feat(inputs.amqp_consumer): Allow specification of queue arguments (#16141)

Co-authored-by: Robin Lucbernet <rlucbernet@maltem.com>

plugins/inputs/amqp_consumer/README.md

@@ -105,6 +105,10 @@ to use them.
   # queue_consume_arguments = { }
   # queue_consume_arguments = {"x-stream-offset" = "first"}
 
+  ## Additional queue arguments.
+  # queue_arguments = { }
+  # queue_arguments = {"x-max-length" = 100}
+
   ## A binding between the exchange and queue using this binding key is
   ## created.  If unset, no binding is created.
   binding_key = "#"

plugins/inputs/amqp_consumer/amqp_consumer.go

@@ -44,6 +44,7 @@ type AMQPConsumer struct {
 	Queue                  string            `toml:"queue"`
 	QueueDurability        string            `toml:"queue_durability"`
 	QueuePassive           bool              `toml:"queue_passive"`
+	QueueArguments         map[string]int    `toml:"queue_arguments"`
 	QueueConsumeArguments  map[string]string `toml:"queue_consume_arguments"`
 	BindingKey             string            `toml:"binding_key"`
 	PrefetchCount          int               `toml:"prefetch_count"`
@@ -369,6 +370,11 @@ func (a *AMQPConsumer) declareQueue(channel *amqp.Channel) (*amqp.Queue, error)
 		queueDurable = false
 	}
 
+	queueArgs := make(amqp.Table, len(a.QueueArguments))
+	for k, v := range a.QueueArguments {
+		queueArgs[k] = v
+	}
+
 	if a.QueuePassive {
 		queue, err = channel.QueueDeclarePassive(
 			a.Queue,      // queue
@@ -376,7 +382,7 @@ func (a *AMQPConsumer) declareQueue(channel *amqp.Channel) (*amqp.Queue, error)
 			false,        // delete when unused
 			false,        // exclusive
 			false,        // no-wait
-			nil,          // arguments
+			queueArgs,    // arguments
 		)
 	} else {
 		queue, err = channel.QueueDeclare(
@@ -385,7 +391,7 @@ func (a *AMQPConsumer) declareQueue(channel *amqp.Channel) (*amqp.Queue, error)
 			false,        // delete when unused
 			false,        // exclusive
 			false,        // no-wait
-			nil,          // arguments
+			queueArgs,    // arguments
 		)
 	}
 	if err != nil {

plugins/inputs/amqp_consumer/sample.conf

@@ -38,6 +38,10 @@
   # queue_consume_arguments = { }
   # queue_consume_arguments = {"x-stream-offset" = "first"}
 
+  ## Additional queue arguments.
+  # queue_arguments = { }
+  # queue_arguments = {"x-max-length" = 100}
+
   ## A binding between the exchange and queue using this binding key is
   ## created.  If unset, no binding is created.
   binding_key = "#"