feat: add disk exporter module and related configurations

- Introduced a new disk exporter module to monitor disk health using SMART data.
- Updated `apps.tf` to include the disk exporter module with necessary parameters.
- Added local variables for smartctl version and checksum in `config.tf`.
- Enhanced `alertmanager.yml` to handle DiskUnhealthy alerts with specific grouping and dispatch settings.
- Created new Prometheus rules for monitoring disk health, including alerts for unhealthy disks.
- Updated Prometheus configuration to scrape metrics from the new disk exporter.
- Enhanced Telegram notification template to include resolved alerts and improved formatting.
- Updated the auth-exporter module to specify the Python image tag correctly.
- Created the disk-exporter module with Kubernetes resources, including deployment, service account, and config map.
- Added necessary Python scripts and requirements for the disk exporter functionality.

terraform/apps/dev-01/resources/prometheus-rules.yml

@@ -2,9 +2,19 @@ groups:
   - name: auth.rules
     rules:
       - alert: UserLoggedIn
-        expr: increase(auth_sessions_active_by_user[1m]) > 0
+        expr: changes(auth_sessions_active_by_user[1m]) > 0
         labels:
           severity: info
         annotations:
-          summary: "Login: {{ $labels.username }} on {{ $labels.instance }}"
-          description: "User {{ $labels.username }} logged in via {{ $labels.source }} on {{ $labels.instance }}."
+          summary: "Login: {{ $labels.username }} on dev-01"
+          description: "User {{ $labels.username }} logged in via {{ $labels.source }} on dev-01."
+  - name: disk.rules
+    rules:
+      - alert: DiskUnhealthy
+        expr: count(disk_info{})-count(disk_healthy{}) > 0
+        for: 2m
+        labels:
+          severity: critical
+        annotations:
+          summary: "Disk unhealthy: {{ $labels.device }} on dev-01"
+          description: "SMART overall health failed for device {{ $labels.device }} (disk_healthy=0). Investigate immediately."