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====== The deployment model ======

<mermaid>
flowchart TB
    subgraph Host1["ePDG Server"]
        EPDG["fast-epdg<br/>(VoWiFi gateway)"]
        PLUGIN["/metrics endpoint<br/>:9817"]
        EPDG -.-> PLUGIN
    end

    subgraph Host2["Monitoring server"]
        PROM["Prometheus"]
        GRAF["Grafana"]
        AM["Alertmanager"]
        SNMPTRAP["SNMP Trap Sender<br/>(webhook gateway)"]
        PROM --> GRAF
        PROM --> AM
        AM --> SNMPTRAP
    end

    subgraph Host3["External systems"]
        NMS["Операторская NMS<br/>(HP OpenView /<br/>NetAct / Tivoli)"]
        CHAT["ChatOps<br/>(Telegram / PagerDuty)"]
    end

    PLUGIN -->|HTTP :9817/metrics| PROM
    SNMPTRAP -->|UDP 162| NMS
    AM -->|Webhook| CHAT
</mermaid>

===== Deployment characteristics =====

^ Parameter                  ^ Value                                                         ^
| **Metrics footprint**      | Integrated (~2 MB memory overhead)                            |
| **External dependencies**  | The self-contained ''fast-epdg'' package (rpm)                 |
| **Management**             | ''fast-epdg.service'' systemd                                 |
| **Configuration**          | The ''monitoring'' section in ''fast-epdg.conf''              |
| **Update**                 | Updating the configuration without interrupting operations    |
| **OS**                     | Linux (RHEL/CentOS 8+, Ubuntu 22.04+)                         |
| **Port**                   | 9817 TCP (listening on 0.0.0.0, configurable)                 |
| **Deployment time**        | < 5 minutes (enable the plugin in the config file + restart)  |

===== Accommodation options =====

  * **On-premise** — the plugin runs in the fast-epdg address space, zero resource consumption
  * **Co-located Prometheus** — Prometheus collects metrics from an application running on the same host
  * **Centralized** — a single Prometheus collects from all ePDG nodes