Architecture of the monitoring system

Four-level monitoring architecture

Level	Component	Technology
Collection	Built-in /metrics endpoint fast-epdg	Prometheus text format over HTTP
Storage	Prometheus TSDB	Local storage, 15-day storage by default
Visualization	Grafana + JSON support	Autodownload 4 dashboards
Alerting	Alertmanager + SNMP Trap Sender	PromQL rules → webhook → SNMP v2c trap