refactor: header key value exceed

Author: alick-liming

flashduty/en/1. On-call/8. Integrations/8.1 Alerts integration/8.1.54 Label Mapping API.md

@@ -175,7 +175,7 @@ To prevent security bypasses, request smuggling, IP spoofing, and cache poisonin
 ### Header Best Practices
 
 1. **Allowlist Mode**: It is recommended to only allow custom Headers prefixed with `X-Custom-` or `X-Enrich-`
-2. **Length Limits**: The Key or Value length of a single Header should not exceed 1024 bytes
+2. **Length Limits**: The Key length of a single Header should not exceed 1024 bytes, the Value length of a single Header should not exceed 4096 bytes
 3. **Format Validation**: Header Values must not contain line breaks (`\r`, `\n`) to prevent Header injection attacks
 
 ## V. Best Practices

flashduty/zh/1. On-call/5. 集成引导/8.1 告警集成/8.1.54 标签映射API.md

@@ -175,7 +175,7 @@ POST, Content-Type:"application/json"
 ### Header 最佳实践
 
 1. **白名单模式**：建议仅允许以 `X-Custom-` 或 `X-Enrich-` 为前缀的自定义 Header
-2. **长度限制**：单个 Header 的 Key 或 Value 长度不应超过 1024 字节
+2. **长度限制**：单个 Header 的 Key 长度不应超过 1024 字节, Value 长度不应超过 4096 字节
 3. **格式校验**：Header 的 Value 严禁包含换行符（`\r`、`\n`），以防止 Header 注入攻击
 
 ## 五、最佳实践