inputs: forward: update options

  - fix default size of buffer_chunk_size and buffer_max_size
  - add unix_path option
  - remove forward://ip:port style

Signed-off-by: Takahiro Yamashita <nokute78@gmail.com>

Author: nokute78

pipeline/inputs/forward.md

@@ -10,8 +10,9 @@ The plugin supports the following configuration parameters:
 | :--- | :--- | :--- |
 | Listen | Listener network interface. | 0.0.0.0 |
 | Port | TCP port to listen for incoming connections. | 24224 |
-| Buffer\_Max\_Size | Specify the maximum buffer memory size used to receive a Forward message. The value must be according to the [Unit Size](../../administration/configuring-fluent-bit/unit-sizes.md) specification. | _Buffer\_Chunk\_Size_ |
-| Buffer\_Chunk\_Size | By default the buffer to store the incoming Forward messages, do not allocate the maximum memory allowed, instead it allocate memory when is required. The rounds of allocations are set by _Buffer\_Chunk\_Size_. The value must be according to the [Unit Size ](../../administration/configuring-fluent-bit/unit-sizes.md)specification. | 32KB |
+| Unix_Path |Specify the path to unix socket to receive a Forward message. If set, `Listen` and `Port` are ignored. | |
+| Buffer\_Max\_Size | Specify the maximum buffer memory size used to receive a Forward message. The value must be according to the [Unit Size](../../administration/configuring-fluent-bit/unit-sizes.md) specification. | 6144000 |
+| Buffer\_Chunk\_Size | By default the buffer to store the incoming Forward messages, do not allocate the maximum memory allowed, instead it allocate memory when is required. The rounds of allocations are set by _Buffer\_Chunk\_Size_. The value must be according to the [Unit Size ](../../administration/configuring-fluent-bit/unit-sizes.md)specification. | 1024000 |
 
 ## Getting Started
 
@@ -28,7 +29,7 @@ $ fluent-bit -i forward -o stdout
 By default the service will listen an all interfaces \(0.0.0.0\) through TCP port 24224, optionally you can change this directly, e.g:
 
 ```bash
-$ fluent-bit -i forward://192.168.3.2:9090 -o stdout
+$ fluent-bit -i forward -p listen="192.168.3.2" -p port=9090 -o stdout
 ```
 
 In the example the Forward messages will only arrive through network interface under 192.168.3.2 address and TCP Port 9090.