*/
    public String getPrivateKey() {
        return privateKey;
    }

    /**
     * Set the absolute path to private key file.
     *
     * @param privateKey path to private key in local file system
     */
    public void setPrivateKey(final String privateKey) {
        this.privateKey = privateKey;
    }

                                    - MUTUAL
                                    - ISTIO_MUTUAL
                                    type: string
                                  privateKey:
                                    description: REQUIRED if mode is `MUTUAL`.
                                    type: string
                                  sni: