b6dc672d9..089fdb2bbcc 100644
--- a/generated/google/apis/analyticsdata_v1alpha.rb
+++ b/generated/google/apis/analyticsdata_v1alpha.rb
@@ -25,7 +25,7 @@ module Apis
     # @see https://developers.google.com/analytics/trusted-testing/analytics-data/
     module AnalyticsdataV1alpha
       VERSION = 'V1alpha'
-      REVISION = '20201110'
+      REVISION = '20201112'
 
       # View and manage your Google Analytics data
       AUTH_ANALYTICS = 'https://www.googleapis.com/auth/analytics'
diff --git a/generated/google/apis/analyticsdata_v1alpha/classes.rb b/generated/google/apis/analyticsdata_v1alpha/classes.rb
index b156b747169..eb53d831a15 100644
--- a/generated/google/apis/analyticsdata_v1alpha/classes.rb
+++ b/generated/google/apis/analyticsdata_v1alpha/classes.rb
@@ -452,6 +452,12 @@ class DimensionMetadata
         # @return [String]
         attr_accessor :api_name
       
+        # True if the dimension is a custom dimension for this property.
+        # Corresponds to the JSON property `customDefinition`
+        # @return [Boolean]
+        attr_accessor :custom_definition
+        alias_method :custom_definition?, :custom_definition
+      
         # Still usable but deprecated names for this dimension. If populated, this
         # dimension is available by either `apiName` or one of `deprecatedApiNames` for
         # a period of time. After the deprecation period, the dimension will be
@@ -478,6 +484,7 @@ def initialize(**args)
         # Update properties of this object
         def update!(**args)
           @api_name = args[:api_name] if args.key?(:api_name)
+          @custom_definition = args[:custom_definition] if args.key?(:custom_definition)
           @deprecated_api_names = args[:deprecated_api_names] if args.key?(:deprecated_api_names)
           @description = args[:description] if args.key?(:description)
           @ui_name = args[:ui_name] if args.key?(:ui_name)
@@ -797,6 +804,12 @@ class MetricMetadata
         # @return [String]
         attr_accessor :api_name
       
+        # True if the metric is a custom metric for this property.
+        # Corresponds to the JSON property `customDefinition`
+        # @return [Boolean]
+        attr_accessor :custom_definition
+        alias_method :custom_definition?, :custom_definition
+      
         # Still usable but deprecated names for this metric. If populated, this metric
         # is available by either `apiName` or one of `deprecatedApiNames` for a period
         # of time. After the deprecation period, the metric will be available only by `
@@ -835,6 +848,7 @@ def initialize(**args)
         # Update properties of this object
         def update!(**args)
           @api_name = args[:api_name] if args.key?(:api_name)
+          @custom_definition = args[:custom_definition] if args.key?(:custom_definition)
           @deprecated_api_names = args[:deprecated_api_names] if args.key?(:deprecated_api_names)
           @description = args[:description] if args.key?(:description)
           @expression = args[:expression] if args.key?(:expression)
diff --git a/generated/google/apis/analyticsdata_v1alpha/representations.rb b/generated/google/apis/analyticsdata_v1alpha/representations.rb
index e5e900bd2e7..59b964eba08 100644
--- a/generated/google/apis/analyticsdata_v1alpha/representations.rb
+++ b/generated/google/apis/analyticsdata_v1alpha/representations.rb
@@ -450,6 +450,7 @@ class DimensionMetadata
         # @private
         class Representation < Google::Apis::Core::JsonRepresentation
           property :api_name, as: 'apiName'
+          property :custom_definition, as: 'customDefinition'
           collection :deprecated_api_names, as: 'deprecatedApiNames'
           property :description, as: 'description'
           property :ui_name, as: 'uiName'
@@ -556,6 +557,7 @@ class MetricMetadata
         # @private
         class Representation < Google::Apis::Core::JsonRepresentation
           property :api_name, as: 'apiName'
+          property :custom_definition, as: 'customDefinition'
           collection :deprecated_api_names, as: 'deprecatedApiNames'
           property :description, as: 'description'
           property :expression, as: 'expression'
diff --git a/generated/google/apis/analyticsdata_v1alpha/synth.metadata b/generated/google/apis/analyticsdata_v1alpha/synth.metadata
index 52f71e42b0a..b752d1642a5 100644
--- a/generated/google/apis/analyticsdata_v1alpha/synth.metadata
+++ b/generated/google/apis/analyticsdata_v1alpha/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-api-ruby-client.git",
-        "sha": "f98e8cc384534befb2581970289d37af2f501cc2"
+        "sha": "5a5fc28c514f8c35b017cae0c2a86d8c0dceb8dd"
       }
     }
   ]