Monitoring

Overview

NodePrism uses a Prometheus-based monitoring stack:

Component	Purpose	Port
Prometheus	Metrics collection & storage	9090
Grafana	Visualization & dashboards	3030
Loki	Log aggregation	3100
AlertManager	Alert routing	9093

Agent Types

Agent	Port	Metrics
NODE_EXPORTER	9100	CPU, memory, disk, network
MYSQL_EXPORTER	9104	MySQL server metrics
POSTGRES_EXPORTER	9187	PostgreSQL metrics
MONGODB_EXPORTER	9216	MongoDB metrics
NGINX_EXPORTER	9113	Nginx metrics
APACHE_EXPORTER	9117	Apache metrics
PROMTAIL	9080	Log shipping to Loki
APP_AGENT	9101	Custom application metrics

Collected Metrics

System Metrics (node_exporter)

Metric	Description
node_cpu_seconds_total	CPU time spent in each mode
node_memory_MemAvailable_bytes	Available memory
node_memory_MemTotal_bytes	Total memory
node_filesystem_avail_bytes	Available disk space
node_filesystem_size_bytes	Total disk size
node_load1	1-minute load average
node_load5	5-minute load average
node_load15	15-minute load average
node_network_receive_bytes_total	Network bytes received
node_network_transmit_bytes_total	Network bytes sent

Alert Rules

Default alert rules in infrastructure/docker/prometheus/alerts.yml:

Alert	Condition	Severity
InstanceDown	up == 0 for 5m	Critical
HighCPUUsage	CPU > 80% for 2m	Warning
HighLoadAverage	load1 > 10 for 2m	Warning
CriticalLoadAverage	load1 > 50 for 1m	Critical
HighMemoryUsage	Memory > 80% for 2m	Warning
LowDiskSpace	Disk > 80% for 2m	Warning
CriticalDiskSpace	Disk > 95% for 2m	Critical

Prometheus Queries

CPU Usage

100 - (avg by(instance) (irate(node_cpu_seconds_total{mode="idle"}[5m])) * 100)

Memory Usage

(1 - (node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes)) * 100

Disk Usage

(1 - (node_filesystem_avail_bytes / node_filesystem_size_bytes)) * 100

Network Throughput

irate(node_network_receive_bytes_total[5m])
irate(node_network_transmit_bytes_total[5m])

Grafana Dashboards

Access Grafana at http://localhost:3030

Default credentials:

• Username: admin
• Password: admin123