Add comprehensive Matrix alerting system with Grafana integration

- Implement custom Python alerting system (src/alerting.py) with water level monitoring, data freshness checks, and Matrix notifications
- Add complete Grafana Matrix alerting setup guide (docs/GRAFANA_MATRIX_SETUP.md) with webhook configuration, alert rules, and notification policies
- Create Matrix quick start guide (docs/MATRIX_QUICK_START.md) for rapid deployment
- Integrate alerting commands into main application (--alert-check, --alert-test)
- Add Matrix configuration to environment variables (.env.example)
- Update Makefile with alerting targets (alert-check, alert-test)
- Enhance status command to show Matrix notification status
- Support station-specific water level thresholds and escalation rules
- Provide dual alerting approach: native Grafana alerts and custom Python system

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.env.example

@@ -82,6 +82,18 @@ SMTP_PORT=587
 SMTP_USERNAME=
 SMTP_PASSWORD=
 
+# Matrix Alerting Configuration
+MATRIX_HOMESERVER=https://matrix.org
+MATRIX_ACCESS_TOKEN=
+MATRIX_ROOM_ID=
+
+# Grafana Integration
+GRAFANA_URL=http://localhost:3000
+
+# Alert Configuration
+ALERT_MAX_AGE_HOURS=2
+ALERT_CHECK_INTERVAL_MINUTES=15
+
 # Development Settings
 DEBUG=false
 DEVELOPMENT_MODE=false

Makefile

@@ -21,6 +21,11 @@ help:
 	@echo "  run          Run the monitor in continuous mode"
 	@echo "  run-api      Run the web API server"
 	@echo "  run-test     Run a single test cycle"
+	@echo "  run-status   Show system status"
+	@echo ""
+	@echo "Alerting:"
+	@echo "  alert-check  Check water levels and send alerts"
+	@echo "  alert-test   Send test Matrix message"
 	@echo ""
 	@echo "Distribution:"
 	@echo "  build-exe    Build standalone executable"
@@ -92,6 +97,13 @@ run-test:
 run-status:
 	uv run python run.py --status
 
+# Alerting
+alert-check:
+	uv run python run.py --alert-check
+
+alert-test:
+	uv run python run.py --alert-test
+
 # Docker
 docker-build:
 	docker build -t ping-river-monitor .

docs/GRAFANA_MATRIX_ALERTING.md

@@ -0,0 +1,168 @@
+# Grafana Matrix Alerting Setup
+
+## Overview
+Configure Grafana to send water level alerts directly to Matrix channels when thresholds are exceeded.
+
+## Prerequisites
+- Grafana instance with your PostgreSQL data source
+- Matrix account and access token
+- Matrix room for alerts
+
+## Step 1: Configure Matrix Contact Point
+
+1. **In Grafana, go to Alerting → Contact Points**
+2. **Add new contact point:**
+   ```
+   Name: matrix-water-alerts
+   Integration: Webhook
+   URL: https://matrix.org/_matrix/client/v3/rooms/!ROOM_ID:matrix.org/send/m.room.message
+   HTTP Method: POST
+   ```
+
+3. **Add Headers:**
+   ```
+   Authorization: Bearer YOUR_MATRIX_ACCESS_TOKEN
+   Content-Type: application/json
+   ```
+
+4. **Message Template:**
+   ```json
+   {
+     "msgtype": "m.text",
+     "body": "🌊 WATER ALERT: {{ .CommonLabels.alertname }}\n\nStation: {{ .CommonLabels.station_code }}\nLevel: {{ .CommonAnnotations.water_level }}m\nStatus: {{ .CommonLabels.severity }}\n\nTime: {{ .CommonAnnotations.time }}"
+   }
+   ```
+
+## Step 2: Create Alert Rules
+
+### High Water Level Alert
+```yaml
+Rule Name: high-water-level
+Query: water_level > 6.0
+Condition: IS ABOVE 6.0 FOR 5m
+Labels:
+  - severity: critical
+  - station_code: {{ .station_code }}
+Annotations:
+  - water_level: {{ .water_level }}
+  - summary: "Critical water level at {{ .station_code }}"
+```
+
+### Low Water Level Alert
+```yaml
+Rule Name: low-water-level
+Query: water_level < 1.0
+Condition: IS BELOW 1.0 FOR 10m
+Labels:
+  - severity: warning
+  - station_code: {{ .station_code }}
+```
+
+### Data Gap Alert
+```yaml
+Rule Name: data-gap
+Query: increase(measurements_total[1h]) == 0
+Condition: IS EQUAL TO 0 FOR 30m
+Labels:
+  - severity: warning
+  - issue: data-gap
+```
+
+## Step 3: Matrix Setup
+
+### Get Matrix Access Token
+```bash
+curl -X POST https://matrix.org/_matrix/client/v3/login \
+  -H "Content-Type: application/json" \
+  -d '{
+    "type": "m.login.password",
+    "user": "your_username",
+    "password": "your_password"
+  }'
+```
+
+### Create Alert Room
+```bash
+curl -X POST "https://matrix.org/_matrix/client/v3/createRoom" \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "name": "Water Level Alerts - Northern Thailand",
+    "topic": "Automated alerts for Ping River water monitoring",
+    "preset": "trusted_private_chat"
+  }'
+```
+
+## Example Alert Queries
+
+### Critical Water Levels
+```promql
+# High water alert
+water_level{station_code=~"P.1|P.4A|P.20"} > 6.0
+
+# Dangerous discharge
+discharge{station_code=~".*"} > 500
+
+# Rapid level change
+increase(water_level[15m]) > 0.5
+```
+
+### System Health
+```promql
+# No data received
+up{job="water-monitor"} == 0
+
+# Old data
+(time() - timestamp) > 7200
+```
+
+## Alert Notification Format
+
+Your Matrix messages will look like:
+```
+🌊 WATER ALERT: High Water Level
+
+Station: P.1 (Chiang Mai)
+Level: 6.2m (CRITICAL)
+Discharge: 450 cms
+Status: DANGER
+
+Time: 2025-09-26 14:30:00
+Trend: Rising (+0.3m in 30min)
+
+📍 Location: 18.7883°N, 98.9853°E
+```
+
+## Advanced Features
+
+### Escalation Rules
+```yaml
+# Send to different rooms based on severity
+- if: severity == "critical"
+  receiver: matrix-emergency
+- if: severity == "warning"
+  receiver: matrix-alerts
+- if: time_of_day() outside "08:00-20:00"
+  receiver: matrix-night-duty
+```
+
+### Rate Limiting
+```yaml
+group_wait: 5m
+group_interval: 10m
+repeat_interval: 30m
+```
+
+## Testing Alerts
+
+1. **Test Contact Point** - Use Grafana's test button
+2. **Simulate Alert** - Manually trigger with test data
+3. **Verify Matrix** - Check message formatting and delivery
+
+## Troubleshooting
+
+### Common Issues
+- **403 Forbidden**: Check Matrix access token
+- **Room not found**: Verify room ID format
+- **No alerts**: Check query syntax and thresholds
+- **Spam**: Configure proper grouping and intervals

docs/GRAFANA_MATRIX_SETUP.md

@@ -0,0 +1,351 @@
+# Complete Grafana Matrix Alerting Setup Guide
+
+## Overview
+Configure Grafana to send water level alerts directly to Matrix channels when thresholds are exceeded.
+
+## Prerequisites
+- Grafana instance running (v8.0+)
+- PostgreSQL data source configured in Grafana
+- Matrix account
+- Matrix room for alerts
+
+## Step 1: Get Matrix Access Token
+
+### Method 1: Using curl
+```bash
+curl -X POST https://matrix.org/_matrix/client/v3/login \
+  -H "Content-Type: application/json" \
+  -d '{
+    "type": "m.login.password",
+    "user": "your_username",
+    "password": "your_password"
+  }'
+```
+
+### Method 2: Using Element Web Client
+1. Open Element in browser: https://app.element.io
+2. Login to your account
+3. Go to Settings → Help & About → Advanced
+4. Copy your Access Token
+
+### Method 3: Using Matrix Admin Panel
+- If you have admin access to your homeserver, generate token via admin API
+
+## Step 2: Create Alert Room
+
+```bash
+curl -X POST "https://matrix.org/_matrix/client/v3/createRoom" \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "name": "Water Level Alerts - Northern Thailand",
+    "topic": "Automated alerts for Ping River water monitoring",
+    "preset": "private_chat"
+  }'
+```
+
+Save the `room_id` from the response (format: !roomid:homeserver.com)
+
+## Step 3: Configure Grafana Contact Point
+
+### Navigate to Alerting
+1. In Grafana, go to **Alerting → Contact Points**
+2. Click **Add contact point**
+
+### Contact Point Settings
+```
+Name: matrix-water-alerts
+Integration: Webhook
+URL: https://matrix.org/_matrix/client/v3/rooms/!YOUR_ROOM_ID:matrix.org/send/m.room.message/{{ .GroupLabels.alertname }}_{{ .GroupLabels.severity }}_{{ now.Unix }}
+HTTP Method: POST
+```
+
+### Headers
+```
+Authorization: Bearer YOUR_MATRIX_ACCESS_TOKEN
+Content-Type: application/json
+```
+
+### Message Template (JSON Body)
+```json
+{
+  "msgtype": "m.text",
+  "body": "🌊 **PING RIVER WATER ALERT**\n\n**Alert:** {{ .GroupLabels.alertname }}\n**Severity:** {{ .GroupLabels.severity | toUpper }}\n**Station:** {{ .GroupLabels.station_code }} ({{ .GroupLabels.station_name }})\n\n{{ range .Alerts }}**Status:** {{ .Status | toUpper }}\n**Water Level:** {{ .Annotations.water_level }}m\n**Threshold:** {{ .Annotations.threshold }}m\n**Time:** {{ .StartsAt.Format \"2006-01-02 15:04:05\" }}\n{{ if .Annotations.discharge }}**Discharge:** {{ .Annotations.discharge }} cms\n{{ end }}{{ if .Annotations.message }}**Details:** {{ .Annotations.message }}\n{{ end }}{{ end }}\n📈 **Dashboard:** {{ .ExternalURL }}\n📍 **Location:** Northern Thailand Ping River"
+}
+```
+
+## Step 4: Create Alert Rules
+
+### High Water Level Alert
+```yaml
+# Rule Configuration
+Rule Name: high-water-level
+Evaluation Group: water-level-alerts
+Folder: Water Monitoring
+
+# Query A
+SELECT
+  station_code,
+  station_name_th as station_name,
+  water_level,
+  discharge,
+  timestamp
+FROM water_measurements
+WHERE
+  timestamp > now() - interval '5 minutes'
+  AND water_level > 6.0
+
+# Condition
+IS ABOVE 6.0 FOR 5 minutes
+
+# Labels
+severity: critical
+alertname: High Water Level
+station_code: {{ $labels.station_code }}
+station_name: {{ $labels.station_name }}
+
+# Annotations
+water_level: {{ $values.water_level }}
+threshold: 6.0
+discharge: {{ $values.discharge }}
+summary: Critical water level detected at {{ $labels.station_code }}
+```
+
+### Emergency Water Level Alert
+```yaml
+Rule Name: emergency-water-level
+Query: water_level > 8.0
+Condition: IS ABOVE 8.0 FOR 2 minutes
+Labels:
+  severity: emergency
+  alertname: Emergency Water Level
+Annotations:
+  threshold: 8.0
+  message: IMMEDIATE ACTION REQUIRED - Flood risk imminent
+```
+
+### Low Water Level Alert
+```yaml
+Rule Name: low-water-level
+Query: water_level < 1.0
+Condition: IS BELOW 1.0 FOR 15 minutes
+Labels:
+  severity: warning
+  alertname: Low Water Level
+Annotations:
+  threshold: 1.0
+  message: Drought conditions detected
+```
+
+### Data Gap Alert
+```yaml
+Rule Name: data-gap
+Query:
+  SELECT
+    station_code,
+    MAX(timestamp) as last_seen
+  FROM water_measurements
+  GROUP BY station_code
+  HAVING MAX(timestamp) < now() - interval '2 hours'
+
+Condition: HAS NO DATA FOR 30 minutes
+Labels:
+  severity: warning
+  alertname: Data Gap
+  issue: missing-data
+```
+
+### Rapid Level Change Alert
+```yaml
+Rule Name: rapid-level-change
+Query:
+  SELECT
+    station_code,
+    water_level,
+    LAG(water_level, 1) OVER (PARTITION BY station_code ORDER BY timestamp) as prev_level
+  FROM water_measurements
+  WHERE timestamp > now() - interval '15 minutes'
+  HAVING ABS(water_level - prev_level) > 0.5
+
+Condition: CHANGE > 0.5m FOR 1 minute
+Labels:
+  severity: warning
+  alertname: Rapid Water Level Change
+```
+
+## Step 5: Configure Notification Policy
+
+### Create Notification Policy
+```yaml
+# Policy Tree
+- receiver: matrix-water-alerts
+  match:
+    severity: emergency|critical
+  group_wait: 10s
+  group_interval: 5m
+  repeat_interval: 30m
+
+- receiver: matrix-water-alerts
+  match:
+    severity: warning
+  group_wait: 30s
+  group_interval: 10m
+  repeat_interval: 2h
+```
+
+### Grouping Rules
+```yaml
+group_by: [alertname, station_code]
+group_wait: 10s
+group_interval: 5m
+repeat_interval: 1h
+```
+
+## Step 6: Station-Specific Thresholds
+
+Create separate rules for each station with appropriate thresholds:
+
+```sql
+-- P.1 (Chiang Mai) - Urban area, higher thresholds
+SELECT * FROM water_measurements
+WHERE station_code = 'P.1' AND water_level > 6.5
+
+-- P.4A (Mae Ping) - Agricultural area
+SELECT * FROM water_measurements
+WHERE station_code = 'P.4A' AND water_level > 5.0
+
+-- P.20 (Downstream) - Lower threshold
+SELECT * FROM water_measurements
+WHERE station_code = 'P.20' AND water_level > 4.0
+```
+
+## Step 7: Advanced Features
+
+### Time-Based Routing
+```yaml
+# Different receivers for day/night
+time_intervals:
+  - name: working_hours
+    time_intervals:
+      - times:
+        - start_time: '08:00'
+          end_time: '20:00'
+        weekdays: ['monday:friday']
+
+routes:
+  - receiver: matrix-alerts-day
+    match:
+      severity: warning
+    active_time_intervals: [working_hours]
+
+  - receiver: matrix-alerts-night
+    match:
+      severity: warning
+    active_time_intervals: ['!working_hours']
+```
+
+### Multi-Channel Alerts
+```yaml
+# Send critical alerts to multiple rooms
+- receiver: matrix-emergency
+  webhook_configs:
+    - url: https://matrix.org/_matrix/client/v3/rooms/!emergency:matrix.org/send/m.room.message
+      http_config:
+        authorization:
+          credentials: "Bearer EMERGENCY_TOKEN"
+    - url: https://matrix.org/_matrix/client/v3/rooms/!general:matrix.org/send/m.room.message
+      http_config:
+        authorization:
+          credentials: "Bearer GENERAL_TOKEN"
+```
+
+## Step 8: Testing
+
+### Test Contact Point
+1. Go to Contact Points in Grafana
+2. Select your Matrix contact point
+3. Click "Test" button
+4. Check Matrix room for test message
+
+### Test Alert Rules
+1. Temporarily lower thresholds
+2. Wait for condition to trigger
+3. Verify alert appears in Grafana
+4. Verify Matrix message received
+5. Reset thresholds
+
+### Manual Alert Trigger
+```bash
+# Simulate high water level in database
+INSERT INTO water_measurements (station_code, water_level, timestamp)
+VALUES ('P.1', 7.5, NOW());
+```
+
+## Troubleshooting
+
+### Common Issues
+
+#### 403 Forbidden
+- **Cause**: Invalid Matrix access token
+- **Fix**: Regenerate token or check permissions
+
+#### Room Not Found
+- **Cause**: Incorrect room ID format
+- **Fix**: Ensure room ID starts with ! and includes homeserver
+
+#### No Alerts Firing
+- **Cause**: Query returns no results
+- **Fix**: Test queries in Grafana Explore, check data availability
+
+#### Alert Spam
+- **Cause**: No grouping configured
+- **Fix**: Configure proper group_by and intervals
+
+#### Messages Not Formatted
+- **Cause**: Template syntax errors
+- **Fix**: Validate JSON template, check Grafana template docs
+
+### Debug Steps
+1. Check Grafana alert rule status
+2. Verify contact point test succeeds
+3. Check Grafana logs: `/var/log/grafana/grafana.log`
+4. Test Matrix API directly with curl
+5. Verify database connectivity and query results
+
+## Environment Variables
+
+Add to your `.env`:
+```bash
+MATRIX_HOMESERVER=https://matrix.org
+MATRIX_ACCESS_TOKEN=your_access_token_here
+MATRIX_ROOM_ID=!your_room_id:matrix.org
+GRAFANA_URL=http://your-grafana-host:3000
+```
+
+## Example Alert Message
+Your Matrix messages will appear as:
+```
+🌊 **PING RIVER WATER ALERT**
+
+**Alert:** High Water Level
+**Severity:** CRITICAL
+**Station:** P.1 (สถานีเชียงใหม่)
+
+**Status:** FIRING
+**Water Level:** 6.75m
+**Threshold:** 6.0m
+**Time:** 2025-09-26 14:30:00
+**Discharge:** 450.2 cms
+
+📈 **Dashboard:** http://grafana:3000
+📍 **Location:** Northern Thailand Ping River
+```
+
+## Security Notes
+- Store Matrix tokens securely (environment variables)
+- Use room-specific tokens when possible
+- Enable rate limiting to prevent spam
+- Consider using dedicated alerting user account
+- Regularly rotate access tokens
+
+This setup provides comprehensive water level monitoring with immediate Matrix notifications when thresholds are exceeded.

docs/MATRIX_QUICK_START.md

@@ -0,0 +1,85 @@
+# Quick Matrix Alerting Setup
+
+## Step 1: Get Matrix Account
+1. Go to https://app.element.io or install Element app
+2. Create account or login with existing Matrix account
+
+## Step 2: Get Access Token
+
+### Method 1: Element Web (Recommended)
+1. Open Element in browser: https://app.element.io
+2. Login to your account
+3. Click Settings (gear icon) → Help & About → Advanced
+4. Copy your "Access Token" (starts with `syt_...` or similar)
+
+### Method 2: Command Line
+```bash
+curl -X POST https://matrix.org/_matrix/client/v3/login \
+  -H "Content-Type: application/json" \
+  -d '{
+    "type": "m.login.password",
+    "user": "your_username",
+    "password": "your_password"
+  }'
+```
+
+## Step 3: Create Alert Room
+1. In Element, click "+" to create new room
+2. Name: "Water Level Alerts"
+3. Set to Private
+4. Copy the room ID from room settings (format: `!roomid:matrix.org`)
+
+## Step 4: Configure .env File
+Add these to your `.env` file:
+```bash
+# Matrix Alerting Configuration
+MATRIX_HOMESERVER=https://matrix.org
+MATRIX_ACCESS_TOKEN=syt_your_access_token_here
+MATRIX_ROOM_ID=!your_room_id:matrix.org
+
+# Grafana Integration (optional)
+GRAFANA_URL=http://localhost:3000
+```
+
+## Step 5: Test Configuration
+```bash
+# Test Matrix connection
+uv run python run.py --alert-test
+
+# Check system status (shows Matrix config)
+uv run python run.py --status
+
+# Run alert check
+uv run python run.py --alert-check
+```
+
+## Example Alert Message
+When thresholds are exceeded, you'll receive messages like:
+```
+🌊 **WATER LEVEL ALERT**
+
+**Station:** P.1 (สถานีเชียงใหม่)
+**Alert Type:** Critical Water Level
+**Severity:** CRITICAL
+
+**Current Level:** 6.75m
+**Threshold:** 6.0m
+**Difference:** +0.75m
+**Discharge:** 450.2 cms
+
+**Time:** 2025-09-26 14:30:00
+
+📈 View dashboard: http://localhost:3000
+```
+
+## Cron Job Setup (Optional)
+Add to crontab for automatic alerting:
+```bash
+# Check water levels every 15 minutes
+*/15 * * * * cd /path/to/monitor && uv run python run.py --alert-check >> alerts.log 2>&1
+```
+
+## Troubleshooting
+- **403 Error**: Check Matrix access token is valid
+- **Room Not Found**: Verify room ID includes `!` prefix and `:homeserver.com` suffix
+- **No Alerts**: Check database has recent data with `uv run python run.py --status`

src/alerting.py

@@ -0,0 +1,334 @@
+#!/usr/bin/env python3
+"""
+Water Level Alerting System with Matrix Integration
+"""
+
+import os
+import json
+import requests
+import datetime
+from typing import List, Dict, Optional
+from dataclasses import dataclass
+from enum import Enum
+
+try:
+    from .config import Config
+    from .database_adapters import create_database_adapter
+    from .logging_config import get_logger
+except ImportError:
+    from config import Config
+    from database_adapters import create_database_adapter
+    import logging
+    def get_logger(name):
+        return logging.getLogger(name)
+
+logger = get_logger(__name__)
+
+class AlertLevel(Enum):
+    INFO = "info"
+    WARNING = "warning"
+    CRITICAL = "critical"
+    EMERGENCY = "emergency"
+
+@dataclass
+class WaterAlert:
+    station_code: str
+    station_name: str
+    alert_type: str
+    level: AlertLevel
+    water_level: float
+    threshold: float
+    discharge: Optional[float] = None
+    timestamp: Optional[datetime.datetime] = None
+    message: Optional[str] = None
+
+class MatrixNotifier:
+    def __init__(self, homeserver: str, access_token: str, room_id: str):
+        self.homeserver = homeserver.rstrip('/')
+        self.access_token = access_token
+        self.room_id = room_id
+        self.session = requests.Session()
+
+    def send_message(self, message: str, msgtype: str = "m.text") -> bool:
+        """Send message to Matrix room"""
+        try:
+            url = f"{self.homeserver}/_matrix/client/v3/rooms/{self.room_id}/send/m.room.message"
+
+            headers = {
+                "Authorization": f"Bearer {self.access_token}",
+                "Content-Type": "application/json"
+            }
+
+            data = {
+                "msgtype": msgtype,
+                "body": message
+            }
+
+            # Add transaction ID to prevent duplicates
+            txn_id = datetime.datetime.now().strftime("%Y%m%d_%H%M%S_%f")
+            url += f"/{txn_id}"
+
+            response = self.session.post(url, headers=headers, json=data, timeout=10)
+            response.raise_for_status()
+
+            logger.info(f"Matrix message sent successfully: {response.json().get('event_id')}")
+            return True
+
+        except Exception as e:
+            logger.error(f"Failed to send Matrix message: {e}")
+            return False
+
+    def send_alert(self, alert: WaterAlert) -> bool:
+        """Send formatted water alert to Matrix"""
+        emoji_map = {
+            AlertLevel.INFO: "ℹ️",
+            AlertLevel.WARNING: "⚠️",
+            AlertLevel.CRITICAL: "🚨",
+            AlertLevel.EMERGENCY: "🆘"
+        }
+
+        emoji = emoji_map.get(alert.level, "📊")
+
+        message = f"""{emoji} **WATER LEVEL ALERT**
+
+**Station:** {alert.station_code} ({alert.station_name})
+**Alert Type:** {alert.alert_type}
+**Severity:** {alert.level.value.upper()}
+
+**Current Level:** {alert.water_level:.2f}m
+**Threshold:** {alert.threshold:.2f}m
+**Difference:** {(alert.water_level - alert.threshold):+.2f}m
+"""
+
+        if alert.discharge:
+            message += f"**Discharge:** {alert.discharge:.1f} cms\n"
+
+        if alert.timestamp:
+            message += f"**Time:** {alert.timestamp.strftime('%Y-%m-%d %H:%M:%S')}\n"
+
+        if alert.message:
+            message += f"\n**Details:** {alert.message}\n"
+
+        message += f"\n📈 View dashboard: {os.getenv('GRAFANA_URL', 'http://localhost:3000')}"
+
+        return self.send_message(message)
+
+class WaterLevelAlertSystem:
+    def __init__(self):
+        self.db_adapter = None
+        self.matrix_notifier = None
+        self.thresholds = self._load_thresholds()
+
+        # Matrix configuration from environment
+        matrix_homeserver = os.getenv('MATRIX_HOMESERVER', 'https://matrix.org')
+        matrix_token = os.getenv('MATRIX_ACCESS_TOKEN')
+        matrix_room = os.getenv('MATRIX_ROOM_ID')
+
+        if matrix_token and matrix_room:
+            self.matrix_notifier = MatrixNotifier(matrix_homeserver, matrix_token, matrix_room)
+            logger.info("Matrix notifications enabled")
+        else:
+            logger.warning("Matrix configuration missing - notifications disabled")
+
+    def _load_thresholds(self) -> Dict[str, Dict[str, float]]:
+        """Load alert thresholds from config or database"""
+        # Default thresholds for Northern Thailand stations
+        return {
+            "P.1": {"warning": 5.0, "critical": 6.5, "emergency": 8.0},
+            "P.4A": {"warning": 4.5, "critical": 6.0, "emergency": 7.5},
+            "P.20": {"warning": 3.0, "critical": 4.5, "emergency": 6.0},
+            "P.21": {"warning": 4.0, "critical": 5.5, "emergency": 7.0},
+            "P.67": {"warning": 6.0, "critical": 8.0, "emergency": 10.0},
+            "P.75": {"warning": 5.5, "critical": 7.5, "emergency": 9.5},
+            "P.103": {"warning": 7.0, "critical": 9.0, "emergency": 11.0},
+            # Default for unknown stations
+            "default": {"warning": 4.0, "critical": 6.0, "emergency": 8.0}
+        }
+
+    def connect_database(self):
+        """Initialize database connection"""
+        try:
+            db_config = Config.get_database_config()
+            self.db_adapter = create_database_adapter(
+                db_config['type'],
+                connection_string=db_config['connection_string']
+            )
+
+            if self.db_adapter.connect():
+                logger.info("Database connection established for alerting")
+                return True
+            else:
+                logger.error("Failed to connect to database")
+                return False
+
+        except Exception as e:
+            logger.error(f"Database connection error: {e}")
+            return False
+
+    def check_water_levels(self) -> List[WaterAlert]:
+        """Check current water levels against thresholds"""
+        alerts = []
+
+        if not self.db_adapter:
+            logger.error("Database not connected")
+            return alerts
+
+        try:
+            # Get latest measurements
+            measurements = self.db_adapter.get_latest_measurements(limit=50)
+
+            for measurement in measurements:
+                station_code = measurement.get('station_code', 'UNKNOWN')
+                water_level = measurement.get('water_level')
+
+                if not water_level:
+                    continue
+
+                # Get thresholds for this station
+                station_thresholds = self.thresholds.get(station_code, self.thresholds['default'])
+
+                # Check each threshold level
+                alert_level = None
+                threshold_value = None
+                alert_type = None
+
+                if water_level >= station_thresholds['emergency']:
+                    alert_level = AlertLevel.EMERGENCY
+                    threshold_value = station_thresholds['emergency']
+                    alert_type = "Emergency Water Level"
+                elif water_level >= station_thresholds['critical']:
+                    alert_level = AlertLevel.CRITICAL
+                    threshold_value = station_thresholds['critical']
+                    alert_type = "Critical Water Level"
+                elif water_level >= station_thresholds['warning']:
+                    alert_level = AlertLevel.WARNING
+                    threshold_value = station_thresholds['warning']
+                    alert_type = "High Water Level"
+
+                if alert_level:
+                    alert = WaterAlert(
+                        station_code=station_code,
+                        station_name=measurement.get('station_name_th', f'Station {station_code}'),
+                        alert_type=alert_type,
+                        level=alert_level,
+                        water_level=water_level,
+                        threshold=threshold_value,
+                        discharge=measurement.get('discharge'),
+                        timestamp=measurement.get('timestamp')
+                    )
+                    alerts.append(alert)
+
+        except Exception as e:
+            logger.error(f"Error checking water levels: {e}")
+
+        return alerts
+
+    def check_data_freshness(self, max_age_hours: int = 2) -> List[WaterAlert]:
+        """Check if data is fresh enough"""
+        alerts = []
+
+        if not self.db_adapter:
+            return alerts
+
+        try:
+            measurements = self.db_adapter.get_latest_measurements(limit=20)
+            cutoff_time = datetime.datetime.now() - datetime.timedelta(hours=max_age_hours)
+
+            for measurement in measurements:
+                timestamp = measurement.get('timestamp')
+                if timestamp and timestamp < cutoff_time:
+                    station_code = measurement.get('station_code', 'UNKNOWN')
+
+                    age_hours = (datetime.datetime.now() - timestamp).total_seconds() / 3600
+
+                    alert = WaterAlert(
+                        station_code=station_code,
+                        station_name=measurement.get('station_name_th', f'Station {station_code}'),
+                        alert_type="Stale Data",
+                        level=AlertLevel.WARNING,
+                        water_level=measurement.get('water_level', 0),
+                        threshold=max_age_hours,
+                        timestamp=timestamp,
+                        message=f"No fresh data for {age_hours:.1f} hours"
+                    )
+                    alerts.append(alert)
+
+        except Exception as e:
+            logger.error(f"Error checking data freshness: {e}")
+
+        return alerts
+
+    def send_alerts(self, alerts: List[WaterAlert]) -> int:
+        """Send alerts via configured channels"""
+        sent_count = 0
+
+        if not alerts:
+            return sent_count
+
+        if self.matrix_notifier:
+            for alert in alerts:
+                if self.matrix_notifier.send_alert(alert):
+                    sent_count += 1
+
+        # Could add other notification channels here:
+        # - Email
+        # - Discord
+        # - Telegram
+        # - SMS
+
+        return sent_count
+
+    def run_alert_check(self) -> Dict[str, int]:
+        """Run complete alert check cycle"""
+        if not self.connect_database():
+            return {"error": 1}
+
+        # Check water levels
+        water_alerts = self.check_water_levels()
+
+        # Check data freshness
+        data_alerts = self.check_data_freshness()
+
+        # Combine alerts
+        all_alerts = water_alerts + data_alerts
+
+        # Send alerts
+        sent_count = self.send_alerts(all_alerts)
+
+        logger.info(f"Alert check complete: {len(all_alerts)} alerts, {sent_count} sent")
+
+        return {
+            "water_alerts": len(water_alerts),
+            "data_alerts": len(data_alerts),
+            "total_alerts": len(all_alerts),
+            "sent": sent_count
+        }
+
+def main():
+    """Standalone alerting check"""
+    import argparse
+
+    parser = argparse.ArgumentParser(description="Water Level Alert System")
+    parser.add_argument("--check", action="store_true", help="Run alert check")
+    parser.add_argument("--test", action="store_true", help="Send test message")
+    args = parser.parse_args()
+
+    alerting = WaterLevelAlertSystem()
+
+    if args.test:
+        if alerting.matrix_notifier:
+            test_message = "🧪 **Test Alert**\n\nThis is a test message from the Water Level Alert System.\n\nIf you received this, Matrix notifications are working correctly!"
+            success = alerting.matrix_notifier.send_message(test_message)
+            print(f"Test message sent: {success}")
+        else:
+            print("Matrix notifier not configured")
+
+    elif args.check:
+        results = alerting.run_alert_check()
+        print(f"Alert check results: {results}")
+
+    else:
+        print("Use --check or --test")
+
+if __name__ == "__main__":
+    main()

src/main.py

@@ -180,6 +180,65 @@ def run_web_api():
         logger.error(f"Web API failed: {e}")
         return False
 
+def run_alert_check():
+    """Run water level alert check"""
+    logger.info("Running water level alert check...")
+
+    try:
+        from .alerting import WaterLevelAlertSystem
+
+        # Initialize alerting system
+        alerting = WaterLevelAlertSystem()
+
+        # Run alert check
+        results = alerting.run_alert_check()
+
+        if 'error' in results:
+            logger.error("❌ Alert check failed due to database connection")
+            return False
+
+        logger.info(f"✅ Alert check completed:")
+        logger.info(f"  • Water level alerts: {results['water_alerts']}")
+        logger.info(f"  • Data freshness alerts: {results['data_alerts']}")
+        logger.info(f"  • Total alerts generated: {results['total_alerts']}")
+        logger.info(f"  • Alerts sent: {results['sent']}")
+
+        return True
+
+    except Exception as e:
+        logger.error(f"❌ Alert check failed: {e}")
+        return False
+
+def run_alert_test():
+    """Send test alert message"""
+    logger.info("Sending test alert message...")
+
+    try:
+        from .alerting import WaterLevelAlertSystem
+
+        # Initialize alerting system
+        alerting = WaterLevelAlertSystem()
+
+        if not alerting.matrix_notifier:
+            logger.error("❌ Matrix notifier not configured")
+            logger.info("Please set MATRIX_ACCESS_TOKEN and MATRIX_ROOM_ID in your .env file")
+            return False
+
+        # Send test message
+        test_message = "🧪 **Test Alert**\n\nThis is a test message from the Northern Thailand Ping River Monitor.\n\nIf you received this, Matrix notifications are working correctly!"
+        success = alerting.matrix_notifier.send_message(test_message)
+
+        if success:
+            logger.info("✅ Test alert message sent successfully")
+        else:
+            logger.error("❌ Test alert message failed to send")
+
+        return success
+
+    except Exception as e:
+        logger.error(f"❌ Test alert failed: {e}")
+        return False
+
 def show_status():
     """Show current system status"""
     logger.info("=== Northern Thailand Ping River Monitor Status ===")
@@ -210,6 +269,20 @@ def show_status():
         else:
             logger.error("❌ Database connection failed")
 
+        # Test alerting system
+        logger.info("\n=== Alerting System Status ===")
+        try:
+            from .alerting import WaterLevelAlertSystem
+            alerting = WaterLevelAlertSystem()
+
+            if alerting.matrix_notifier:
+                logger.info("✅ Matrix notifications configured")
+            else:
+                logger.warning("⚠️ Matrix notifications not configured")
+                logger.info("Set MATRIX_ACCESS_TOKEN and MATRIX_ROOM_ID in .env file")
+        except Exception as e:
+            logger.error(f"❌ Alerting system error: {e}")
+
         # Show metrics if available
         metrics_collector = get_metrics_collector()
         metrics = metrics_collector.get_all_metrics()
@@ -239,6 +312,8 @@ Examples:
   %(prog)s --fill-gaps 7            # Fill missing data for last 7 days
   %(prog)s --update-data 2          # Update existing data for last 2 days
   %(prog)s --status                 # Show system status
+  %(prog)s --alert-check            # Check water levels and send alerts
+  %(prog)s --alert-test             # Send test Matrix message
         """
     )
     
@@ -274,6 +349,18 @@ Examples:
         help="Show current system status"
     )
 
+    parser.add_argument(
+        "--alert-check",
+        action="store_true",
+        help="Run water level alert check"
+    )
+
+    parser.add_argument(
+        "--alert-test",
+        action="store_true",
+        help="Send test alert message to Matrix"
+    )
+
     parser.add_argument(
         "--log-level",
         choices=["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"],
@@ -314,6 +401,10 @@ Examples:
             success = run_data_update(args.update_data)
         elif args.status:
             success = show_status()
+        elif args.alert_check:
+            success = run_alert_check()
+        elif args.alert_test:
+            success = run_alert_test()
         else:
             success = run_continuous_monitoring()