add sample

docs/cn/plugins/processor/native/processor-spl.md

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+# Json解析原生处理插件
+
+## 简介
+
+`processor_parse_json_native`插件解析事件中`Json`格式字段内容并提取新字段。
+
+## 版本
+
+[Stable](../stability-level.md)
+
+## 配置参数
+
+|  **参数**  |  **类型**  |  **是否必填**  |  **默认值**  |  **说明**  |
+| --- | --- | --- | --- | --- |
+|  Type  |  string  |  是  |  /  |  插件类型。固定为processor\_spl。  |
+|  Script  |  string  |  是  |  /  |  spl语句  |
+|  TimeoutMilliSeconds  |  int  |  否  |  1000  |  执行脚本的超时时间，单位为毫秒  |
+|  MaxMemoryBytes  |  int  |  否  |  50*1024*1024  |  spl执行最大内存配置，单位为字节  |
+
+## 样例
+
+采集文件`/home/test-log/test.log`，解析日志内容并提取字段，并将结果输出到stdout。
+
+- 输入
+
+```
+[2024-01-05T12:07:00.123456] {"message": "this is a msg", "level": "INFO", "garbage": "xxx"} java.lang.Exception: exception
+```
+
+- 采集配置
+
+```yaml
+enable: true
+inputs:
+  - Type: input_file
+    FilePaths:
+      - /home/test-log/test.log
+    Multiline:
+      StartPattern: \[\d+.*
+processors:
+  - Type: processor_spl
+    Script: '* | parse-regexp content, ''\[([^]]+)]\s+([^}]+})\s+([\S\s]*)'' as time,json,stack | parse-json json | project-away garbage,json,content'
+flushers:
+  - Type: flusher_stdout
+    OnlyStdout: true
+```
+
+- 输出
+
+```json
+{
+    "__tag__:__path__": "/home/test-log/test.log",
+	"message": "this is a msg",
+	"level": "INFO",
+	"time": "2024-01-05T12:07:00.123456",
+	"stack": "java.lang.Exception: exception",
+    "__time__": "1657161028"
+}
+```

example_config/data_pipelines/file-spl.yaml

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+# Copyright 2022 iLogtail Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# To collect json format data from file.
+# Before Process: 
+# [2024-01-05T12:07:00.123456] {"message": "this is a msg", "level": "INFO", "garbage": "xxx"} java.lang.Exception: exception
+# After Process: 
+# {"message": "this is a msg", "level": "INFO", "time": "2024-01-05T12:07:00.123456", "stack":"java.lang.Exception: exception"}
+# You may change SourceKey and other parameters.
+# For a full list of parameters, visit https://ilogtail.gitbook.io/ilogtail-docs/plugins/processor/spl
+
+enable: true
+inputs:
+  - Type: input_file
+    FilePaths:
+      - /home/test-log/test.log
+    Multiline:
+      StartPattern: \[\d+.*
+processors:
+  - Type: processor_spl
+    Script: '* | parse-regexp content, ''\[([^]]+)]\s+([^}]+})\s+([\S\s]*)'' as time,json,stack | parse-json json | project-away garbage,json,content'
+flushers:
+  - Type: flusher_sls
+    Endpoint: cn-xxx.log.aliyuncs.com
+    ProjectName: test_project
+    LogstoreName: test_logstore
+  - Type: flusher_stdout
+    OnlyStdout: true