Datadog spans explosion after v1.53.x

[davidegreenwald]

Describe the bug

We use the Inigo build of the router and recently upgraded from v0.30.11 to 0.30.15 (bringing us from router 1.53.x to 1.57.1).

The Datadog changes across these versions appear to have exploded our span count in Datadog. The router appears to be ignoring the sampling rates on its upstream, parent services which it was previously respecting and is now ingesting all spans. This has lifted our ingest by 100x and will have a cost impact on our Datadog contract.

We're using the Datadog trace exporter: https://www.apollographql.com/docs/graphos/reference/router/telemetry/trace-exporters/datadog

Expected behavior

There should be no change in trace levels from these upgrades.

Additional context

Happy to give you any further information we can here.