Merge branch 'eventhub' of https://github.com/R290/telegraf into even…

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plugins/inputs/eventhub/README.md

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+# Azure Event Hubs input plugin
+
+This plugin provides a consumer for use with Azure Event Hubs and Azure IoT Hub. The implementation is in essence a wrapper for [Microsoft Azure Event Hubs Client for Golang](https://github.com/Azure/azure-event-hubs-go).
+
+## Configuration
+
+```toml
+[[inputs.eventhub]]
+  ## The default behavior is to create a new Event Hub client from enviroment variables.
+  ## This requires one of the following sets of enviroment variables to be set:
+  ##
+  ## 1) Expected Environment Variables:
+  ##    - "EVENTHUB_NAMESPACE"
+  ##    - "EVENTHUB_NAME"
+  ##    - "EVENTHUB_CONNECTION_STRING"
+  ##
+  ## 2) Expected Environment Variables:
+  ##    - "EVENTHUB_NAMESPACE"
+  ##    - "EVENTHUB_NAME"
+  ##    - "EVENTHUB_KEY_NAME"
+  ##    - "EVENTHUB_KEY_VALUE"
+
+  ## Uncommenting the option below will create an Event Hub client based solely on the connection string.
+  ## This can either be the associated envirnoment variable or hardcoded directly.
+  # connection_string = "$EVENTHUB_CONNECTION_STRING"
+
+  ## Set persistence directory to a valid folder to use a file persister instead of an in-memory persister
+  # persistence_dir = ""
+
+  ## Change the default consumer group
+  # consumer_group = ""
+
+  ## By default the event hub receives all messages present on the broker.
+  ## Alternative modes can be set below. The timestamp should be in RFC3339 format.
+  # from_timestamp = ""
+  # starting_offset = ""
+  # latest = true
+
+  ## Set a custom prefetch count for the receiver(s)
+  # prefetch_count = 1000
+
+  ## Add an epoch to the receiver(s)
+  # epoch = 0
+
+  ## Change to set a custom user agent, "telegraf" is used by default
+  # user_agent = "telegraf"
+
+  ## To consume from a specific partition, set the partition_ids option.
+  ## An empty array will result in receiving from all partitions.
+  # partition_ids = ["0","1"]
+
+  ## Max undelivered messages
+  # max_undelivered_messages = 1000
+
+  ## Data format to consume.
+  ## Each data format has its own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
+  data_format = "influx"
+```
+## Testing
+
+The main focus for development of this plugin is Azure IoT hub:
+
+1. Create an Azure IoT Hub by following any of the guides provided here: https://docs.microsoft.com/en-us/azure/iot-hub/
+2. Create a device, for example a [simulated Raspberry Pi](https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-raspberry-pi-web-simulator-get-started)
+3. The connection string needed for the plugin is located under *Shared access policies*, both the *iothubowner* and *service* policies should work