Backend.md in fastly-8.2.0

- old
+ new
@@ -31,9 +31,13 @@
 | **ssl_ciphers** | **String** | List of [OpenSSL ciphers](https://www.openssl.org/docs/man1.1.1/man1/ciphers.html) to support for connections to this origin. If your backend server is not able to negotiate a connection meeting this constraint, a synthetic `503` error response will be generated. | [optional] |
 | **ssl_client_cert** | **String** | Client certificate attached to origin. | [optional] |
 | **ssl_client_key** | **String** | Client key attached to origin. | [optional] |
 | **ssl_hostname** | **String** | Use `ssl_cert_hostname` and `ssl_sni_hostname` to configure certificate validation. | [optional] |
 | **ssl_sni_hostname** | **String** | Overrides `ssl_hostname`, but only for SNI in the handshake. Does not affect cert validation at all. | [optional] |
+| **tcp_keepalive_enable** | **Boolean** | Whether to enable TCP keepalives for backend connections. Varnish defaults to using keepalives if this is unspecified. | [optional] |
+| **tcp_keepalive_interval** | **Integer** | Interval in seconds between subsequent keepalive probes. | [optional] |
+| **tcp_keepalive_probes** | **Integer** | Number of unacknowledged probes to send before considering the connection dead. | [optional] |
+| **tcp_keepalive_time** | **Integer** | Interval in seconds between the last data packet sent and the first keepalive probe. | [optional] |
 | **use_ssl** | **Boolean** | Whether or not to require TLS for connections to this backend. | [optional] |
 | **weight** | **Integer** | Weight used to load balance this backend against others. May be any positive integer. If `auto_loadbalance` is true, the chance of this backend being selected is equal to its own weight over the sum of all weights for backends that have `auto_loadbalance` set to true. | [optional] |
 
 [[Back to API list]](../../README.md#endpoints) [[Back to README]](../../README.md)
 