public Builder key(@Nullable Output<String> key) {
            $.key = key;
            return this;
        }
@param key Key is the taint key that the toleration applies to. Empty means match all taint keys. If the key is empty, operator must be Exists; this combination means to match all values and all keys. Must be a label name.

@return builder
sdk/java/src/main/java/com/pulumi/kubernetes/resource/v1beta2/inputs/DeviceTolerationPatchArgs.java