# 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