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Document that head sampling is intentionally fixed at 100% and no longer exposes a sampling_ratio config knob. A per-node ratio let nodes make divergent keep/drop decisions for the same distributed trace, producing broken/partial traces; pinning at 1.0 with a ParentBased sampler keeps decisions coherent across the network. Volume reduction is delegated to collector-side tail sampling. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>