add 'emit' column-numbers mode using pprof-format Line.column

[szegedi]

What does this PR do?:
Adds a new 'emit' value to the columnNumbers option (alongside the existing 'drop' and 'pack'). In 'emit' mode the serializer records the frame's column in the dedicated pprof Line.column field rather than packing it into the high 32 bits of the line field. This requires pprof-format >= 2.3.0 (the version that added Line.column), so the dependency is bumped from ^2.2.1 to ^2.3.0.

Like 'pack', 'emit' only carries a column for frames whose source map was declared but is missing locally — i.e. exactly the frames bound for server-side unminification (the same condition that sets dd:has-missing-map-files). Locally-resolved frames keep a plain line and no column, so column data never reaches profiles that skip server-side unminification.

Motivation:
Server-side deobfuscation of minified Node.js/Next.js profiles needs the column number to discriminate between functions on a single (bundled) line. The existing 'pack' mode encodes the column into the line field, but that produces a non-standards-compliant line value. 'emit' keeps the two concerns cleanly separated: the pprof file carries a real Line.column, and the Datadog backend does the column << 32 | line packing itself for Node.js profiles when it consumes the column field. The backend-side column parsing/packing has already landed.

Additional Notes:
'drop' remains the default, so existing consumers are unaffected. This is purely additive.

How to test the change?:
Covered by unit tests in ts/test/test-profile-serializer.ts:

• 'emit' populates the real Line.column field and keeps the line plain for a frame with a missing source map.
• 'emit' carries no column for a frame with no missing map.

Full serializer suite: 24 passing. gts check clean (one pre-existing unrelated warning in otel-thread-ctx.ts).

Jira: PROF-15672

[github-actions]

Overall package size

Self size: 2.45 MB
Deduped: 3.16 MB
No deduping: 3.16 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | pprof-format | 2.3.0 | 503.97 kB | 503.97 kB | | source-map | 0.8.0 | 185.66 kB | 185.66 kB | | node-gyp-build | 4.8.4 | 13.86 kB | 13.86 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[datadog-prod-us1-5]

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DataDog/apm-reliability/pprof-nodejs | benchmarks-pr-comment     

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