Debug Metrics in Swarm

Check the application's processor service and the statsd service are both in the same overlay network.
```
docker service inspect processor
```
Then look under the `Networks` section to see all the networks each service is attached to.

If both services are in the same network, check for DNS or network issues.
```
docker exec -it processor bash
apt-get update
apt-get install dnsutils curl

dig statsd_replicated
# should show the service's virtual IP address (load balancer IP)

curl -k -v https://statsd:2443
# should show the connection to graphite could be made
```

The command to check for all metrics reported to graphite is `curl -k https://statsd:2443/metrics/index.json`.
This could be run from processor since it had a shell.

Sometimes your application containers don't have a shell, but you can run an arbitrary container attached to the network you're debugging.
```
docker service create --name debug --network statsd debian:9 bash -c 'sleep infintiy'
```
Then do `docker ps` find the container, exec in, and install whatever utils you need, like shown above with processor.