Each port that listens for traffic on a particular load balancer is configured separately and
  tied to the load balancer. Multiple listeners can be associated with the same load balancer but
  each must use a unique port.
  Protocol:
  
  The protocol for which the front end listens. The TERMINATED_HTTPS protocol is only available if
  the key-manager service is enabled and you have authority to list certificate containers and
  secrets.
  
  Port:
  
  The port on which the front end listens. Must be an integer from 1 to 65535.
  
  Connection Limit:
  
  The maximum number of connections permitted for this listener.
  Default value is -1 which represents infinite connections.
  
  Default Pool ID:
  
  The ID of the pool used by the listener if no L7 policies match.
  
  Insert Headers:
  
  Additional headers insertion into HTTP header,
  only "X-Forwarded-For", "X-Forwarded-Port" and "X-Forwarded-Proto" are supported.
  
  Client Data Timeout:
  
  Frontend client inactivity timeout in milliseconds. Default: 50000.
  
  TCP Inspect Timeout:
  
  Time, in milliseconds, to wait for additional TCP packets for content
  inspection. Default: 0.
  
  Member Connect Timeout:
  
  Backend member connection timeout in milliseconds. Default: 5000.
  
  Member Data Timeout:
  
  Backend member inactivity timeout in milliseconds. Default: 50000.
  
  Allowed Cidrs:
  
  A newline separated list of cidrs to be allowed to connect to the listener.
  An empty list means allow from any.
  
  TLS Cipher String:
  
  A string of the allowed ciphers using the OpenSSL syntax. The syntax
  is a colon separated list of the chiphers, ex.
  "TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256"
  Note, don't include quotation marks. An empty string sets the default TLS
  Cipher String configured in Octavia.