Add water leak sensor alerting docs to HA and Zabbix pages

Home-Assistant.md

@@ -41,3 +41,23 @@ virt-install \
 
 - If boot fails, disable Secure Boot in UEFI firmware settings ([reference](https://www.reddit.com/r/homeassistant/comments/198yg1a/trying_to_install_ha_as_a_virtual_machine_in/))
 - Find assigned IP at router admin panel
+
+## Zabbix Alerting
+
+HA pushes alerts to Zabbix via `rest_command` → Zabbix `history.push` API (trapper items).
+
+### Water Leak Sensors
+
+3x HOBEIAN ZG-222Z Zigbee moisture sensors:
+
+| Entity | Room |
+|--------|------|
+| `binary_sensor.hobeian_zg_222z` | Kitchen |
+| `binary_sensor.hobeian_zg_222z_2` | Bathroom |
+| `binary_sensor.hobeian_zg_222z_3` | Laundry |
+
+- Sensor ON → automation sends room name to Zabbix trapper item `water.leak` on host "HA Agap"
+- Zabbix trigger fires Disaster alert: "Water leak detected in {room}"
+- All sensors OFF → automation sends "ok" to clear
+
+Config: `rest_command` entries in `configuration.yaml`, automations `water_leak_alert` and `water_leak_clear`.

Zabbix.md

@@ -51,6 +51,16 @@ cd agap_git/zabbix
 docker compose up -d
 ```
 
+## HA Trapper Items
+
+Host "HA Agap" receives alerts from Home Assistant via `history.push` API.
+
+| Item Key | Type | Trigger | Severity |
+|----------|------|---------|----------|
+| `water.leak` | Text trapper | `last() <> "ok"` → "Water leak detected in {room}" | Disaster |
+
+To add a new HA alert: create a trapper item + trigger on "HA Agap", add `rest_command` in HA `configuration.yaml`, create HA automation to call it.
+
 ## Notes
 
 - Zabbix server port 10051 is exposed on the host for the host agent