private void ensurePermissionDeniedBucketIdsIsMutable() {
        if (!permissionDeniedBucketIds_.isModifiable()) {
          permissionDeniedBucketIds_ =
              new com.google.protobuf.LazyStringArrayList(permissionDeniedBucketIds_);
        }
        bitField0_ |= 0x00000004;
      }
<pre>
Optional. Count of buckets with permission denied errors.
</pre>

<code>int64 permission_denied_count = 2 [(.google.api.field_behavior) = OPTIONAL];</code>

@return This builder for chaining.
java-storageinsights/proto-google-cloud-storageinsights-v1/src/main/java/com/google/cloud/storageinsights/v1/DatasetConfig.java