- Update version of elasticsearch-curator.
- Update version of Alpine linux.
- Use supersonic instead of crond.

- Update Python to 3.7.
- Update Curator to 5.5.4.
- Fix crontab issue.

- Elasticsearch, Logstash and Kibana (with LogTrail installed and index
patterns configured).
- Metricbeat for host and containers and setup of dashboards and indices.
- Heartbeat of various services and setup of dashboards and indices.
- Curator for both days and percent of free disk space.