Added features:
Monitoring Hub on docker
- collectd + Graphite for infra metrics collection
- Grafana + grafana renderer for visualization
- Zabbix server, postgresql storage and web UI
- nginx/certbot letsencrypt SSL cert autorenewal
https://github.com/reefactor/org.backbone/tree/master/roles/monitoring_hub/files/monitoring_hub
TCP tunnel with docker and socat
- trivial command-line: socat-tunnel/docker-run-socat.sh
- convinient compose config: socat-tunnel/docker-compose.yml
Minor updates
- nextcloud 20.0.1
- gitlab CI fixes
- ssh users role with different access level