docs(logger): add logger.disableConsoleAfterReady to docs (#3384)

* docs: update docs of logger.disableConsoleAfterReady

docs/source/en/core/logger.md

@@ -168,7 +168,9 @@ exports.logger = {
 
 ### In terminal
 
-By default, Egg will only print out `INFO`, `WARN` and `ERROR` in terminal. `logger.consoleLevel`(default: `INFO`) is defined as the logger level in terminal. Similarly, it can be changed as following:
+By default, Egg will only print out `INFO`, `WARN` and `ERROR` in terminal. (Notice: It only works on `local` and `unittest` env)
+
+- `logger.consoleLevel`: (default: `INFO`) Being defined as the logger level in terminal. Similarly, it can be changed as following:
 
 Print logs in all levels:
 
@@ -188,6 +190,15 @@ exports.logger = {
 };
 ```
 
+- Base on performance considerations, console logger will be disabled after app ready at prod mode. however, you can enable it by config. (**Not Recommended**)
+
+```js
+// config/config.${env}.js
+exports.logger = {
+  disableConsoleAfterReady: false,
+};
+```
+
 ## Create your logger
 
 ### Customized

docs/source/zh-cn/core/logger.md

@@ -177,7 +177,7 @@ exports.logger = {
 
 ### 终端日志级别
 
-默认只会输出 `INFO` 及以上（`WARN` 和 `ERROR`）的日志到终端中。
+默认只会输出 `INFO` 及以上（`WARN` 和 `ERROR`）的日志到终端中。（注意：这些日志默认只在 local 和 unittest 环境下会打印到终端）
 
 - `logger.consoleLevel`: 输出到终端日志的级别，默认为 `INFO`
 
@@ -201,6 +201,15 @@ exports.logger = {
 };
 ```
 
+- 基于性能的考虑，在正式环境下，默认会关闭终端日志输出。如有需要，你可以通过下面的配置开启。（**不推荐**）
+
+```js
+// config/config.${env}.js
+exports.logger = {
+  disableConsoleAfterReady: false,
+};
+```
+
 ## 自定义日志
 
 ### 增加自定义日志