<mermaid> flowchart LR
EXP["fast-epdg<br/>/metrics :9817"]
EXP --> CFG["Config<br/>2 metrics"] EXP --> NET["Network<br/>1 metric"] EXP --> PROTO["Protocols L5-L7<br/>15 metrics"] EXP --> SVC["Service KPI<br/>4 metrics"] EXP --> SESS["Session State<br/>4 metrics"] EXP --> APP["Application<br/>3 metrics"] EXP --> SYS["System<br/>4 metrics"]
PROTO --> IKEV2["IKEv2<br/>SWu — 3"] PROTO --> GTPC["GTPv2-C<br/>S2b — 4"] PROTO --> GTPU["GTP-U<br/>S2b data — 3"] PROTO --> DIA["Diameter<br/>SWm/SWx/S6b — 5"]
</mermaid>
| Category | Number of metrics | Survey interval | Key indicators |
|---|---|---|---|
| Config | 2 | 10 sec | Configuration status, reload counter |
| Network | 1 | 10 sec | Node connection status (PGW/AAA/HSS) |
| IKEv2 (SWu) | 3 | 10 sec | Reports by type (IKE_SA_INIT, IKE_AUTH, CREATE_CHILD_SA), delay diagram, errors |
| GTPv2-C (S2b) | 4 | 10 sec | Messages (Create/Modify/Delete Session), delays, errors, relays |
| GTP-U data plane | 3 | 10 sec | Packets/bytes, tunneling errors |
| Diameter (SWm/SWx/S6b) | 5 | 10 sec | Command code messages (DER/DEA, MAR/MAA, AAR/AAA), delays, errors, watchdog, connection status |
| Service KPI | 4 | 10 sec | Percentage of successful attempts, duration histogram, service availability, uptime |
| Session State | 4 | 10 sec | IKE SA, Child SA, GTP sessions, all users |
| Application | 3 | 10 sec | Number of streams, memory, log messages by levels |
| System | 4 | 10 sec | CPU recycling, memory, memory disposal, open FD |
| Total | 33 metrics |
All metrics have the prefix epdg_ and are organized in a hierarchy:
epdg_ ├── config_* # Configuration ├── network_* # Network layer ├── ikev2_* # SWu (IKEv2/IPSec) ├── gtp_* # S2b control-plane GTPv2-C ├── gtpu_* # S2b data-plane GTP-U ├── diameter_* # SWm/SWx/S6b ├── service_* # Service KPIs (attach, availability, uptime) ├── session_* # Session Status (IKE SA, Child SA, GTP, subscribers) ├── app_* # App Metrics (memory, threads, logs) └── system_* # System metrics (CPU, disk, network)