type Sampler … type SamplingParameters … type SamplingDecision … const Drop … const RecordOnly … const RecordAndSample … type SamplingResult … type traceIDRatioSampler … func (ts traceIDRatioSampler) ShouldSample(p SamplingParameters) SamplingResult { … } func (ts traceIDRatioSampler) Description() string { … } // TraceIDRatioBased samples a given fraction of traces. Fractions >= 1 will // always sample. Fractions < 0 are treated as zero. To respect the // parent trace's `SampledFlag`, the `TraceIDRatioBased` sampler should be used // as a delegate of a `Parent` sampler. // //nolint:revive // revive complains about stutter of `trace.TraceIDRatioBased` func TraceIDRatioBased(fraction float64) Sampler { … } type alwaysOnSampler … func (as alwaysOnSampler) ShouldSample(p SamplingParameters) SamplingResult { … } func (as alwaysOnSampler) Description() string { … } // AlwaysSample returns a Sampler that samples every trace. // Be careful about using this sampler in a production application with // significant traffic: a new trace will be started and exported for every // request. func AlwaysSample() Sampler { … } type alwaysOffSampler … func (as alwaysOffSampler) ShouldSample(p SamplingParameters) SamplingResult { … } func (as alwaysOffSampler) Description() string { … } // NeverSample returns a Sampler that samples no traces. func NeverSample() Sampler { … } // ParentBased returns a sampler decorator which behaves differently, // based on the parent of the span. If the span has no parent, // the decorated sampler is used to make sampling decision. If the span has // a parent, depending on whether the parent is remote and whether it // is sampled, one of the following samplers will apply: // - remoteParentSampled(Sampler) (default: AlwaysOn) // - remoteParentNotSampled(Sampler) (default: AlwaysOff) // - localParentSampled(Sampler) (default: AlwaysOn) // - localParentNotSampled(Sampler) (default: AlwaysOff) func ParentBased(root Sampler, samplers ...ParentBasedSamplerOption) Sampler { … } type parentBased … func configureSamplersForParentBased(samplers []ParentBasedSamplerOption) samplerConfig { … } type samplerConfig … type ParentBasedSamplerOption … // WithRemoteParentSampled sets the sampler for the case of sampled remote parent. func WithRemoteParentSampled(s Sampler) ParentBasedSamplerOption { … } type remoteParentSampledOption … func (o remoteParentSampledOption) apply(config samplerConfig) samplerConfig { … } // WithRemoteParentNotSampled sets the sampler for the case of remote parent // which is not sampled. func WithRemoteParentNotSampled(s Sampler) ParentBasedSamplerOption { … } type remoteParentNotSampledOption … func (o remoteParentNotSampledOption) apply(config samplerConfig) samplerConfig { … } // WithLocalParentSampled sets the sampler for the case of sampled local parent. func WithLocalParentSampled(s Sampler) ParentBasedSamplerOption { … } type localParentSampledOption … func (o localParentSampledOption) apply(config samplerConfig) samplerConfig { … } // WithLocalParentNotSampled sets the sampler for the case of local parent // which is not sampled. func WithLocalParentNotSampled(s Sampler) ParentBasedSamplerOption { … } type localParentNotSampledOption … func (o localParentNotSampledOption) apply(config samplerConfig) samplerConfig { … } func (pb parentBased) ShouldSample(p SamplingParameters) SamplingResult { … } func (pb parentBased) Description() string { … }
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