Hubble UI (external link)

Fabric and FluxVM do not implement Cilium-native VM endpoints or an in-tree Hubble UI. VMs remain FluxVM edge endpoints (mode = ebpf|cilium coexistence); Cilium owns cluster workloads.

When you already run Hubble elsewhere, point Fabric at it:

[network]
bridge = "vmbr0"
hubble_ui_url = "https://hubble.example.com"

When set, the Edge Dataplane page shows Open Hubble (new tab). This is a convenience link only — no map sync, no CEP ownership.

For VM-edge observe (FluxVM-native), use Edge Dataplane → Packet flow (Colorful / Normal) or GET /api/dataplane/hubble/flows.

fabricctl dataplane hubble --style color
fabricctl dataplane hubble --style plain
fabricctl dataplane hubble --style json   # or: -o json

This is Hubble-lite from FluxVM (guest → tap → tc/eBPF → uplink → peer), not Cilium Hubble gRPC. Pair with the FluxVM feat/hubble-packet-flow PR so hops are populated; otherwise Fabric still draws a path from sampled per-VM flows.