chore: Update discovery artifacts (#1618)

## Deleted keys were detected in the following stable discovery artifacts:
compute v1 https://github.com/googleapis/google-api-python-client/commit/834349f1c54a0be33fb55e3328f88f25fa6a9419

## Deleted keys were detected in the following pre-stable discovery artifacts:
compute alpha https://github.com/googleapis/google-api-python-client/commit/834349f1c54a0be33fb55e3328f88f25fa6a9419
compute beta https://github.com/googleapis/google-api-python-client/commit/834349f1c54a0be33fb55e3328f88f25fa6a9419

## Discovery Artifact Change Summary:
feat(analyticsadmin): update the api https://github.com/googleapis/google-api-python-client/commit/835ba4092c656966ec26ec08f6be20d5d1abcf43
feat(bigquery): update the api https://github.com/googleapis/google-api-python-client/commit/6abccd47e1e537bbc46447acf1495a610c3dae31
feat(chat): update the api https://github.com/googleapis/google-api-python-client/commit/f5a2e18eebb360f0b416765166303d362944130f
feat(cloudasset): update the api https://github.com/googleapis/google-api-python-client/commit/d3602dbfbb01eda58b5930bf17f8fbdfaad1e6cf
feat(cloudkms): update the api https://github.com/googleapis/google-api-python-client/commit/a3343e30f99a8250ac4dffc401e3106b21e59c13
feat(composer): update the api https://github.com/googleapis/google-api-python-client/commit/614167472dc908fa47eec9a0921b9538ba068066
feat(compute): update the api https://github.com/googleapis/google-api-python-client/commit/834349f1c54a0be33fb55e3328f88f25fa6a9419
feat(contactcenterinsights): update the api https://github.com/googleapis/google-api-python-client/commit/5482a0bade7167307dbbd81455c023a685318227
feat(dialogflow): update the api https://github.com/googleapis/google-api-python-client/commit/361134dcbcca446cb9e2b004006f3feb1920fd93
feat(displayvideo): update the api https://github.com/googleapis/google-api-python-client/commit/4d43cceda82a1df22fad872e85e1b7236e239ae8
feat(orgpolicy): update the api https://github.com/googleapis/google-api-python-client/commit/ce6c8aad2d1e8f7d6325c2642f61c07e22fddb5c
feat(prod_tt_sasportal): update the api https://github.com/googleapis/google-api-python-client/commit/dbbe2a7c7d9d43564d4032d109dc5e83d4864e84
feat(retail): update the api https://github.com/googleapis/google-api-python-client/commit/4e21ee29bc68bb989519460ede52c04cc66f203e
feat(vmmigration): update the api https://github.com/googleapis/google-api-python-client/commit/8898d540b6ac5801da6854209ff3dee1af7dc176
feat(websecurityscanner): update the api https://github.com/googleapis/google-api-python-client/commit/bb0332e672950a3fbdfe0d383d948a4925bd433f
diff --git a/docs/dyn/composer_v1.projects.locations.environments.html b/docs/dyn/composer_v1.projects.locations.environments.html
index 138f56b..403a97c 100644
--- a/docs/dyn/composer_v1.projects.locations.environments.html
+++ b/docs/dyn/composer_v1.projects.locations.environments.html
@@ -117,11 +117,16 @@
     "databaseConfig": { # The configuration of Cloud SQL instance that is used by the Apache Airflow software. Supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*. # Optional. The configuration settings for Cloud SQL instance used internally by Apache Airflow software. This field is supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*.
       "machineType": "A String", # Optional. Cloud SQL machine type used by Airflow database. It has to be one of: db-n1-standard-2, db-n1-standard-4, db-n1-standard-8 or db-n1-standard-16. If not specified, db-n1-standard-2 will be used.
     },
-    "encryptionConfig": { # The encryption options for the Cloud Composer environment and its dependencies.Supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*. # Optional. The encryption options for the Cloud Composer environment and its dependencies. Cannot be updated. This field is supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*.
+    "encryptionConfig": { # The encryption options for the Cloud Composer environment and its dependencies.Supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*. # Optional. The encryption options for the Cloud Composer environment and its dependencies. Cannot be updated.
       "kmsKeyName": "A String", # Optional. Customer-managed Encryption Key available through Google's Key Management Service. Cannot be updated. If not specified, Google-managed key will be used.
     },
     "environmentSize": "A String", # Optional. The size of the Cloud Composer environment. This field is supported for Cloud Composer environments in versions composer-2.*.*-airflow-*.*.* and newer.
     "gkeCluster": "A String", # Output only. The Kubernetes Engine cluster used to run this environment.
+    "maintenanceWindow": { # The configuration settings for Cloud Composer maintenance window. The following example: ``` { "startTime":"2019-08-01T01:00:00Z" "endTime":"2019-08-01T07:00:00Z" "recurrence":"FREQ=WEEKLY;BYDAY=TU,WE" } ``` would define a maintenance window between 01 and 07 hours UTC during each Tuesday and Wednesday. # Optional. The maintenance window is the period when Cloud Composer components may undergo maintenance. It is defined so that maintenance is not executed during peak hours or critical time periods. The system will not be under maintenance for every occurrence of this window, but when maintenance is planned, it will be scheduled during the window. The maintenance window period must encompass at least 12 hours per week. This may be split into multiple chunks, each with a size of at least 4 hours. If this value is omitted, the default value for maintenance window will be applied. The default value is Saturday and Sunday 00-06 GMT.
+      "endTime": "A String", # Required. Maintenance window end time. It is used only to calculate the duration of the maintenance window. The value for end-time must be in the future, relative to `start_time`.
+      "recurrence": "A String", # Required. Maintenance window recurrence. Format is a subset of [RFC-5545](https://tools.ietf.org/html/rfc5545) `RRULE`. The only allowed values for `FREQ` field are `FREQ=DAILY` and `FREQ=WEEKLY;BYDAY=...` Example values: `FREQ=WEEKLY;BYDAY=TU,WE`, `FREQ=DAILY`.
+      "startTime": "A String", # Required. Start time of the first recurrence of the maintenance window.
+    },
     "nodeConfig": { # The configuration information for the Kubernetes Engine nodes running the Apache Airflow software. # The configuration used for the Kubernetes Engine cluster.
       "diskSizeGb": 42, # Optional. The disk size in GB used for node VMs. Minimum size is 20GB. If unspecified, defaults to 100GB. Cannot be updated. This field is supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*.
       "ipAllocationPolicy": { # Configuration for controlling how IPs are allocated in the GKE cluster running the Apache Airflow software. # Optional. The configuration for controlling how IPs are allocated in the GKE cluster.
@@ -298,11 +303,16 @@
     "databaseConfig": { # The configuration of Cloud SQL instance that is used by the Apache Airflow software. Supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*. # Optional. The configuration settings for Cloud SQL instance used internally by Apache Airflow software. This field is supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*.
       "machineType": "A String", # Optional. Cloud SQL machine type used by Airflow database. It has to be one of: db-n1-standard-2, db-n1-standard-4, db-n1-standard-8 or db-n1-standard-16. If not specified, db-n1-standard-2 will be used.
     },
-    "encryptionConfig": { # The encryption options for the Cloud Composer environment and its dependencies.Supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*. # Optional. The encryption options for the Cloud Composer environment and its dependencies. Cannot be updated. This field is supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*.
+    "encryptionConfig": { # The encryption options for the Cloud Composer environment and its dependencies.Supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*. # Optional. The encryption options for the Cloud Composer environment and its dependencies. Cannot be updated.
       "kmsKeyName": "A String", # Optional. Customer-managed Encryption Key available through Google's Key Management Service. Cannot be updated. If not specified, Google-managed key will be used.
     },
     "environmentSize": "A String", # Optional. The size of the Cloud Composer environment. This field is supported for Cloud Composer environments in versions composer-2.*.*-airflow-*.*.* and newer.
     "gkeCluster": "A String", # Output only. The Kubernetes Engine cluster used to run this environment.
+    "maintenanceWindow": { # The configuration settings for Cloud Composer maintenance window. The following example: ``` { "startTime":"2019-08-01T01:00:00Z" "endTime":"2019-08-01T07:00:00Z" "recurrence":"FREQ=WEEKLY;BYDAY=TU,WE" } ``` would define a maintenance window between 01 and 07 hours UTC during each Tuesday and Wednesday. # Optional. The maintenance window is the period when Cloud Composer components may undergo maintenance. It is defined so that maintenance is not executed during peak hours or critical time periods. The system will not be under maintenance for every occurrence of this window, but when maintenance is planned, it will be scheduled during the window. The maintenance window period must encompass at least 12 hours per week. This may be split into multiple chunks, each with a size of at least 4 hours. If this value is omitted, the default value for maintenance window will be applied. The default value is Saturday and Sunday 00-06 GMT.
+      "endTime": "A String", # Required. Maintenance window end time. It is used only to calculate the duration of the maintenance window. The value for end-time must be in the future, relative to `start_time`.
+      "recurrence": "A String", # Required. Maintenance window recurrence. Format is a subset of [RFC-5545](https://tools.ietf.org/html/rfc5545) `RRULE`. The only allowed values for `FREQ` field are `FREQ=DAILY` and `FREQ=WEEKLY;BYDAY=...` Example values: `FREQ=WEEKLY;BYDAY=TU,WE`, `FREQ=DAILY`.
+      "startTime": "A String", # Required. Start time of the first recurrence of the maintenance window.
+    },
     "nodeConfig": { # The configuration information for the Kubernetes Engine nodes running the Apache Airflow software. # The configuration used for the Kubernetes Engine cluster.
       "diskSizeGb": 42, # Optional. The disk size in GB used for node VMs. Minimum size is 20GB. If unspecified, defaults to 100GB. Cannot be updated. This field is supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*.
       "ipAllocationPolicy": { # Configuration for controlling how IPs are allocated in the GKE cluster running the Apache Airflow software. # Optional. The configuration for controlling how IPs are allocated in the GKE cluster.
@@ -420,11 +430,16 @@
         "databaseConfig": { # The configuration of Cloud SQL instance that is used by the Apache Airflow software. Supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*. # Optional. The configuration settings for Cloud SQL instance used internally by Apache Airflow software. This field is supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*.
           "machineType": "A String", # Optional. Cloud SQL machine type used by Airflow database. It has to be one of: db-n1-standard-2, db-n1-standard-4, db-n1-standard-8 or db-n1-standard-16. If not specified, db-n1-standard-2 will be used.
         },
-        "encryptionConfig": { # The encryption options for the Cloud Composer environment and its dependencies.Supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*. # Optional. The encryption options for the Cloud Composer environment and its dependencies. Cannot be updated. This field is supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*.
+        "encryptionConfig": { # The encryption options for the Cloud Composer environment and its dependencies.Supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*. # Optional. The encryption options for the Cloud Composer environment and its dependencies. Cannot be updated.
           "kmsKeyName": "A String", # Optional. Customer-managed Encryption Key available through Google's Key Management Service. Cannot be updated. If not specified, Google-managed key will be used.
         },
         "environmentSize": "A String", # Optional. The size of the Cloud Composer environment. This field is supported for Cloud Composer environments in versions composer-2.*.*-airflow-*.*.* and newer.
         "gkeCluster": "A String", # Output only. The Kubernetes Engine cluster used to run this environment.
+        "maintenanceWindow": { # The configuration settings for Cloud Composer maintenance window. The following example: ``` { "startTime":"2019-08-01T01:00:00Z" "endTime":"2019-08-01T07:00:00Z" "recurrence":"FREQ=WEEKLY;BYDAY=TU,WE" } ``` would define a maintenance window between 01 and 07 hours UTC during each Tuesday and Wednesday. # Optional. The maintenance window is the period when Cloud Composer components may undergo maintenance. It is defined so that maintenance is not executed during peak hours or critical time periods. The system will not be under maintenance for every occurrence of this window, but when maintenance is planned, it will be scheduled during the window. The maintenance window period must encompass at least 12 hours per week. This may be split into multiple chunks, each with a size of at least 4 hours. If this value is omitted, the default value for maintenance window will be applied. The default value is Saturday and Sunday 00-06 GMT.
+          "endTime": "A String", # Required. Maintenance window end time. It is used only to calculate the duration of the maintenance window. The value for end-time must be in the future, relative to `start_time`.
+          "recurrence": "A String", # Required. Maintenance window recurrence. Format is a subset of [RFC-5545](https://tools.ietf.org/html/rfc5545) `RRULE`. The only allowed values for `FREQ` field are `FREQ=DAILY` and `FREQ=WEEKLY;BYDAY=...` Example values: `FREQ=WEEKLY;BYDAY=TU,WE`, `FREQ=DAILY`.
+          "startTime": "A String", # Required. Start time of the first recurrence of the maintenance window.
+        },
         "nodeConfig": { # The configuration information for the Kubernetes Engine nodes running the Apache Airflow software. # The configuration used for the Kubernetes Engine cluster.
           "diskSizeGb": 42, # Optional. The disk size in GB used for node VMs. Minimum size is 20GB. If unspecified, defaults to 100GB. Cannot be updated. This field is supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*.
           "ipAllocationPolicy": { # Configuration for controlling how IPs are allocated in the GKE cluster running the Apache Airflow software. # Optional. The configuration for controlling how IPs are allocated in the GKE cluster.
@@ -550,11 +565,16 @@
     "databaseConfig": { # The configuration of Cloud SQL instance that is used by the Apache Airflow software. Supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*. # Optional. The configuration settings for Cloud SQL instance used internally by Apache Airflow software. This field is supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*.
       "machineType": "A String", # Optional. Cloud SQL machine type used by Airflow database. It has to be one of: db-n1-standard-2, db-n1-standard-4, db-n1-standard-8 or db-n1-standard-16. If not specified, db-n1-standard-2 will be used.
     },
-    "encryptionConfig": { # The encryption options for the Cloud Composer environment and its dependencies.Supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*. # Optional. The encryption options for the Cloud Composer environment and its dependencies. Cannot be updated. This field is supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*.
+    "encryptionConfig": { # The encryption options for the Cloud Composer environment and its dependencies.Supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*. # Optional. The encryption options for the Cloud Composer environment and its dependencies. Cannot be updated.
       "kmsKeyName": "A String", # Optional. Customer-managed Encryption Key available through Google's Key Management Service. Cannot be updated. If not specified, Google-managed key will be used.
     },
     "environmentSize": "A String", # Optional. The size of the Cloud Composer environment. This field is supported for Cloud Composer environments in versions composer-2.*.*-airflow-*.*.* and newer.
     "gkeCluster": "A String", # Output only. The Kubernetes Engine cluster used to run this environment.
+    "maintenanceWindow": { # The configuration settings for Cloud Composer maintenance window. The following example: ``` { "startTime":"2019-08-01T01:00:00Z" "endTime":"2019-08-01T07:00:00Z" "recurrence":"FREQ=WEEKLY;BYDAY=TU,WE" } ``` would define a maintenance window between 01 and 07 hours UTC during each Tuesday and Wednesday. # Optional. The maintenance window is the period when Cloud Composer components may undergo maintenance. It is defined so that maintenance is not executed during peak hours or critical time periods. The system will not be under maintenance for every occurrence of this window, but when maintenance is planned, it will be scheduled during the window. The maintenance window period must encompass at least 12 hours per week. This may be split into multiple chunks, each with a size of at least 4 hours. If this value is omitted, the default value for maintenance window will be applied. The default value is Saturday and Sunday 00-06 GMT.
+      "endTime": "A String", # Required. Maintenance window end time. It is used only to calculate the duration of the maintenance window. The value for end-time must be in the future, relative to `start_time`.
+      "recurrence": "A String", # Required. Maintenance window recurrence. Format is a subset of [RFC-5545](https://tools.ietf.org/html/rfc5545) `RRULE`. The only allowed values for `FREQ` field are `FREQ=DAILY` and `FREQ=WEEKLY;BYDAY=...` Example values: `FREQ=WEEKLY;BYDAY=TU,WE`, `FREQ=DAILY`.
+      "startTime": "A String", # Required. Start time of the first recurrence of the maintenance window.
+    },
     "nodeConfig": { # The configuration information for the Kubernetes Engine nodes running the Apache Airflow software. # The configuration used for the Kubernetes Engine cluster.
       "diskSizeGb": 42, # Optional. The disk size in GB used for node VMs. Minimum size is 20GB. If unspecified, defaults to 100GB. Cannot be updated. This field is supported for Cloud Composer environments in versions composer-1.*.*-airflow-*.*.*.
       "ipAllocationPolicy": { # Configuration for controlling how IPs are allocated in the GKE cluster running the Apache Airflow software. # Optional. The configuration for controlling how IPs are allocated in the GKE cluster.