UDF - keepalive timedout

Tried a basic process UDF definition as per the tutorial. However, it seems to get stuck during the info() process. Why is that? Working with kapacitor:1.3.3-alpine as a docker container.

[srv] 2017/09/26 08:17:03 D! applying configuration overrides for talk
[srv] 2017/09/26 08:17:03 D! opening service: *servicetest.Service
[srv] 2017/09/26 08:17:03 D! opened service: *servicetest.Service
[srv] 2017/09/26 08:17:03 D! opening service: *udf.Service
[udf] 2017/09/26 08:17:03 I!P In Data init()
[udf] 2017/09/26 08:17:03 I!P Starting agent for DataHandler
[udf] 2017/09/26 08:17:03 I!P In Data info()
[udf] 2017/09/26 08:17:13 E! keepalive timedout, last keepalive received was: 2017-09-26 08:17:03.690373825 +0000 UTC
[udf] 2017/09/26 08:17:13 I!P Agent finished
[httpd] 2017/09/26 08:17:13 I! Closed HTTP service
[edge:task_master:main|write_points->stream] 2017/09/26 08:17:13 D! closing c: 0 e: 0
[srv] 2017/09/26 08:17:13 D! closing service: *httpd.Service
[httpd] 2017/09/26 08:17:13 I! Closed HTTP service
[srv] 2017/09/26 08:17:13 D! closed service: *httpd.Service
[srv] 2017/09/26 08:17:13 D! closing service: *triton.Service
[srv] 2017/09/26 08:17:13 D! closed service: *triton.Service
[srv] 2017/09/26 08:17:13 D! closing service: *static_discovery.Service
[srv] 2017/09/26 08:17:13 D! closed service: *static_discovery.Service
[srv] 2017/09/26 08:17:13 D! closing service: *serverset.Service
[srv] 2017/09/26 08:17:13 D! closed service: *serverset.Service
[srv] 2017/09/26 08:17:13 D! closing service: *nerve.Service
[srv] 2017/09/26 08:17:13 D! closed service: *nerve.Service
[srv] 2017/09/26 08:17:13 D! closing service: *marathon.Service
[srv] 2017/09/26 08:17:13 D! closed service: *marathon.Service
[srv] 2017/09/26 08:17:13 D! closing service: *gce.Service
[srv] 2017/09/26 08:17:13 D! closed service: *gce.Service
[srv] 2017/09/26 08:17:13 D! closing service: *file_discovery.Service
[srv] 2017/09/26 08:17:13 D! closed service: *file_discovery.Service
[srv] 2017/09/26 08:17:13 D! closing service: *ec2.Service
[srv] 2017/09/26 08:17:13 D! closed service: *ec2.Service
[srv] 2017/09/26 08:17:13 D! closing service: *dns.Service
[srv] 2017/09/26 08:17:13 D! closed service: *dns.Service
[srv] 2017/09/26 08:17:13 D! closing service: *consul.Service
[srv] 2017/09/26 08:17:13 D! closed service: *consul.Service
[srv] 2017/09/26 08:17:13 D! closing service: *azure.Service
[srv] 2017/09/26 08:17:13 D! closed service: *azure.Service
[srv] 2017/09/26 08:17:13 D! closing service: *k8s.Service
[srv] 2017/09/26 08:17:13 D! closed service: *k8s.Service
[srv] 2017/09/26 08:17:13 D! closing service: *scraper.Service
[srv] 2017/09/26 08:17:13 D! closed service: *scraper.Service
[srv] 2017/09/26 08:17:13 D! closing service: *reporting.Service
[srv] 2017/09/26 08:17:13 D! closed service: *reporting.Service
[srv] 2017/09/26 08:17:13 D! closing service: *stats.Service
[srv] 2017/09/26 08:17:13 D! closed service: *stats.Service
[srv] 2017/09/26 08:17:13 D! closing service: *replay.Service
[srv] 2017/09/26 08:17:13 D! closed service: *replay.Service
[srv] 2017/09/26 08:17:13 D! closing service: *task_store.Service
[srv] 2017/09/26 08:17:13 D! closed service: *task_store.Service
[srv] 2017/09/26 08:17:13 D! closing service: *alert.Service
[srv] 2017/09/26 08:17:13 D! closed service: *alert.Service
[srv] 2017/09/26 08:17:13 D! closing service: *victorops.Service
[srv] 2017/09/26 08:17:13 D! closed service: *victorops.Service
[srv] 2017/09/26 08:17:13 D! closing service: *talk.Service
[srv] 2017/09/26 08:17:13 D! closed service: *talk.Service
[srv] 2017/09/26 08:17:13 D! closing service: *sensu.Service
[srv] 2017/09/26 08:17:13 D! closed service: *sensu.Service
[srv] 2017/09/26 08:17:13 D! closing service: *snmptrap.Service
[srv] 2017/09/26 08:17:13 D! closed service: *snmptrap.Service
[srv] 2017/09/26 08:17:13 D! closing service: *slack.Service
[srv] 2017/09/26 08:17:13 D! closed service: *slack.Service
[srv] 2017/09/26 08:17:13 D! closing service: *telegram.Service
[srv] 2017/09/26 08:17:13 D! closed service: *telegram.Service
[srv] 2017/09/26 08:17:13 D! closing service: *smtp.Service
[srv] 2017/09/26 08:17:13 D! closed service: *smtp.Service
[srv] 2017/09/26 08:17:13 D! closing service: *httppost.Service
[srv] 2017/09/26 08:17:13 D! closed service: *httppost.Service
[srv] 2017/09/26 08:17:13 D! closing service: *pushover.Service
[srv] 2017/09/26 08:17:13 D! closed service: *pushover.Service
[srv] 2017/09/26 08:17:13 D! closing service: *pagerduty.Service
[srv] 2017/09/26 08:17:13 D! closed service: *pagerduty.Service
[srv] 2017/09/26 08:17:13 D! closing service: *opsgenie.Service
[srv] 2017/09/26 08:17:13 D! closed service: *opsgenie.Service
[srv] 2017/09/26 08:17:13 D! closing service: *hipchat.Service
[srv] 2017/09/26 08:17:13 D! closed service: *hipchat.Service
[srv] 2017/09/26 08:17:13 D! closing service: *alerta.Service
[srv] 2017/09/26 08:17:13 D! closed service: *alerta.Service
[srv] 2017/09/26 08:17:13 D! closing service: *influxdb.Service
[srv] 2017/09/26 08:17:13 D! closed service: *influxdb.Service
[srv] 2017/09/26 08:17:13 D! closing service: *deadman.Service
[srv] 2017/09/26 08:17:13 D! closed service: *deadman.Service
[srv] 2017/09/26 08:17:13 D! closing service: *udf.Service
[srv] 2017/09/26 08:17:13 D! closed service: *udf.Service
[srv] 2017/09/26 08:17:13 D! closing service: *servicetest.Service
[srv] 2017/09/26 08:17:13 D! closed service: *servicetest.Service
[srv] 2017/09/26 08:17:13 D! closing service: *config.Service
[srv] 2017/09/26 08:17:13 D! closed service: *config.Service
[srv] 2017/09/26 08:17:13 D! closing service: *noauth.Service
[srv] 2017/09/26 08:17:13 D! closed service: *noauth.Service
[srv] 2017/09/26 08:17:13 D! closing service: *storage.Service
[srv] 2017/09/26 08:17:13 D! closed service: *storage.Service
[task_master:main] 2017/09/26 08:17:13 I! closed
[run] 2017/09/26 08:17:13 E! open server: open service *udf.Service: failed to load process info for “Data”: keepalive timedout, last keepalive received was: 2017-09-26 08:17:03.690373825 +0000 UTC
[run] 2017/09/26 08:17:14 I! Kapacitor starting, version 1.3.3, branch HEAD, commit ce586f35e89e75a1779e2b493caba15d66295a15
[run] 2017/09/26 08:17:14 I! Go version go1.7.5
[srv] 2017/09/26 08:17:14 I! Kapacitor hostname: d43b38e3b1f4
[srv] 2017/09/26 08:17:14 I! ClusterID: f4cf8bf0-d858-44bd-8c7d-e8f31379837f ServerID: fe2ffd81-fed0-4d5f-a7e9-5da88a3f2c9b
[task_master:main] 2017/09/26 08:17:14 I! opened

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