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The Grafana heatmap of 1s and 0s said almost nothing, and the state timeline
was an unreadable pile of overlapping series labels. Replaced as the primary
view with a purpose-built page served by the exporter itself.
- Probe now captures ICMP RTT, exposed as labsim_rtt_ms{src,dst}. A path that
is up but slow is a different problem from one that is down, and a pass/fail
grid cannot show it.
- Exporter serves / (topology), /api/matrix (JSON) and /metrics.
- topology.html: node per VLAN in a ring, VyOS router in the centre because
every inter-VLAN packet really does traverse it, one line per pair coloured
green/red with the RTT on it. Hovering gives per-direction state. A node ring
goes red if anything to or from it is blocked. Side panels list blocked paths
and the slowest links. Refreshes every 5s, no dependencies.
Grafana stays for what it is actually good at — history of when a path flipped.
Label placement is deliberate: RTT captions sit ~32% along each edge with a
perpendicular nudge, because every diagonal of a 6-node mesh crosses the centre
and midpoint labels stack on the router node.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DMVzWZgiKW2wquf5z8S1yH