pipeline: filters: sysinfo: add document for sysinfo plugin

SUMMARY.md

@@ -144,6 +144,7 @@
   * [Nightfall](pipeline/filters/nightfall.md)
   * [Rewrite Tag](pipeline/filters/rewrite-tag.md)
   * [Standard Output](pipeline/filters/standard-output.md)
+  * [Sysinfo](pipeline/filters/sysinfo.md)
   * [Throttle](pipeline/filters/throttle.md)
   * [Tensorflow](pipeline/filters/tensorflow.md)
   * [Wasm](pipeline/filters/wasm.md)

installation/sources/build-and-install.md

@@ -171,6 +171,7 @@ The _filter plugins_ allows to modify, enrich or drop records. The following tab
 | [FLB\_FILTER\_RECORD\_MODIFIER](../../pipeline/filters/record-modifier.md) | Enable Record Modifier filter | On |
 | [FLB\_FILTER\_REWRITE\_TAG](../../pipeline/filters/rewrite-tag.md) | Enable Rewrite Tag filter | On |
 | [FLB\_FILTER\_STDOUT](../../pipeline/filters/standard-output.md) | Enable Stdout filter | On |
+| [FLB\_FILTER\_SYSINFO](../../pipeline/filters/sysinfo.md) | Enable Sysinfo filter | On |
 | [FLB\_FILTER\_THROTTLE](../../pipeline/filters/throttle.md) | Enable Throttle filter | On |
 | [FLB\_FILTER\_WASM](../../pipeline/filters/wasm.md) | Enable WASM filter | On |
 

pipeline/filters/sysinfo.md

@@ -0,0 +1,50 @@
+# Sysinfo
+
+The _Sysinfo Filter_ plugin allows to append system information like fluent-bit version or hostname.
+
+## Configuration Prameters
+
+The plugin supports the following configuration parameters:
+
+|Key|Description|Supported platform|
+|---|---|---|
+|fluentbit_version_key|Specify the key name for fluent-bit version.| All |
+|os_name_key|Specify the key name for os name. e.g. linux, win64 or macos.| All |
+|hostname_key|Specify the key name for hostname.| All|
+|os_version_key|Specify the key name for os version. It is not supported on some platforms. | Linux |
+|kernel_version_key|Specify the key name for kernel version. It is not supported on some platforms.| Linux |
+
+Some properties are supported by specific platform.
+
+## Getting Started
+
+In order to start filtering records, you can run the filter from the command line or through the configuration file.
+
+The following configuration file is to append fluent-bit version and OS name.
+
+```
+[INPUT]
+    Name dummy
+    Tag test
+
+[FILTER]
+    Name sysinfo
+    Match *
+    Fluentbit_version_key flb_ver
+    Os_name_key os_name
+
+[OUTPUT]
+    name stdout
+    match *
+```
+
+You can also run the filter from command line.
+
+```
+fluent-bit -i dummy -o stdout -F sysinfo -m '*' -p fluentbit_version_key=flb_ver -p os_name_key=os_name
+```
+
+The output will be 
+```
+[0] dummy.0: [[1699172858.989654355, {}], {"message"=>"dummy", "flb_ver"=>"2.2.0", "os_name"=>"linux"}]
+```