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Another big round of refactoring and cleaning...

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Kevin Veen-Birkenbach
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# sys-hlth-btrfs
## Description
Checks the health of all mounted Btrfs filesystems by inspecting device error counters.
## Features
- Iterates over every Btrfs filesystem.
- Runs `btrfs device stats` and alerts if any error counters are non-zero.
- Hooks into systemd and a timer for regular checks.
- On failure, calls `sys-alm-compose.cymais@…` for notification.
## Usage
Just include this role in your playbook; it will:
1. Deploy a small shell script under `{{ path_administrator_scripts }}/sys-hlth-btrfs/`.
2. Install a `.service` and `.timer` unit.
3. Send alerts via `sys-alm-compose` if any filesystem shows errors.