Parent-based sampler that defers to parent's sampling decision.

This sampler makes decisions based on the parent span's sampling state: - If parent is sampled, child is sampled - If parent is not sampled, child is not sampled - If no parent (root span), delegates to a configurable root sampler

Configuration

- root: Sampler for root spans (default: instrument_sampler_always_on) - root_config: Configuration for root sampler (default: #{}) - remote_parent_sampled: Sampler when remote parent is sampled (default: always_on) - remote_parent_not_sampled: Sampler when remote parent is not sampled (default: always_off) - local_parent_sampled: Sampler when local parent is sampled (default: always_on) - local_parent_not_sampled: Sampler when local parent is not sampled (default: always_off)

Example

  instrument_sampler:set_sampler(instrument_sampler_parent_based, #{
    root => instrument_sampler_probability,
    root_config => #{ratio => 0.1}
  }).