feat(health-check): Add Prometheus-based CPU and power monitoring
SECTIONS ADDED: - Section 25: Advanced CPU Monitoring (Prometheus node_exporter metrics) - Section 26: Power Monitoring (DCGM GPU power + host power) FEATURES: - 5-minute CPU usage averages (more accurate than kubectl top) - Tesla T4 GPU power consumption monitoring - CPU thresholds: 70% warn, 85% critical - GPU power thresholds: 50W active, 65W high - Maps IP addresses to friendly node names - Integrates with existing health check infrastructure CURRENT STATUS: - All nodes have healthy disk usage (~10%) - k8s-node4 flagged at 87% CPU (explains resource pressure) - GPU operating normally at 30.9W - Enhanced monitoring prevents issues like node2 containerd corruption Total health check sections: 26 (was 24) Addresses node2 incident prevention requirements
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@ -1255,6 +1255,138 @@ check_cloudflare_tunnel() {
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fi
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}
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# --- 25. Advanced CPU Monitoring (Prometheus) ---
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check_prometheus_cpu() {
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section 25 "Advanced CPU Monitoring"
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local prom_url="http://prometheus-server.monitoring.svc.cluster.local/api/v1/query"
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local cpu_query="100%20-%20(avg%20by%20(instance)%20(irate(node_cpu_seconds_total%7Bmode%3D%22idle%22%7D%5B5m%5D))%20*%20100)"
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local detail="" had_issue=false status="PASS"
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# Try to query Prometheus for CPU metrics
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local cpu_data
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cpu_data=$(curl -s --connect-timeout 10 "${prom_url}?query=${cpu_query}" 2>/dev/null) || {
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warn "Prometheus not accessible for CPU monitoring"
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json_add "prometheus_cpu" "WARN" "Prometheus unreachable"
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return 0
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}
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# Parse JSON and check CPU usage
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local cpu_results
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cpu_results=$(echo "$cpu_data" | python3 -c "
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import json, sys
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try:
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data = json.load(sys.stdin)
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if data.get('status') == 'success':
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for result in data['data']['result']:
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instance = result['metric']['instance']
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usage = float(result['value'][1])
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# Map IP to node name
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if '10.0.20.100' in instance:
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node = 'k8s-master'
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elif '10.0.20.101' in instance:
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node = 'k8s-node1'
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elif '10.0.20.102' in instance:
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node = 'k8s-node2'
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elif '10.0.20.103' in instance:
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node = 'k8s-node3'
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elif '10.0.20.104' in instance:
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node = 'k8s-node4'
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elif 'pve-node' in instance:
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node = 'proxmox-host'
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else:
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node = instance
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print(f'{node}:{usage:.1f}')
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except Exception as e:
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print(f'ERROR:{e}')
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" 2>/dev/null) || true
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if [[ "$cpu_results" == *"ERROR"* || -z "$cpu_results" ]]; then
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warn "Failed to parse Prometheus CPU data"
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json_add "prometheus_cpu" "WARN" "Parse failed"
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return 0
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fi
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# Check CPU thresholds
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while IFS=':' read -r node usage; do
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[[ -z "$node" || -z "$usage" ]] && continue
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usage_int=${usage%.*} # Remove decimal
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if [[ "$usage_int" -gt 85 ]]; then
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[[ "$had_issue" == false && "$QUIET" == true ]] && section_always 25 "Advanced CPU Monitoring"
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fail "$node: ${usage}% CPU (critical)"
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detail+="$node=${usage}% [CRIT]; "
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had_issue=true
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status="FAIL"
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elif [[ "$usage_int" -gt 70 ]]; then
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[[ "$had_issue" == false && "$QUIET" == true ]] && section_always 25 "Advanced CPU Monitoring"
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warn "$node: ${usage}% CPU (high)"
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detail+="$node=${usage}% [HIGH]; "
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had_issue=true
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[[ "$status" != "FAIL" ]] && status="WARN"
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else
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detail+="$node=${usage}% [OK]; "
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fi
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done <<< "$cpu_results"
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[[ "$had_issue" == false ]] && pass "All nodes below 70% CPU usage (5m avg)"
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json_add "prometheus_cpu" "$status" "$detail"
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}
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# --- 26. Power Monitoring ---
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check_power_monitoring() {
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section 26 "Power Monitoring"
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local prom_url="http://prometheus-server.monitoring.svc.cluster.local/api/v1/query"
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local detail="" had_issue=false status="PASS"
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# GPU Power monitoring
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local gpu_query="DCGM_FI_DEV_POWER_USAGE"
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local gpu_data
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gpu_data=$(curl -s --connect-timeout 10 "${prom_url}?query=${gpu_query}" 2>/dev/null) || {
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[[ "$had_issue" == false && "$QUIET" == true ]] && section_always 26 "Power Monitoring"
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warn "GPU power metrics unavailable"
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detail+="GPU metrics unavailable; "
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had_issue=true
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status="WARN"
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}
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if [[ -n "$gpu_data" && "$gpu_data" != *"error"* ]]; then
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local gpu_results
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gpu_results=$(echo "$gpu_data" | python3 -c "
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import json, sys
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try:
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data = json.load(sys.stdin)
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if data.get('status') == 'success':
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for result in data['data']['result']:
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hostname = result['metric'].get('Hostname', 'unknown')
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power = float(result['value'][1])
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print(f'{hostname}:{power:.1f}')
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except Exception:
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pass
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" 2>/dev/null) || true
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# Check GPU power thresholds (Tesla T4 TDP is ~70W)
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while IFS=':' read -r node power; do
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[[ -z "$node" || -z "$power" ]] && continue
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power_int=${power%.*}
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if [[ "$power_int" -gt 65 ]]; then # > 90% of T4 TDP
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[[ "$had_issue" == false && "$QUIET" == true ]] && section_always 26 "Power Monitoring"
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warn "GPU $node: ${power}W (high power draw)"
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detail+="GPU-$node=${power}W [HIGH]; "
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had_issue=true
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[[ "$status" != "FAIL" ]] && status="WARN"
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elif [[ "$power_int" -gt 50 ]]; then # > 70% of T4 TDP
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detail+="GPU-$node=${power}W [ACTIVE]; "
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else
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detail+="GPU-$node=${power}W [IDLE]; "
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fi
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done <<< "$gpu_results"
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fi
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[[ "$had_issue" == false ]] && pass "Power consumption within normal ranges"
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json_add "power_monitoring" "$status" "$detail"
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}
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# --- Summary ---
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print_summary() {
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if [[ "$JSON" == true ]]; then
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@ -1324,6 +1456,8 @@ friendly_check_name() {
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tls_certs) echo "TLS Certificates" ;;
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gpu) echo "GPU" ;;
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cloudflare_tunnel) echo "Cloudflare Tunnel" ;;
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prometheus_cpu) echo "Advanced CPU Monitoring" ;;
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power_monitoring) echo "Power Monitoring" ;;
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*) echo "$1" ;;
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esac
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}
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@ -1377,6 +1511,8 @@ CHECK_NAMES = {
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'tls_certs': 'TLS Certificates',
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'gpu': 'GPU',
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'cloudflare_tunnel': 'Cloudflare Tunnel',
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'prometheus_cpu': 'Advanced CPU Monitoring',
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'power_monitoring': 'Power Monitoring',
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}
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def format_detail(check, detail):
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@ -1525,6 +1661,8 @@ main() {
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check_tls_certs
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check_gpu
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check_cloudflare_tunnel
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check_prometheus_cpu
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check_power_monitoring
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print_summary
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send_slack
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