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Build injected header values as ASCII bytes, starting with traceparent - #13182

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dougqh wants to merge 9 commits into

dougqh/kafka-inject-dedup-probefrom

dougqh/ascii-value-builder

Draft

Build injected header values as ASCII bytes, starting with traceparent#13182
dougqh wants to merge 9 commits into
dougqh/kafka-inject-dedup-probefrom
dougqh/ascii-value-builder

Commits on Nov 3, 2026
- Add a builder for ASCII carrier values built as bytes
  
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  c1ce609
- Let Kafka headers take ASCII values as built bytes
  
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  55dc1e8
- Build the injected W3C traceparent as ASCII bytes
  
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  a69df61
- Flag hidden costs at API boundaries in perf review
  
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  cb93324
- Write decimal carrier values straight into ASCII bytes
  
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  8a87055
- Let a carrier setter take an ASCII value as bytes
  
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  4a0c8b4
- Inject the Datadog ids and sampling priority as ASCII bytes
  
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  b2a0cd7
- Benchmark injecting for a new trace and for a child span, not just one reused span
  
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  0a58312
- Point the perf review boundary check at AsciiDecimal too
  
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  73dee01