health-check

System Health Check

Periodic system health check delivered via the C4 Control queue.

When to Use

• Receiving a control message with "health-check" in the content
• The activity monitor enqueues this automatically at regular intervals

Steps

1. Check PM2 Services

pm2 jlist

Parse the JSON output. Every service should have status: "online". Record which services are stopped or errored.

2. Check Disk Space

df -h / /home 2>/dev/null || df -h /

Thresholds:

• OK: < 80% used
• Warning: 80-90% used
• Critical: > 90% used

3. Check Memory

free -m

Thresholds:

• OK: < 80% used
• Warning: 80-90% used
• Critical: > 90% used (or swap > 50% used)

4. Report Results

If all checks pass, log to ~/zylos/logs/health.log:

[YYYY-MM-DD HH:MM:SS] Health Check: PM2 X/X online, Disk XX%, Memory XX% - ALL OK

If any issues found, notify whoever is most likely to help:

1. Check your memory files for a designated owner or ops person
2. If none designated, notify the person you normally work with most
3. Use c4-send.js with the appropriate channel and endpoint to send the alert

Issue Resolution

| Issue | Action | |-------|--------| | PM2 service stopped | pm2 restart <service> and report | | High disk usage | Check logs directories, report findings | | High memory / swap | Report findings, check for runaway processes |