docs: add monitoring alerting updates

docs/backups.md

@@ -9,7 +9,7 @@ The goal is to ensure that all critical services can be restored after hardware
 Current state:
 
 ```text
-Backup v2 operational
+Backup v5.3 production
 ```
 
 ---
@@ -60,6 +60,34 @@ Operational
 
 ---
 
+### Backup v5.3
+
+Implemented:
+
+* PostgreSQL backup using `pg_dumpall`
+* MSSQL backup using `sqlcmd` and `docker cp`
+* Gitea backup
+* BaGet backup
+* OpenProject backup
+* Docker configuration backup
+* Final compressed archive
+* Lock file protection
+* Disk space validation
+* Central backup logging
+* Structured failure handling
+* Prometheus Textfile Collector metrics output
+* Backup success and failure tracking
+* Duration and size monitoring
+* Historical logging
+
+Status:
+
+```text
+Production
+```
+
+---
+
 ## Backup Priorities
 
 ### Critical
@@ -351,7 +379,7 @@ Suggested Structure:
 
 Current cleanup behavior:
 
-* Backup v2 monitors available disk space.
+* Backup v5.3 monitors available disk space.
 * If disk space is low, the oldest backups are deleted automatically.
 * Cleanup is logged.
 
@@ -431,13 +459,21 @@ Validation results:
 
 ## Monitoring Integration
 
-Backup v2 exports metrics for Prometheus.
+Backup v5.3 exports metrics for Prometheus.
 
 Current metrics:
 
 * Backup success
 * Backup duration
 * Backup size
+* Backup timestamp
+
+Metric names:
+
+* `silverlinux_backup_success`
+* `silverlinux_backup_duration_seconds`
+* `silverlinux_backup_size_bytes`
+* `silverlinux_backup_timestamp_seconds`
 
 Export path:
 
@@ -546,6 +582,7 @@ Verify:
 * docs/server.md
 * docs/security.md
 * docs/secrets.md
+* docs/monitoring.md
 * postgres/README.md
 * gitea/README.md
 * openproject/README.md