monitor_ssl_key

The private key used for the Server Health and Metrics HTTPS listen. If it is included in the digital certificate in monitor_ssl_identity, then this parameter is not needed.

monitor_ssl_key = private_key

If this parameter is not specified, the private key file configured for the server’s TLS listen is used in its place. If neither are specified, the server will fail to start up.

This parameter supports private keys in the following formats: PEM, DER, PKCS#8, PKCS#12.

You must specify a path to a file that contains the key.