chore: Update discovery artifacts (#1375)

## Deleted keys were detected in the following stable discovery artifacts:
servicenetworking v1 https://github.com/googleapis/google-api-python-client/commit/c0ad756013c602597e477bc0e22e7b2771689214

## Deleted keys were detected in the following pre-stable discovery artifacts:
retail v2alpha https://github.com/googleapis/google-api-python-client/commit/c9d7a149295d827110c789e464b4f97edc13cbaa
servicenetworking v1beta https://github.com/googleapis/google-api-python-client/commit/c0ad756013c602597e477bc0e22e7b2771689214

## Discovery Artifact Change Summary:
feat(composer): update the api https://github.com/googleapis/google-api-python-client/commit/c2cb2746320fa7b6c1536028794f53576c0f1ddd
feat(compute): update the api https://github.com/googleapis/google-api-python-client/commit/2cdcd0a21223a229e711778a3cf1b38c63521d96
feat(dfareporting): update the api https://github.com/googleapis/google-api-python-client/commit/73f7d790e1585322547fe7cb39c8f36e7b400121
feat(dialogflow): update the api https://github.com/googleapis/google-api-python-client/commit/8edd852f294eaccfa6a0e7288d54a2d751f53506
feat(retail): update the api https://github.com/googleapis/google-api-python-client/commit/c9d7a149295d827110c789e464b4f97edc13cbaa
feat(sasportal): update the api https://github.com/googleapis/google-api-python-client/commit/12683cabbf8deaf0a884147b98c30345786874a6
feat(servicenetworking): update the api https://github.com/googleapis/google-api-python-client/commit/c0ad756013c602597e477bc0e22e7b2771689214
diff --git a/docs/dyn/compute_beta.instances.html b/docs/dyn/compute_beta.instances.html
index 1ca0807..658a8a0 100644
--- a/docs/dyn/compute_beta.instances.html
+++ b/docs/dyn/compute_beta.instances.html
@@ -742,7 +742,7 @@
           "reservationAffinity": { # Specifies the reservations that this instance can consume from. # Specifies the reservations that this instance can consume from.
             "consumeReservationType": "A String", # Specifies the type of reservation from which this instance can consume resources: ANY_RESERVATION (default), SPECIFIC_RESERVATION, or NO_RESERVATION. See  Consuming reserved instances for examples.
             "key": "A String", # Corresponds to the label key of a reservation resource. To target a SPECIFIC_RESERVATION by name, specify googleapis.com/reservation-name as the key and specify the name of your reservation as its value.
-            "values": [ # Corresponds to the label values of a reservation resource.
+            "values": [ # Corresponds to the label values of a reservation resource. This can be either a name to a reservation in the same project or "projects/different-project/reservations/some-reservation-name" to target a shared reservation in the same zone but in a different project.
               "A String",
             ],
           },
@@ -754,6 +754,7 @@
             "automaticRestart": True or False, # Specifies whether the instance should be automatically restarted if it is terminated by Compute Engine (not terminated by a user). You can only set the automatic restart option for standard instances. Preemptible instances cannot be automatically restarted.
                 #
                 # By default, this is set to true so an instance is automatically restarted if it is terminated by Compute Engine.
+            "hostErrorTimeoutSeconds": 42, # Specify the time in seconds for host error detection, the value must be within the range of [90, 330] with the increment of 30, if unset, the default behavior of host error recovery will be used.
             "locationHint": "A String", # An opaque location hint used to place the instance close to other resources. This field is for use by internal tools that use the public API.
             "maintenanceFreezeDurationHours": 42, # Specifies the number of hours after VM instance creation where the VM won't be scheduled for maintenance.
             "maintenanceInterval": "A String", # For more information about maintenance intervals, see Setting maintenance intervals.
@@ -1387,7 +1388,7 @@
     "reservationAffinity": { # Specifies the reservations that this instance can consume from. # Specifies the reservations that instances can consume from.
       "consumeReservationType": "A String", # Specifies the type of reservation from which this instance can consume resources: ANY_RESERVATION (default), SPECIFIC_RESERVATION, or NO_RESERVATION. See  Consuming reserved instances for examples.
       "key": "A String", # Corresponds to the label key of a reservation resource. To target a SPECIFIC_RESERVATION by name, specify googleapis.com/reservation-name as the key and specify the name of your reservation as its value.
-      "values": [ # Corresponds to the label values of a reservation resource.
+      "values": [ # Corresponds to the label values of a reservation resource. This can be either a name to a reservation in the same project or "projects/different-project/reservations/some-reservation-name" to target a shared reservation in the same zone but in a different project.
         "A String",
       ],
     },
@@ -1398,6 +1399,7 @@
       "automaticRestart": True or False, # Specifies whether the instance should be automatically restarted if it is terminated by Compute Engine (not terminated by a user). You can only set the automatic restart option for standard instances. Preemptible instances cannot be automatically restarted.
           #
           # By default, this is set to true so an instance is automatically restarted if it is terminated by Compute Engine.
+      "hostErrorTimeoutSeconds": 42, # Specify the time in seconds for host error detection, the value must be within the range of [90, 330] with the increment of 30, if unset, the default behavior of host error recovery will be used.
       "locationHint": "A String", # An opaque location hint used to place the instance close to other resources. This field is for use by internal tools that use the public API.
       "maintenanceFreezeDurationHours": 42, # Specifies the number of hours after VM instance creation where the VM won't be scheduled for maintenance.
       "maintenanceInterval": "A String", # For more information about maintenance intervals, see Setting maintenance intervals.
@@ -2084,7 +2086,7 @@
   "reservationAffinity": { # Specifies the reservations that this instance can consume from. # Specifies the reservations that this instance can consume from.
     "consumeReservationType": "A String", # Specifies the type of reservation from which this instance can consume resources: ANY_RESERVATION (default), SPECIFIC_RESERVATION, or NO_RESERVATION. See  Consuming reserved instances for examples.
     "key": "A String", # Corresponds to the label key of a reservation resource. To target a SPECIFIC_RESERVATION by name, specify googleapis.com/reservation-name as the key and specify the name of your reservation as its value.
-    "values": [ # Corresponds to the label values of a reservation resource.
+    "values": [ # Corresponds to the label values of a reservation resource. This can be either a name to a reservation in the same project or "projects/different-project/reservations/some-reservation-name" to target a shared reservation in the same zone but in a different project.
       "A String",
     ],
   },
@@ -2096,6 +2098,7 @@
     "automaticRestart": True or False, # Specifies whether the instance should be automatically restarted if it is terminated by Compute Engine (not terminated by a user). You can only set the automatic restart option for standard instances. Preemptible instances cannot be automatically restarted.
         #
         # By default, this is set to true so an instance is automatically restarted if it is terminated by Compute Engine.
+    "hostErrorTimeoutSeconds": 42, # Specify the time in seconds for host error detection, the value must be within the range of [90, 330] with the increment of 30, if unset, the default behavior of host error recovery will be used.
     "locationHint": "A String", # An opaque location hint used to place the instance close to other resources. This field is for use by internal tools that use the public API.
     "maintenanceFreezeDurationHours": 42, # Specifies the number of hours after VM instance creation where the VM won't be scheduled for maintenance.
     "maintenanceInterval": "A String", # For more information about maintenance intervals, see Setting maintenance intervals.
@@ -3000,7 +3003,7 @@
   "reservationAffinity": { # Specifies the reservations that this instance can consume from. # Specifies the reservations that this instance can consume from.
     "consumeReservationType": "A String", # Specifies the type of reservation from which this instance can consume resources: ANY_RESERVATION (default), SPECIFIC_RESERVATION, or NO_RESERVATION. See  Consuming reserved instances for examples.
     "key": "A String", # Corresponds to the label key of a reservation resource. To target a SPECIFIC_RESERVATION by name, specify googleapis.com/reservation-name as the key and specify the name of your reservation as its value.
-    "values": [ # Corresponds to the label values of a reservation resource.
+    "values": [ # Corresponds to the label values of a reservation resource. This can be either a name to a reservation in the same project or "projects/different-project/reservations/some-reservation-name" to target a shared reservation in the same zone but in a different project.
       "A String",
     ],
   },
@@ -3012,6 +3015,7 @@
     "automaticRestart": True or False, # Specifies whether the instance should be automatically restarted if it is terminated by Compute Engine (not terminated by a user). You can only set the automatic restart option for standard instances. Preemptible instances cannot be automatically restarted.
         #
         # By default, this is set to true so an instance is automatically restarted if it is terminated by Compute Engine.
+    "hostErrorTimeoutSeconds": 42, # Specify the time in seconds for host error detection, the value must be within the range of [90, 330] with the increment of 30, if unset, the default behavior of host error recovery will be used.
     "locationHint": "A String", # An opaque location hint used to place the instance close to other resources. This field is for use by internal tools that use the public API.
     "maintenanceFreezeDurationHours": 42, # Specifies the number of hours after VM instance creation where the VM won't be scheduled for maintenance.
     "maintenanceInterval": "A String", # For more information about maintenance intervals, see Setting maintenance intervals.
@@ -3488,7 +3492,7 @@
       "reservationAffinity": { # Specifies the reservations that this instance can consume from. # Specifies the reservations that this instance can consume from.
         "consumeReservationType": "A String", # Specifies the type of reservation from which this instance can consume resources: ANY_RESERVATION (default), SPECIFIC_RESERVATION, or NO_RESERVATION. See  Consuming reserved instances for examples.
         "key": "A String", # Corresponds to the label key of a reservation resource. To target a SPECIFIC_RESERVATION by name, specify googleapis.com/reservation-name as the key and specify the name of your reservation as its value.
-        "values": [ # Corresponds to the label values of a reservation resource.
+        "values": [ # Corresponds to the label values of a reservation resource. This can be either a name to a reservation in the same project or "projects/different-project/reservations/some-reservation-name" to target a shared reservation in the same zone but in a different project.
           "A String",
         ],
       },
@@ -3500,6 +3504,7 @@
         "automaticRestart": True or False, # Specifies whether the instance should be automatically restarted if it is terminated by Compute Engine (not terminated by a user). You can only set the automatic restart option for standard instances. Preemptible instances cannot be automatically restarted.
             #
             # By default, this is set to true so an instance is automatically restarted if it is terminated by Compute Engine.
+        "hostErrorTimeoutSeconds": 42, # Specify the time in seconds for host error detection, the value must be within the range of [90, 330] with the increment of 30, if unset, the default behavior of host error recovery will be used.
         "locationHint": "A String", # An opaque location hint used to place the instance close to other resources. This field is for use by internal tools that use the public API.
         "maintenanceFreezeDurationHours": 42, # Specifies the number of hours after VM instance creation where the VM won't be scheduled for maintenance.
         "maintenanceInterval": "A String", # For more information about maintenance intervals, see Setting maintenance intervals.
@@ -5102,6 +5107,7 @@
   "automaticRestart": True or False, # Specifies whether the instance should be automatically restarted if it is terminated by Compute Engine (not terminated by a user). You can only set the automatic restart option for standard instances. Preemptible instances cannot be automatically restarted.
       # 
       # By default, this is set to true so an instance is automatically restarted if it is terminated by Compute Engine.
+  "hostErrorTimeoutSeconds": 42, # Specify the time in seconds for host error detection, the value must be within the range of [90, 330] with the increment of 30, if unset, the default behavior of host error recovery will be used.
   "locationHint": "A String", # An opaque location hint used to place the instance close to other resources. This field is for use by internal tools that use the public API.
   "maintenanceFreezeDurationHours": 42, # Specifies the number of hours after VM instance creation where the VM won't be scheduled for maintenance.
   "maintenanceInterval": "A String", # For more information about maintenance intervals, see Setting maintenance intervals.
@@ -6284,7 +6290,7 @@
   "reservationAffinity": { # Specifies the reservations that this instance can consume from. # Specifies the reservations that this instance can consume from.
     "consumeReservationType": "A String", # Specifies the type of reservation from which this instance can consume resources: ANY_RESERVATION (default), SPECIFIC_RESERVATION, or NO_RESERVATION. See  Consuming reserved instances for examples.
     "key": "A String", # Corresponds to the label key of a reservation resource. To target a SPECIFIC_RESERVATION by name, specify googleapis.com/reservation-name as the key and specify the name of your reservation as its value.
-    "values": [ # Corresponds to the label values of a reservation resource.
+    "values": [ # Corresponds to the label values of a reservation resource. This can be either a name to a reservation in the same project or "projects/different-project/reservations/some-reservation-name" to target a shared reservation in the same zone but in a different project.
       "A String",
     ],
   },
@@ -6296,6 +6302,7 @@
     "automaticRestart": True or False, # Specifies whether the instance should be automatically restarted if it is terminated by Compute Engine (not terminated by a user). You can only set the automatic restart option for standard instances. Preemptible instances cannot be automatically restarted.
         #
         # By default, this is set to true so an instance is automatically restarted if it is terminated by Compute Engine.
+    "hostErrorTimeoutSeconds": 42, # Specify the time in seconds for host error detection, the value must be within the range of [90, 330] with the increment of 30, if unset, the default behavior of host error recovery will be used.
     "locationHint": "A String", # An opaque location hint used to place the instance close to other resources. This field is for use by internal tools that use the public API.
     "maintenanceFreezeDurationHours": 42, # Specifies the number of hours after VM instance creation where the VM won't be scheduled for maintenance.
     "maintenanceInterval": "A String", # For more information about maintenance intervals, see Setting maintenance intervals.