* Add systemd_exporter Ansible role and Prometheus scrape config
- Create systemd_exporter role (download binary, create user, deploy service)
- Add scrape job for london-b:9558 and copenhagen-a:9558
- Add systemd_exporter_hosts inventory group
- Add stage 3b to deploy.yml
- Map role to deploy-on-merge scope
Closes PESO-120
* Fix line length lint violations in systemd_exporter tasks
* Fix var-naming lint: use systemd_exporter_ prefix for role variables
Docker is masked on copenhagen-a and Minecraft is no longer managed
via Docker Compose. Removes:
- copenhagen-a from [docker_hosts] inventory group
- docker_services var from copenhagen-a host_vars
- docker_services role from Stage 4d deploy play
MaNGOS systemd services remain unchanged.
Fixes PESO-104
- New zfs role with cron-based scrub scheduling for Linux and FreeBSD
- Weekly Sunday scrubs at noon (matching existing manual crons)
- Add zfs_hosts inventory group with london-a and london-b
- Configure zfs_pools per host: zroot (london-a), hdd (london-b)
- Add Prometheus alert rules for degraded/faulted/offline pools
- Add zfs.yml playbook for targeted deploys
Captures the previously untracked scrub cron on london-a and
re-enables the commented-out scrub on london-b.
Refs: PESO-93
helsinki-a runs Docker containers (authelia, forgejo, bitwarden) but was
missing from docker_hosts. This means the docker role and docker-status
playbook weren't targeting it during deploys.
Closes PESO-91
