diff --git a/api_names_out.yaml b/api_names_out.yaml
index bdb5da321..fc2a49435 100644
--- a/api_names_out.yaml
+++ b/api_names_out.yaml
@@ -12389,6 +12389,7 @@
 "/appengine:v1/Instance/vmDebugEnabled": vm_debug_enabled
 "/appengine:v1/Instance/vmId": vm_id
 "/appengine:v1/Instance/vmIp": vm_ip
+"/appengine:v1/Instance/vmLiveness": vm_liveness
 "/appengine:v1/Instance/vmName": vm_name
 "/appengine:v1/Instance/vmStatus": vm_status
 "/appengine:v1/Instance/vmZoneName": vm_zone_name
diff --git a/generated/google/apis/appengine_v1.rb b/generated/google/apis/appengine_v1.rb
index b2607e5ba..268baa7dd 100644
--- a/generated/google/apis/appengine_v1.rb
+++ b/generated/google/apis/appengine_v1.rb
@@ -25,7 +25,7 @@ module Google
     # @see https://cloud.google.com/appengine/docs/admin-api/
     module AppengineV1
       VERSION = 'V1'
-      REVISION = '20200914'
+      REVISION = '20201201'
 
       # View and manage your applications deployed on Google App Engine
       AUTH_APPENGINE_ADMIN = 'https://www.googleapis.com/auth/appengine.admin'
diff --git a/generated/google/apis/appengine_v1/classes.rb b/generated/google/apis/appengine_v1/classes.rb
index e95697bdd..fcc0b918f 100644
--- a/generated/google/apis/appengine_v1/classes.rb
+++ b/generated/google/apis/appengine_v1/classes.rb
@@ -1211,6 +1211,12 @@ module Google
         # @return [String]
         attr_accessor :vm_ip
       
+        # Output only. The liveness health check of this instance. Only applicable for
+        # instances in App Engine flexible environment.
+        # Corresponds to the JSON property `vmLiveness`
+        # @return [String]
+        attr_accessor :vm_liveness
+      
         # Output only. Name of the virtual machine where this instance lives. Only
         # applicable for instances in App Engine flexible environment.
         # Corresponds to the JSON property `vmName`
@@ -1248,6 +1254,7 @@ module Google
           @vm_debug_enabled = args[:vm_debug_enabled] if args.key?(:vm_debug_enabled)
           @vm_id = args[:vm_id] if args.key?(:vm_id)
           @vm_ip = args[:vm_ip] if args.key?(:vm_ip)
+          @vm_liveness = args[:vm_liveness] if args.key?(:vm_liveness)
           @vm_name = args[:vm_name] if args.key?(:vm_name)
           @vm_status = args[:vm_status] if args.key?(:vm_status)
           @vm_zone_name = args[:vm_zone_name] if args.key?(:vm_zone_name)
diff --git a/generated/google/apis/appengine_v1/representations.rb b/generated/google/apis/appengine_v1/representations.rb
index c0be9aa82..79833cbc6 100644
--- a/generated/google/apis/appengine_v1/representations.rb
+++ b/generated/google/apis/appengine_v1/representations.rb
@@ -749,6 +749,7 @@ module Google
           property :vm_debug_enabled, as: 'vmDebugEnabled'
           property :vm_id, as: 'vmId'
           property :vm_ip, as: 'vmIp'
+          property :vm_liveness, as: 'vmLiveness'
           property :vm_name, as: 'vmName'
           property :vm_status, as: 'vmStatus'
           property :vm_zone_name, as: 'vmZoneName'
diff --git a/generated/google/apis/appengine_v1/synth.metadata b/generated/google/apis/appengine_v1/synth.metadata
index 429012f74..dce2edbf2 100644
--- a/generated/google/apis/appengine_v1/synth.metadata
+++ b/generated/google/apis/appengine_v1/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-api-ruby-client.git",
-        "sha": "c98c719bbab68d0890524d53f8b629d7858af9c2"
+        "sha": "4c3b5036c3f285694392acbf3ad0311a73c9800c"
       }
     }
   ]