Envoy & otel tracing samplers

[dormullor]

Hello everyone,
As far as i know, the default envoy OTEL sampler is "always_on", means, it will send a span for every request.
Since we use OTEL library on other services like nginx for example. i would like to set the nginx to a ratio based sampler and then envoy and all other services will use the "parentbased_always_off". ( if a trace exist, send a span, if not, do nothing )

https://opentelemetry.io/docs/languages/sdk-configuration/general/#otel_traces_sampler

Is there a way to configure other samplers in envoy ?

[htuch]

@wbpcode @Shikugawa @basvanbeek

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