With opentracing, APICast generates multiple spans with the shared traceID:

• Span 1: Operation name: "apicast"
  • Span 1.1: Operation name: /
  • Span 1.2: Operation name: "@upstream"
  • Span 1.3: Operation name: "@out_of_band_authrep_action"

See image as example

Whereas opentelemetry, APICast only generates 1 span

• Span 1: Operation name: "apicast"

See image as example

The main purpose is provide details about time taken to perform upstream and backend actions