/// <summary>
        ///     Determine whether a Deployment owns a ReplicaSet.
        /// </summary>
        /// <param name="replicaSet">
        ///     The ReplicaSet to examine.
        /// </param>
        /// <param name="deployment">
        ///     The Deployment to examine.
        /// </param>
        /// <returns>
        ///     <c>true</c>, if the ReplicaSet has an owner-reference to the Deployment; otherwise, <c>false</c>.
        /// </returns>
        public static bool IsOwnedBy(this ReplicaSetV1 replicaSet, DeploymentV1 deployment)
        {
            if (replicaSet == null)
            {
                throw new ArgumentNullException(nameof(replicaSet));
            }

            if (deployment == null)
            {
                throw new ArgumentNullException(nameof(deployment));
            }

            if (replicaSet.Metadata == null)
            {
                throw new ArgumentException("Cannot evaluate ownership of the supplied ReplicaSet because its Metadata is null.", nameof(replicaSet));
            }

            if (deployment.Metadata == null)
            {
                throw new ArgumentException("Cannot evaluate ownership of the supplied ReplicaSet because the supplied Deployment's Metadata is null.", nameof(replicaSet));
            }

            bool isOwnedBy = replicaSet.Metadata.OwnerReferences.Any(ownerReference =>
                                                                     ownerReference.Kind == deployment.Kind
                                                                     &&
                                                                     ownerReference.ApiVersion == deployment.ApiVersion
                                                                     &&
                                                                     ownerReference.Name == deployment.Metadata.Name
                                                                     );

            return(isOwnedBy);
        }
        /// <summary>
        ///     Determine the revision (represented by the "deployment.kubernetes.io/revision" annotation) of the Deployment represented by the ReplicaSet.
        /// </summary>
        /// <param name="deployment">
        ///     The <see cref="ReplicaSetV1"/> model.
        /// </param>
        /// <returns>
        ///     The revision, if present; <c>null</c>, if the annotation is absent or not a number.
        /// </returns>
        public static int?GetRevision(this ReplicaSetV1 deployment)
        {
            if (deployment == null)
            {
                throw new ArgumentNullException(nameof(deployment));
            }

            if (deployment.Metadata == null)
            {
                return(null);
            }

            string rawRevision;

            if (!deployment.Metadata.Annotations.TryGetValue(K8sAnnotations.Deployment.Revision, out rawRevision))
            {
                return(null);
            }

            int revision;

            if (!Int32.TryParse(rawRevision, out revision))
            {
                return(null);
            }

            return(revision);
        }