Allow configuration of amqp exchange type, durability, and arguments

plugins/inputs/amqp_consumer/README.md

@@ -17,23 +17,36 @@ The following defaults are known to work with RabbitMQ:
 [[inputs.amqp_consumer]]
   ## AMQP url
   url = "amqp://localhost:5672/influxdb"
-  ## AMQP exchange
+
+  ## Exchange to declare and consume from.
   exchange = "telegraf"
-  ## Exchange passive mode
-  exchange_passive = false
+
+  ## Exchange type; common types are "direct", "fanout", "topic", "header", "x-consistent-hash".
+  # exchange_type = "topic"
+
+  ## If true, exchange will be passively declared.
+  # exchange_passive = false
+
+  ## Exchange durability can be either "transient" or "durable".
+  # exchange_durability = "durable"
+
+  ## Additional exchange arguments.
+  # exchange_args = { }
+  # exchange_args = {"hash_propery" = "timestamp"}
+
   ## AMQP queue name
   queue = "telegraf"
   ## Binding Key
   binding_key = "#"
 
-  ## Controls how many messages the server will try to keep on the network
-  ## for consumers before receiving delivery acks.
-  #prefetch_count = 50
+  ## Maximum number of messages server should give to the worker.
+  prefetch_count = 50
 
-  ## Auth method. PLAIN and EXTERNAL are supported.
+  ## Auth method. PLAIN and EXTERNAL are supported
   ## Using EXTERNAL requires enabling the rabbitmq_auth_mechanism_ssl plugin as
   ## described here: https://www.rabbitmq.com/plugins.html
   # auth_method = "PLAIN"
+
   ## Optional TLS Config
   # tls_ca = "/etc/telegraf/ca.pem"
   # tls_cert = "/etc/telegraf/cert.pem"