Help request logging to Loki to view in Grafana

[simonreye-4tel]

I've basically copied the logback example configuration file to send Java logs to fluentd. I then want to forward the logs on to Loki. My fluentd configuration is:

<source>
  @type forward
  port 24224
</source>

<match **>
  @type loki
  url "http://loki:3100"
  extra_labels {"env":"dev"}
  <buffer>
    flush_interval 10s
    flush_at_shutdown true
  </buffer>
  buffer_chunk_limit 1m
</match>

This sort of works but the only label that is visible for querying in Grafana is "env". I would like to see level, logger, time etc. Can someone help me out?