Initialize map for start times and fix goimports

Author: bilaljaved

extension/prometheus/prometheus.go

@@ -50,6 +50,9 @@ func NewMetrics() *Metrics {
 			},
 			[]string{"success", "retry"},
 		),
+
+		// notificationStartTimes holds start time for notification queue and processing
+		notificationStartTimes: make(map[string]time.Time),
 	}
 }
 

metrics_nop.go

@@ -5,7 +5,7 @@ var NopMetrics Metrics = &nopMetrics{}
 
 type nopMetrics struct{}
 
-func (nm *nopMetrics) ReceivedNotification(isNotification bool)                             {}
+func (nm *nopMetrics) ReceivedNotification(isNotification bool)             {}
 func (nm *nopMetrics) QueueNotification(notification interface{})           {}
 func (nm *nopMetrics) StartNotificationProcessing(notification interface{}) {}
 func (nm *nopMetrics) FinishNotificationProcessing(notification interface{}, success bool, retry bool) {

test/internal/suite.go

@@ -1,14 +1,15 @@
 package internal
 
 import (
-	"github.com/hellofresh/goengine/extension/prometheus"
 	"testing"
 
-	"github.com/hellofresh/goengine"
-	logWrapper "github.com/hellofresh/goengine/extension/logrus"
 	"github.com/sirupsen/logrus"
 	"github.com/sirupsen/logrus/hooks/test"
 	"github.com/stretchr/testify/suite"
+
+	"github.com/hellofresh/goengine"
+	logWrapper "github.com/hellofresh/goengine/extension/logrus"
+	"github.com/hellofresh/goengine/extension/prometheus"
 )
 
 // Suite is an extension of github.com/stretchr/testify/suite.Suite