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in_tcp: document "send_keepalive_packet" option #438

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in_tcp: document "send_keepalive_packet" option #438

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11 changes: 11 additions & 0 deletions input/tcp.md
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Expand Up @@ -167,6 +167,17 @@ You can set positive value to send FIN on closing on non-Windows.
</source>
```

##### `send_keepalive_packet`

| type | default | available transport type | version |
| :--- | :--- | :--- | :--- |
| bool | false | tcp, tls | 1.15.0 |

Enable `SO_KEEPALIVE` on the underlying TCP sockets.

This is useful when you connect to Fluentd over firewalls or proxies and
want to prevent connections from being closed automatically.

#### TLS configuration

```text
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