MM-43077 Allow inline JSON in config.json for advanced logging config (#23324)

* add AdvancedLoggingJSON to LogSettings and deprecate AdvancedLoggingConfig
* allow embedded JSON in config for advanced logging.

server/channels/app/platform/config.go

@@ -19,6 +19,7 @@ import (
 
 	"github.com/mattermost/mattermost-server/server/public/model"
 	"github.com/mattermost/mattermost-server/server/public/shared/mlog"
+	"github.com/mattermost/mattermost-server/server/public/utils"
 	"github.com/mattermost/mattermost-server/server/v8/channels/product"
 	"github.com/mattermost/mattermost-server/server/v8/channels/store"
 	"github.com/mattermost/mattermost-server/server/v8/config"
@@ -120,14 +121,14 @@ func (ps *PlatformService) ConfigureLogger(name string, logger *mlog.Logger, log
 	// file is loaded.  If no valid E20 license exists then advanced logging will be
 	// shutdown once license is loaded/checked.
 	var err error
-	dsn := *logSettings.AdvancedLoggingConfig
 	var logConfigSrc config.LogConfigSrc
-	if dsn != "" {
+	dsn := logSettings.GetAdvancedLoggingConfig()
+	if !utils.IsEmptyJSON(dsn) {
 		logConfigSrc, err = config.NewLogConfigSrc(dsn, ps.configStore)
 		if err != nil {
 			return fmt.Errorf("invalid config source for %s, %w", name, err)
 		}
-		ps.logger.Info("Loaded configuration for "+name, mlog.String("source", dsn))
+		ps.logger.Info("Loaded configuration for "+name, mlog.String("source", string(dsn)))
 	}
 
 	cfg, err := config.MloggerConfigFromLoggerConfig(logSettings, logConfigSrc, getPath)