Multiple ChoiceIntermediate 45s
Tail sampling versus head sampling
Why is tail-based sampling often preferred for distributed tracing?
Options
- 1It samples before the request starts, so the decision is fixed up front and cannot be revised based on how the request behaves
- 2It reduces metric cardinality by collapsing per-trace dimensions into a fixed set of tags before the trace is emitted
- 3It eliminates the need for trace IDs, since the sampler can reconstruct the causal path from span timing once a trace is kept
- 4It decides after the request completes, so it can keep all traces with errors or high latency while discarding routine ones
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