Hi, I'm Vicki Stanfield

#!/usr/bin/env python3
"""
System Health Check
Reports CPU, memory, and disk usage as JSON and exits non-zero when any
metric crosses its threshold, so cron and monitoring tools can act on it.
"""

import argparse
import json
import sys
from datetime import datetime, timezone

import psutil


def get_system_health(path="/"):
    """Gather system health metrics (one call per source)."""
    mem = psutil.virtual_memory()
    disk = psutil.disk_usage(path)
    return {
        "timestamp": datetime.now(timezone.utc).isoformat(),
        "cpu_percent": psutil.cpu_percent(interval=1),
        "memory": {
            "total": mem.total,
            "available": mem.available,
            "percent": mem.percent,
        },
        "disk": {
            "path": path,
            "total": disk.total,
            "used": disk.used,
            "percent": disk.percent,
        },
    }


def check_thresholds(health, cpu_max=80, mem_max=85, disk_max=90):
    """Return an alert message for every metric over its threshold."""
    checks = [
        ("CPU", health["cpu_percent"], cpu_max),
        ("Memory", health["memory"]["percent"], mem_max),
        (f"Disk {health['disk']['path']}", health["disk"]["percent"], disk_max),
    ]
    return [
        f"{name} usage {value:.1f}% exceeds {limit}%"
        for name, value, limit in checks
        if value > limit
    ]


def main():
    parser = argparse.ArgumentParser(description="System health check")
    parser.add_argument("--path", default="/", help="filesystem to check")
    parser.add_argument("--cpu-max", type=float, default=80)
    parser.add_argument("--mem-max", type=float, default=85)
    parser.add_argument("--disk-max", type=float, default=90)
    args = parser.parse_args()

    health = get_system_health(args.path)
    print(json.dumps(health, indent=2))

    alerts = check_thresholds(health, args.cpu_max, args.mem_max, args.disk_max)
    for alert in alerts:
        print(f"ALERT: {alert}", file=sys.stderr)
    return 1 if alerts else 0


if __name__ == "__main__":
    sys.exit(main())