chore: regens API reference docs (#889)

diff --git a/docs/dyn/container_v1.projects.zones.operations.html b/docs/dyn/container_v1.projects.zones.operations.html
index ea6129b..8f5a45d 100644
--- a/docs/dyn/container_v1.projects.zones.operations.html
+++ b/docs/dyn/container_v1.projects.zones.operations.html
@@ -75,7 +75,7 @@
 <h1><a href="container_v1.html">Kubernetes Engine API</a> . <a href="container_v1.projects.html">projects</a> . <a href="container_v1.projects.zones.html">zones</a> . <a href="container_v1.projects.zones.operations.html">operations</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#cancel">cancel(projectId, zone, operationId, body, x__xgafv=None)</a></code></p>
+  <code><a href="#cancel">cancel(projectId, zone, operationId, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Cancels the specified operation.</p>
 <p class="toc_element">
   <code><a href="#get">get(projectId, zone, operationId, name=None, x__xgafv=None)</a></code></p>
@@ -85,7 +85,7 @@
 <p class="firstline">Lists all operations in a project in a specific zone or all zones.</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="cancel">cancel(projectId, zone, operationId, body, x__xgafv=None)</code>
+    <code class="details" id="cancel">cancel(projectId, zone, operationId, body=None, x__xgafv=None)</code>
   <pre>Cancels the specified operation.
 
 Args:
@@ -93,11 +93,12 @@
 number](https://support.google.com/cloud/answer/6158840).
 This field has been deprecated and replaced by the name field. (required)
   zone: string, Deprecated. The name of the Google Compute Engine
-[zone](/compute/docs/zones#available) in which the operation resides.
-This field has been deprecated and replaced by the name field. (required)
+[zone](https://cloud.google.com/compute/docs/zones#available) in which the
+operation resides. This field has been deprecated and replaced by the name
+field. (required)
   operationId: string, Deprecated. The server-assigned `name` of the operation.
 This field has been deprecated and replaced by the name field. (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # CancelOperationRequest cancels a single operation.
@@ -107,8 +108,9 @@
     "name": "A String", # The name (project, location, operation id) of the operation to cancel.
         # Specified in the format 'projects/*/locations/*/operations/*'.
     "zone": "A String", # Deprecated. The name of the Google Compute Engine
-        # [zone](/compute/docs/zones#available) in which the operation resides.
-        # This field has been deprecated and replaced by the name field.
+        # [zone](https://cloud.google.com/compute/docs/zones#available) in which the
+        # operation resides. This field has been deprecated and replaced by the name
+        # field.
     "operationId": "A String", # Deprecated. The server-assigned `name` of the operation.
         # This field has been deprecated and replaced by the name field.
   }
@@ -142,9 +144,9 @@
 number](https://support.google.com/cloud/answer/6158840).
 This field has been deprecated and replaced by the name field. (required)
   zone: string, Deprecated. The name of the Google Compute Engine
-[zone](/compute/docs/zones#available) in which the cluster
-resides.
-This field has been deprecated and replaced by the name field. (required)
+[zone](https://cloud.google.com/compute/docs/zones#available) in which the
+cluster resides. This field has been deprecated and replaced by the name
+field. (required)
   operationId: string, Deprecated. The server-assigned `name` of the operation.
 This field has been deprecated and replaced by the name field. (required)
   name: string, The name (project, location, operation id) of the operation to get.
@@ -163,18 +165,11 @@
     "selfLink": "A String", # Server-defined URL for the resource.
     "name": "A String", # The server-assigned ID for the operation.
     "zone": "A String", # The name of the Google Compute Engine
-        # [zone](/compute/docs/zones#available) in which the operation
-        # is taking place.
-        # This field is deprecated, use location instead.
-    "startTime": "A String", # [Output only] The time the operation started, in
-        # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
+        # [zone](https://cloud.google.com/compute/docs/zones#available) in which the
+        # operation is taking place. This field is deprecated, use location instead.
     "detail": "A String", # Detailed operation progress, if available.
     "operationType": "A String", # The operation type.
     "targetLink": "A String", # Server-defined URL for the target of the operation.
-    "location": "A String", # [Output only] The name of the Google Compute Engine
-        # [zone](/compute/docs/regions-zones/regions-zones#available) or
-        # [region](/compute/docs/regions-zones/regions-zones#available) in which
-        # the cluster resides.
     "nodepoolConditions": [ # Which conditions caused the current node pool state.
       { # StatusCondition describes why a cluster or a node pool has a certain status
           # (e.g., ERROR or DEGRADED).
@@ -182,9 +177,6 @@
         "code": "A String", # Machine-friendly representation of the condition
       },
     ],
-    "endTime": "A String", # [Output only] The time the operation completed, in
-        # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
-    "statusMessage": "A String", # If an error has occurred, a textual description of the error.
     "clusterConditions": [ # Which conditions caused the current cluster state.
       { # StatusCondition describes why a cluster or a node pool has a certain status
           # (e.g., ERROR or DEGRADED).
@@ -192,6 +184,38 @@
         "code": "A String", # Machine-friendly representation of the condition
       },
     ],
+    "startTime": "A String", # [Output only] The time the operation started, in
+        # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
+    "progress": { # Information about operation (or operation stage) progress. # Output only. [Output only] Progress information for an operation.
+      "status": "A String", # Status of an operation stage.
+          # Unset for single-stage operations.
+      "metrics": [ # Progress metric bundle, for example:
+          #   metrics: [{name: "nodes done",     int_value: 15},
+          #             {name: "nodes total",    int_value: 32}]
+          # or
+          #   metrics: [{name: "progress",       double_value: 0.56},
+          #             {name: "progress scale", double_value: 1.0}]
+        { # Progress metric is (string, int|float|string) pair.
+          "stringValue": "A String", # For metrics with custom values (ratios, visual progress, etc.).
+          "intValue": "A String", # For metrics with integer value.
+          "name": "A String", # Required. Metric name, e.g., "nodes total", "percent done".
+          "doubleValue": 3.14, # For metrics with floating point value.
+        },
+      ],
+      "stages": [ # Substages of an operation or a stage.
+        # Object with schema name: OperationProgress
+      ],
+      "name": "A String", # A non-parameterized string describing an operation stage.
+          # Unset for single-stage operations.
+    },
+    "endTime": "A String", # [Output only] The time the operation completed, in
+        # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
+    "statusMessage": "A String", # Output only. If an error has occurred, a textual description of the error.
+    "location": "A String", # [Output only] The name of the Google Compute Engine
+        # [zone](https://cloud.google.com/compute/docs/regions-zones/regions-zones#available)
+        # or
+        # [region](https://cloud.google.com/compute/docs/regions-zones/regions-zones#available)
+        # in which the cluster resides.
   }</pre>
 </div>
 
@@ -204,8 +228,9 @@
 number](https://support.google.com/cloud/answer/6158840).
 This field has been deprecated and replaced by the parent field. (required)
   zone: string, Deprecated. The name of the Google Compute Engine
-[zone](/compute/docs/zones#available) to return operations for, or `-` for
-all zones. This field has been deprecated and replaced by the parent field. (required)
+[zone](https://cloud.google.com/compute/docs/zones#available) to return
+operations for, or `-` for all zones. This field has been deprecated and
+replaced by the parent field. (required)
   parent: string, The parent (project and location) where the operations will be listed.
 Specified in the format 'projects/*/locations/*'.
 Location "-" matches all zones and all regions.
@@ -225,18 +250,11 @@
         "selfLink": "A String", # Server-defined URL for the resource.
         "name": "A String", # The server-assigned ID for the operation.
         "zone": "A String", # The name of the Google Compute Engine
-            # [zone](/compute/docs/zones#available) in which the operation
-            # is taking place.
-            # This field is deprecated, use location instead.
-        "startTime": "A String", # [Output only] The time the operation started, in
-            # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
+            # [zone](https://cloud.google.com/compute/docs/zones#available) in which the
+            # operation is taking place. This field is deprecated, use location instead.
         "detail": "A String", # Detailed operation progress, if available.
         "operationType": "A String", # The operation type.
         "targetLink": "A String", # Server-defined URL for the target of the operation.
-        "location": "A String", # [Output only] The name of the Google Compute Engine
-            # [zone](/compute/docs/regions-zones/regions-zones#available) or
-            # [region](/compute/docs/regions-zones/regions-zones#available) in which
-            # the cluster resides.
         "nodepoolConditions": [ # Which conditions caused the current node pool state.
           { # StatusCondition describes why a cluster or a node pool has a certain status
               # (e.g., ERROR or DEGRADED).
@@ -244,9 +262,6 @@
             "code": "A String", # Machine-friendly representation of the condition
           },
         ],
-        "endTime": "A String", # [Output only] The time the operation completed, in
-            # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
-        "statusMessage": "A String", # If an error has occurred, a textual description of the error.
         "clusterConditions": [ # Which conditions caused the current cluster state.
           { # StatusCondition describes why a cluster or a node pool has a certain status
               # (e.g., ERROR or DEGRADED).
@@ -254,6 +269,38 @@
             "code": "A String", # Machine-friendly representation of the condition
           },
         ],
+        "startTime": "A String", # [Output only] The time the operation started, in
+            # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
+        "progress": { # Information about operation (or operation stage) progress. # Output only. [Output only] Progress information for an operation.
+          "status": "A String", # Status of an operation stage.
+              # Unset for single-stage operations.
+          "metrics": [ # Progress metric bundle, for example:
+              #   metrics: [{name: "nodes done",     int_value: 15},
+              #             {name: "nodes total",    int_value: 32}]
+              # or
+              #   metrics: [{name: "progress",       double_value: 0.56},
+              #             {name: "progress scale", double_value: 1.0}]
+            { # Progress metric is (string, int|float|string) pair.
+              "stringValue": "A String", # For metrics with custom values (ratios, visual progress, etc.).
+              "intValue": "A String", # For metrics with integer value.
+              "name": "A String", # Required. Metric name, e.g., "nodes total", "percent done".
+              "doubleValue": 3.14, # For metrics with floating point value.
+            },
+          ],
+          "stages": [ # Substages of an operation or a stage.
+            # Object with schema name: OperationProgress
+          ],
+          "name": "A String", # A non-parameterized string describing an operation stage.
+              # Unset for single-stage operations.
+        },
+        "endTime": "A String", # [Output only] The time the operation completed, in
+            # [RFC3339](https://www.ietf.org/rfc/rfc3339.txt) text format.
+        "statusMessage": "A String", # Output only. If an error has occurred, a textual description of the error.
+        "location": "A String", # [Output only] The name of the Google Compute Engine
+            # [zone](https://cloud.google.com/compute/docs/regions-zones/regions-zones#available)
+            # or
+            # [region](https://cloud.google.com/compute/docs/regions-zones/regions-zones#available)
+            # in which the cluster resides.
       },
     ],
     "missingZones": [ # If any zones are listed here, the list of operations returned