Add notification queue metrics (#16026)

internal/event/target/kafka.go

@@ -33,7 +33,7 @@ import (
 	"github.com/minio/minio/internal/logger"
 	xnet "github.com/minio/pkg/net"
 
-	sarama "github.com/Shopify/sarama"
+	"github.com/Shopify/sarama"
 	saramatls "github.com/Shopify/sarama/tools/tls"
 )
 
@@ -139,6 +139,11 @@ func (target *KafkaTarget) ID() event.TargetID {
 	return target.id
 }
 
+// Store returns any underlying store if set.
+func (target *KafkaTarget) Store() event.TargetStore {
+	return target.store
+}
+
 // IsActive - Return true if target is up and active
 func (target *KafkaTarget) IsActive() (bool, error) {
 	if err := target.init(); err != nil {