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GitHub Events Service Architecture

flowchart LR
    subgraph GitHub Cloud
        GH[GitHub Webhooks]
    end

    subgraph Internet
        DNS[DNS: github-events.cncf.io -> Reserved IP]
    end

    subgraph "Oracle Cloud (OCI)"
        subgraph Cluster Network
            LBService[Ingress Controller Service\n(type=LoadBalancer, loadBalancerIP=Reserved IP)]
            Ingress[Ingress-NGINX Controller]
            Service[maintainerd Service\n(ClusterIP)]
            Pod[maintainerd Pod]
        end
        subgraph MetalLB System
            Pool[IPAddress Pool\ncontains Reserved IP]
            Speakers[Speaker Pods\nannounce IP via BGP/ARP]
        end
    end

    GH -->|HTTPS webhook| DNS --> LBService
    LBService -->|requests IP| Pool
    Speakers -->|advertise IP| Internet
    LBService --> Ingress --> Service --> Pod
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Flow Summary

  • GitHub delivers webhook events to github-events.cncf.io.
  • DNS resolves the hostname to the reserved OCI public IP.
  • The ingress controller Service is configured with loadBalancerIP=<reserved-ip>, so MetalLB binds that address.
  • MetalLB speakers advertise the IP; traffic enters the cluster via the ingress controller.
  • The ingress routes traffic to the internal maintainerd Service (ClusterIP) and on to the pod.