---
name: self-monitor
version: 1.1.0
author: Polycat
tags: [monitoring, health, infrastructure]
license: MIT
platform: universal
description: >
  Proactive self-monitoring of infrastructure, services, and health. Tracks
  disk/memory/load, service health, cron job status, recent errors. Auto-fixes safe
  issues. Triggers on: health check, heartbeat, monitor status, service status,
  infrastructure check.
---

> **Compatible with Claude Code, Codex CLI, Cursor, Windsurf, and any SKILL.md-compatible agent.**

# Self Monitor

Proactive self-monitoring: infrastructure, services, and health.

## Usage

Run during heartbeats or scheduled checks.

### 1. Infrastructure Health

```bash
# Disk usage
df -h / | awk 'NR==2 {print $5}' | tr -d '%'

# Memory usage  
free -m | awk 'NR==2 {printf "%.0f", $3/$2*100}'

# Load average
uptime | awk -F'load average:' '{print $2}' | awk -F',' '{print $1}'

# Top processes by memory
ps aux --sort=-%mem | head -10

# Top processes by CPU
ps aux --sort=-%cpu | head -10
```

**Thresholds:**
| Metric | Warning | Critical |
|--------|---------|----------|
| Disk | > 80% | > 90% |
| Memory | > 85% | > 95% |
| Load | > 2.0 | > 4.0 |

### 2. Service Health

```bash
# Check if a process is running
pgrep -f "your_process_name" >/dev/null && echo "OK" || echo "FAIL"

# Check HTTP endpoint
curl -s -o /dev/null -w "%{http_code}" http://localhost:8080/health

# Check systemd service
systemctl is-active --quiet nginx && echo "OK" || echo "FAIL"

# Check Docker container
docker ps --filter "name=mycontainer" --filter "status=running" -q | grep -q . && echo "OK" || echo "FAIL"

# Tailscale (if using)
tailscale status --json 2>/dev/null | jq -r '.Self.Online' || echo "FAIL"
```

### 3. Cron Job Health

```bash
# Check recent cron executions
grep CRON /var/log/syslog | tail -20

# Count failures in last 24h
grep -c "CRON.*error\|CRON.*fail" /var/log/syslog

# List scheduled jobs
crontab -l
```

### 4. Recent Errors

```bash
# Check system logs for errors
journalctl -p err --since "1 hour ago" 2>/dev/null | tail -20

# Check application logs
tail -50 ~/workspace/projects/*/logs/*.log 2>/dev/null | grep -i "error"

# Check dmesg for hardware/kernel issues
dmesg | tail -20 | grep -i "error\|fail\|warn"
```

## Quick Health Check (for heartbeat)

```bash
#!/bin/bash
# Quick health snapshot

DISK=$(df -h / | awk 'NR==2 {print $5}' | tr -d '%')
MEM=$(free -m | awk 'NR==2 {printf "%.0f", $3/$2*100}')
LOAD=$(uptime | awk -F'load average:' '{print $2}' | awk -F',' '{print $1}' | xargs)

echo "Disk: ${DISK}% | Mem: ${MEM}% | Load: ${LOAD}"

# Alert if thresholds exceeded
[ "$DISK" -gt 90 ] && echo "⚠️ Disk critical!"
[ "$MEM" -gt 95 ] && echo "⚠️ Memory critical!"
```

## Proactive Actions

**When issues detected:**

| Issue | Auto-Action | Alert? |
|-------|------------|--------|
| Disk > 90% | Clean temp files, old logs | Yes |
| Key process down | Attempt restart | Yes |
| Cron 3+ failures | Generate report | Yes |
| Memory > 95% | List top processes | Yes |

**Auto-fixable (safe):**
```bash
# Clean old logs (> 7 days)
find /var/log -name "*.log" -mtime +7 -delete 2>/dev/null
find ~/.cache -type f -mtime +7 -delete 2>/dev/null

# Clean temp files
rm -f /tmp/agent-temp-* 2>/dev/null
rm -rf ~/.cache/pip 2>/dev/null
```

## Report Format

```markdown
## 🔍 Self-Monitor Report - [TIME]

### Health Summary
| Metric | Value | Status |
|--------|-------|--------|
| Disk | XX% | ✅/⚠️/🔴 |
| Memory | XX% | ✅/⚠️/🔴 |
| Load | X.X | ✅/⚠️/🔴 |
| Services | X/Y up | ✅/⚠️ |

### Issues Found
- [Issue 1]: [Action taken or recommended]

### Top Resource Consumers
| Process | CPU% | MEM% |
|---------|------|------|
| ... | ... | ... |
```

## Integration with Scheduled Tasks

Add to your crontab or task scheduler:
```cron
# Run health check every 30 minutes
*/30 * * * * /path/to/health-check.sh >> /var/log/health-check.log 2>&1
```

Or run manually as part of your workflow:
```bash
./health-check.sh
```


---
Source attribution: meghal86
Original project: https://github.com/meghal86/stacksignal/blob/main/.agents/skills/self-monitor/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: meghal86
Original project: https://github.com/meghal86/stacksignal/blob/main/.agents/skills/self-monitor/SKILL.md
Attribution basis: Source repository record

Fields of work: Development & Engineering, Operations
Roles: DevOps / SRE, IT Operations, Operations Manager
Specialties: DevOps
Tools: Docker
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: 79c49a4e800b9b6f739efbb39e6f58796ccc6dc7080f03d11a8f927df9cf6c57