telemetry

telemetry counts datagrams and bytes with the global OpenTelemetry meter provider configured in the top level telemetry section, then continues the chain.

server:
  udp:
    middlewares:
      metrics:
        telemetry:
          name: dns
    routers:
      dns:
        entrypoints: [dns]
        middlewares: [metrics, resolver]

Field	Default	Description
name	middleware name	Value of the name attribute.

Metric	Type	Description
turna.udp.packets	counter	Received datagrams.
turna.udp.received	counter (By)	Received bytes.

Place it first in the router so dropped datagrams are counted too.