Correct config for kubernetes

[matt-dalton]

I am trying to run this plugin on Kubernetes. Having followed the dogstatsd setup instructions here, I've then added this to my uwsgi_config.ini:

enable-metrics = true
plugin = dogstatsd
stats-push=dogstatsd:$(DD_AGENT_HOST):8125,uwsgi
print = Pushing uwsgi stats to dogstatsd on $(DD_AGENT_HOST):8125
stats-pusher-default-freq=10
dogstatsd-extra-tags = env:$(AWS_ENVIRONMENT),service:uwsgi

where DD_AGENT_HOST is defined in my deployment.yaml as:

- name: DD_AGENT_HOST
   valueFrom:
       fieldRef:
            fieldPath: status.hostIP

This runs successfully, in the sense that this appears in the logs:

    Pushing uwsgi stats to dogstatsd on 172.19.30.101:8125
    ...
    initialized 54 metrics

But nothing appears in datadog. I also don't see any errors. Is there anything obvious I've missed here? Or anything I can do to debug the config?