How can we sample spans based on duration?

[vanand-conga]

[dyladan]

Sampling decisions are made at span start. If you need to sample when a span is finished, I would suggest you create a custom span processor which discards the spans you would not like exported.

[srikanthccv]

This is probably not something language client can do, do you use opentelemetry collector? If so, you could use the samplingprocessor. See this example https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/processor/tailsamplingprocessor/testdata/tail_sampling_config.yaml