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/webhook.go

@@ -4,13 +4,14 @@
 package app
 
 import (
+	"fmt"
 	"io"
 	"net/http"
 	"regexp"
 	"strings"
 	"unicode/utf8"
 
-	l4g "github.com/alecthomas/log4go"
+	"github.com/mattermost/mattermost-server/mlog"
 	"github.com/mattermost/mattermost-server/model"
 	"github.com/mattermost/mattermost-server/store"
 	"github.com/mattermost/mattermost-server/utils"
@@ -107,7 +108,7 @@ func (a *App) TriggerWebhook(payload *model.OutgoingWebhookPayload, hook *model.
 				req.Header.Set("Content-Type", contentType)
 				req.Header.Set("Accept", "application/json")
 				if resp, err := a.HTTPClient(false).Do(req); err != nil {
-					l4g.Error(utils.T("api.post.handle_webhook_events_and_forget.event_post.error"), err.Error())
+					mlog.Error(fmt.Sprintf("Event POST failed, err=%s", err.Error()))
 				} else {
 					defer consumeAndClose(resp)
 
@@ -134,7 +135,7 @@ func (a *App) TriggerWebhook(payload *model.OutgoingWebhookPayload, hook *model.
 						}
 
 						if _, err := a.CreateWebhookPost(hook.CreatorId, channel, text, webhookResp.Username, webhookResp.IconURL, webhookResp.Props, webhookResp.Type, postRootId); err != nil {
-							l4g.Error(utils.T("api.post.handle_webhook_events_and_forget.create_post.error"), err)
+							mlog.Error(fmt.Sprintf("Failed to create response post, err=%v", err))
 						}
 					}
 				}