Structured logging (#8673)

* Implementing structured logging

* Changes to en.json to allow refactor to run.

* Fixing global logger

* Structured logger initalization.

* Add caller.

* Do some log redirection.

* Auto refactor

* Cleaning up l4g reference and removing dependancy.

* Removing junk.

* Copyright headers.

* Fixing tests

* Revert "Changes to en.json to allow refactor to run."

This reverts commit fd8249e99bcad0231e6ea65cd77c32aae9a54026.

* Fixing some auto refactor strangeness and typo.

* Making keys more human readable.

app/status.go

@@ -4,8 +4,9 @@
 package app
 
 import (
-	l4g "github.com/alecthomas/log4go"
+	"fmt"
 
+	"github.com/mattermost/mattermost-server/mlog"
 	"github.com/mattermost/mattermost-server/model"
 	"github.com/mattermost/mattermost-server/store"
 	"github.com/mattermost/mattermost-server/utils"
@@ -208,7 +209,7 @@ func (a *App) SetStatusOnline(userId string, sessionId string, manual bool) {
 		}
 
 		if result := <-schan; result.Err != nil {
-			l4g.Error(utils.T("api.status.save_status.error"), userId, result.Err)
+			mlog.Error(fmt.Sprintf("Failed to save status for user_id=%v, err=%v", userId, result.Err), mlog.String("user_id", userId))
 		}
 	}
 
@@ -292,7 +293,7 @@ func (a *App) SaveAndBroadcastStatus(status *model.Status) *model.AppError {
 	a.AddStatusCache(status)
 
 	if result := <-a.Srv.Store.Status().SaveOrUpdate(status); result.Err != nil {
-		l4g.Error(utils.T("api.status.save_status.error"), status.UserId, result.Err)
+		mlog.Error(fmt.Sprintf("Failed to save status for user_id=%v, err=%v", status.UserId, result.Err))
 	}
 
 	event := model.NewWebSocketEvent(model.WEBSOCKET_EVENT_STATUS_CHANGE, "", "", status.UserId, nil)
@@ -320,7 +321,7 @@ func (a *App) SetStatusOutOfOffice(userId string) {
 	a.AddStatusCache(status)
 
 	if result := <-a.Srv.Store.Status().SaveOrUpdate(status); result.Err != nil {
-		l4g.Error(utils.T("api.status.save_status.error"), userId, result.Err)
+		mlog.Error(fmt.Sprintf("Failed to save status for user_id=%v, err=%v", userId, result.Err), mlog.String("user_id", userId))
 	}
 
 	event := model.NewWebSocketEvent(model.WEBSOCKET_EVENT_STATUS_CHANGE, "", "", status.UserId, nil)