Spanport
One OTLP key. Policy fan-out to your Langfuse, Phoenix, or generic backends — built for agents that call other agents.
Spanport is the pipe, not another tracer UI. Spans pass through auth, swarm-aware policy, and dual-write — then leave.
Keep Langfuse for prod, Phoenix for eval, Tempo when you only need the graph — same instrumentation.
langfuse · phoenix · braintrust · otlp_generic → tempo / honeycomb / grafana
When fleets call fleets, trees lie. Spanport correlates handoffs without merging payload ownership across trust boundaries.
The peer-pipe idea — a dedicated corridor between swarms — lives as product vocabulary (and reserved Peerpipe domains). The company brand stays Spanport.