Unable to send data from udp port inlogstash to telegraf's socket listener(udp), neither able to see any error in debug logs

[sgorai (Sanchita)]

I am working on a requirement to send data from logstash through udp to telegraf and then to influxdb. I am not seeing any errors in the logs but neither my data is reaching there, i tried sending to both ipv6 and ipv4 udp ports, using logstash 7, but nothing seems to work and i am not even seeing any relevant logs in the debug mode for udp, hence looking for some assistance on debugging the same.
I tried using codec json, rubydebug, still no luck in gettting any error msg or data going. I m trying to send a json message there.

Pls find below a sample json-

{"@timestamp":"2019-06-05T00:04:02.174-04:00","appname":"cust_store","apptype":"play","appversion":"1.0","appenvironment":"ta5","port":"9910","logger": "com.vzw.session.handler.VzActionCreator","level": "INFO", "sessionId":"POS-APP-d172eqef-0c24-41b9-82f4-188717dfc5a2{s4}","loggedInUserId":"9415863141","mtn":"","roundTripTime":"5000032","statusCode":"200"}

My logstash config looks like this-

##################################################

input {
 #  stdin { codec => "json"}
 file {
#           codec => json
       path => "/app/logstash-7.1.1/qa-logs/*.log"
       start_position => "beginning"
       sincedb_path => "/dev/null"  # for unix
 }
}
  filter{

#    json {
#       source => "message"
#       #source => "[response_json]"
#    }

 mutate {
     convert => ["roundTripTime","integer"]
 }

 prune {
#    interpolate => true
    whitelist_names => ["appname","appenvironment","sessionId","roundTripTime","tags"]
 }


#           if [response_json] {
              mutate {
                    add_field => { "data_tag1" => "appname=%{appname}" }
                    add_field => { "data_tag2" => "appenvironment=%{appenvironment}" }
                    add_field => { "data_tag3" => "sessionId=%{sessionId}" }
             }
#          }

}

output{

#    stdout {
#          codec => "rubydebug"
#          codec => "json"
#       }

udp {

            host => "10.119.4.76"
            port => 8092
         #   codec => "rubydebug"
            codec => "json"

}


## when i send directly to influxdb, it works, but that is not my goal, want to send through telegraf(to apply aggregations and time series data)
#    influxdb {
#        data_points => {
#              "appname" => "%{appname}"
#              "appenvironment" => "%{appenvironment}"
#              "sessionId" => "%{sessionId}"
#              "roundTripTime" => "%{roundTripTime}"
#              "statusCode" => "%{statusCode}"
#              "port" => "%{port}"
#        }
#        send_as_tags => ["appname","appenvironment","sessionId"]
#       coerce_values => {
#      "roundTripTime" => "integer"
#     "statusCode" => "integer"
#    "port" => "integer"
# }
#         measurement => "oneDigital"
#         host => "xx.xx.xx.xx" # some ip
#         port => 8086
#         ssl => "true"
#         db => "somemetrics"
#         user => "smuser"
#         password => "smpwd"
#   }


}

##################################################