🔊 Improve Logging: move to slog and add trace level (#276)

* Add Warn and Trace loglevels

* Move to slog

* fixes

* missing test file

* Fix tests

* Add wrapper with trace

* fix

* fix lint

* LINT

* LINT

* 🍱 Use only 4 level of logs

* fix after merge

* 🍱 fix lint

* 🍱 fix lint + remove trace logger from tests

* 🍱 fix tests

* 🍱 fix lint

* 🍱 try to fix test

* 🍱 Fix tests

* 🍱 fix README + adjust logs

---------

Co-authored-by: maxlerebourg <maxlerebourg@gmail.com>

README.md

@@ -329,8 +329,12 @@ make run
   - Enable the plugin
 - LogLevel
   - string
-  - default: `INFO`, expected values are: `INFO`, `DEBUG`, `ERROR`
+  - default: `INFO`, expected values are: `DEBUG`, `INFO`, `WARN`, `ERROR`
   - Log are written to `stdout` / `stderr` or file if LogFilePath is provided
+- LogFormat
+  - string
+  - default: `common`, expected values are: `common`, `json`
+  - Log format: `common` for traditional text logs, `json` for structured JSON logs
 - LogFilePath
   - string
   - default: ""
@@ -590,6 +594,7 @@ http:
         bouncer:
           enabled: false
           logLevel: DEBUG
+          logFormat: common
           LogFilePath: ""
           updateIntervalSeconds: 60
           updateMaxFailure: 0