Add Zabbix monitoring service documentation

Home.md

@@ -12,6 +12,7 @@
 - [[Open-WebUI]] — AI chat interface
 - [[Home-Assistant]] — KVM virtual machine
 - [[3X-UI]] — VPN proxy
+- [Zabbix](Zabbix) — Monitoring (Zabbix 7.4, PostgreSQL, Apache)
 
 ## Quick Start
 

Zabbix.md

@@ -0,0 +1,46 @@
+# Zabbix
+
+Monitoring stack — Zabbix 7.4 with PostgreSQL backend, Apache web frontend, and active agent.
+
+## Stack
+
+| Component | Image |
+|-----------|-------|
+| Zabbix Server | `zabbix/zabbix-server-pgsql:ubuntu-7.4-latest` |
+| Web Frontend | `zabbix/zabbix-web-apache-pgsql:ubuntu-7.4-latest` |
+| Agent (active) | `zabbix/zabbix-agent:ubuntu-7.4-latest` |
+| Database | `postgres:16-alpine` |
+
+## Access
+
+- URL: https://zb.alogins.net (Caddy → localhost:81)
+- Default credentials: `Admin` / `zabbix`
+
+## Config
+
+Directory: `agap_git/zabbix/`
+
+`.env` variables:
+
+| Variable | Description |
+|----------|-------------|
+| `WEB_PORT` | Host port for web frontend (81) |
+| `PHP_TZ` | Timezone for PHP/web |
+| `AGENT_HOSTNAME` | Hostname reported by agent |
+| `POSTGRES_DATA_DIR` | PostgreSQL data path (`/mnt/ssd/dbs/zabbix`) |
+| `POSTGRES_USER` | DB username |
+| `POSTGRES_PASSWORD` | DB password |
+| `POSTGRES_DB` | DB name |
+
+## Start
+
+```bash
+cd agap_git/zabbix
+docker compose up -d
+```
+
+## Notes
+
+- Agent runs in active mode only (`ZBX_PASSIVE_ALLOW=false`)
+- Zabbix server port 10051 is exposed on host for external agents
+- Database network is internal (not exposed)