Support for Kafka version in the config (#9001)

Add a field for the Kafka version in the config. The user can explicitly 
set the version of the Kafka cluster.

Fixes #8768

cmd/config/notify/help.go

@@ -213,6 +213,12 @@ var (
 			Optional:    true,
 			Type:        "number",
 		},
+		config.HelpKV{
+			Key:         target.KafkaVersion,
+			Description: "specify the version of the Kafka cluster",
+			Optional:    true,
+			Type:        "string",
+		},
 		config.HelpKV{
 			Key:         config.Comment,
 			Description: config.DefaultComment,

cmd/config/notify/parse.go

@@ -384,6 +384,10 @@ var (
 			Key:   target.KafkaQueueDir,
 			Value: "",
 		},
+		config.KV{
+			Key:   target.KafkaVersion,
+			Value: "",
+		},
 	}
 )
 
@@ -451,12 +455,18 @@ func GetNotifyKafka(kafkaKVS map[string]config.KVS) (map[string]target.KafkaArgs
 			queueDirEnv = queueDirEnv + config.Default + k
 		}
 
+		versionEnv := target.EnvKafkaVersion
+		if k != config.Default {
+			versionEnv = versionEnv + config.Default + k
+		}
+
 		kafkaArgs := target.KafkaArgs{
 			Enable:     enabled,
 			Brokers:    brokers,
 			Topic:      env.Get(topicEnv, kv.Get(target.KafkaTopic)),
 			QueueDir:   env.Get(queueDirEnv, kv.Get(target.KafkaQueueDir)),
 			QueueLimit: queueLimit,
+			Version:    env.Get(versionEnv, kv.Get(target.KafkaVersion)),
 		}
 
 		tlsEnableEnv := target.EnvKafkaTLS