Logstash error for datadog output plugin

I am trying to submit some events to datadog from logstash using datadog output plugin. Below is my logstash config:-

input {
 stdin{ 
 type => "stdin-type" 
 codec => json {}
 }
}

output { 
  if "_jsonparsefailure" in [tags] {
    stdout { codec => rubydebug }
    datadog {
      api_key => "xxxxxx"      
    }
  }  
}

On typing some non-json input (let's say hello) in STDIN of logstash I am getting the below output and not seeing any events in datadog.

Logstash startup completed
hello
{
       "message" => "hello",
          "tags" => [
        [0] "_jsonparsefailure"
    ],
      "@version" => "1",
    "@timestamp" => "2015-09-05T16:55:41.652Z",
          "type" => "stdin-type",
          "host" => "jabong-1383"
}
Unhandled exception {:request=>"#<Net::HTTP::Post POST>", :response=>"#<Net::HTTPAccepted 202 Accepted readbody=true>", :exception=>"RuntimeError", :level=>:warn}

Environment

  • Logstash Version 1.5.2

Can someone let me know what I am doing wrong?