Added Burrow

- See: https://github.com/linkedin/Burrow

Added `seglo/kafka-lag-exporter`

- See: https://github.com/seglo/kafka-lag-exporter#monitoring-with-grafana

Fixed the problem with the missing data in the Grfana dashboard

- The naming (and selection) of the broker-metrics that was defined in the
  configurtaion of the jmx-exporter did not match the naming in the
  predefined dashboard.
- Replaced the configuration for the jmx-exporter with the one that was
  defined in the same example, as the dashboard.

Data!

Enabled the default metrics in the Bitnami image for Zookeeper

See: https://hub.docker.com/r/bitnami/zookeeper/

Added Zookeeper

Config from: https://github.com/confluentinc/jmx-monitoring-stacks/blob/7.2-post/shared-assets/jmx-exporter/zookeeper.yml
See: https://www.confluent.io/blog/monitor-kafka-clusters-with-prometheus-g

Added Grafana

Dashboard from: https://github.com/confluentinc/jmx-monitoring-stacks
See: https://www.confluent.io/blog/monitor-kafka-clusters-with-prometheus-grafana-and-confluent/

Added Prometheus

Added `prometheus_jmx_exporter` as java-agent in the Kafka brokers

Switched from KRAFT to Zookeeper -- works :)

Added `danielqsj/kafka-exporter` -- does not work :/

Empty setup for Docker Compose as basis for the monitoring examples