Merge pull request #354 from ashie/in-syslog-keepalive

in_syslog: Add a new & a missing parameter

Author: kenhys

input/syslog.md

@@ -239,6 +239,22 @@ Emits unmatched lines when `<parse>` format is not matched for incoming logs.
 
 Emitted record is `{"unmatched_line" : "incoming line"}` with `${tag parameter}.unmatched` tag.
 
+### `resolve_hostname`
+
+| type | default | version |
+| :--- | :--- | :--- |
+| bool | nil | 0.14.19 |
+
+Tries to resolve hostname from IP addresses or not. Cannot set `false` when `source_hostname_key` is set.
+
+### `send_keepalive_packet`
+
+| type | default | version |
+| :--- | :--- | :--- |
+| bool | false | 1.14.0 |
+
+Enables the TCP keepalive for sockets. See [socket article](../plugin-helper-overview/api-plugin-helper-socket.md#send_keepalive_packet-usecase) for more details.
+
 ### `source_hostname_key`
 
 | type | default | version |