remove einterface gets (#7455)

app/webhook.go

@@ -11,7 +11,6 @@ import (
 	"unicode/utf8"
 
 	l4g "github.com/alecthomas/log4go"
-	"github.com/mattermost/mattermost-server/einterfaces"
 	"github.com/mattermost/mattermost-server/model"
 	"github.com/mattermost/mattermost-server/store"
 	"github.com/mattermost/mattermost-server/utils"
@@ -126,7 +125,7 @@ func (a *App) CreateWebhookPost(userId string, channel *model.Channel, text, ove
 	post := &model.Post{UserId: userId, ChannelId: channel.Id, Message: text, Type: postType}
 	post.AddProp("from_webhook", "true")
 
-	if metrics := einterfaces.GetMetricsInterface(); metrics != nil {
+	if metrics := a.Metrics; metrics != nil {
 		metrics.IncrementWebhookPost()
 	}