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fix(llmobs): send batches of span events #5493

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@lievan lievan commented Mar 27, 2025

What does this PR do?

Update spans to be sent as a batch of events. Each event contains one span, allowing us to send spans up to 1MB (the event size limit).

Motivation

This was a limit we assumed previously, but we were actually under a 1MB limit per payload/batch of spans limit since the payload we sent to EVP intake was being treated as a single event.

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codecov bot commented Mar 27, 2025

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.23%. Comparing base (762e2cf) to head (5d52cbd).
Report is 1 commits behind head on master.

Files with missing lines Patch % Lines
packages/dd-trace/src/llmobs/writers/spans/base.js 0.00% 1 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##           master    #5493      +/-   ##
==========================================
- Coverage   79.27%   79.23%   -0.05%     
==========================================
  Files         513      513              
  Lines       23184    23137      -47     
==========================================
- Hits        18379    18332      -47     
  Misses       4805     4805              

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pr-commenter bot commented Mar 27, 2025

Benchmarks

Benchmark execution time: 2025-03-27 15:30:23

Comparing candidate commit 5d52cbd in PR branch evan.li/batch-span-events with baseline commit 762e2cf in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 950 metrics, 13 unstable metrics.

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Overall package size

Self size: 9.11 MB
Deduped: 101.64 MB
No deduping: 102.16 MB

Dependency sizes | name | version | self size | total size | |------|---------|-----------|------------| | @datadog/libdatadog | 0.5.0 | 29.83 MB | 29.83 MB | | @datadog/native-appsec | 8.5.1 | 19.26 MB | 19.27 MB | | @datadog/native-iast-taint-tracking | 3.3.0 | 13.77 MB | 13.78 MB | | @datadog/pprof | 5.6.0 | 9.79 MB | 10.16 MB | | @opentelemetry/core | 1.30.1 | 908.66 kB | 7.16 MB | | protobufjs | 7.4.0 | 2.77 MB | 5.42 MB | | @datadog/native-iast-rewriter | 2.8.0 | 2.6 MB | 2.74 MB | | @datadog/native-metrics | 3.1.0 | 1.06 MB | 1.46 MB | | @opentelemetry/api | 1.8.0 | 1.21 MB | 1.21 MB | | import-in-the-middle | 1.13.1 | 117.64 kB | 839.26 kB | | source-map | 0.7.4 | 226 kB | 226 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | lru-cache | 7.18.3 | 133.92 kB | 133.92 kB | | pprof-format | 2.1.0 | 111.69 kB | 111.69 kB | | @datadog/sketches-js | 2.1.1 | 109.9 kB | 109.9 kB | | lodash.sortby | 4.7.0 | 75.76 kB | 75.76 kB | | ignore | 5.3.2 | 53.63 kB | 53.63 kB | | istanbul-lib-coverage | 3.2.0 | 29.34 kB | 29.34 kB | | rfdc | 1.4.1 | 27.15 kB | 27.15 kB | | @isaacs/ttlcache | 1.4.1 | 25.2 kB | 25.2 kB | | tlhunter-sorted-set | 0.1.0 | 24.94 kB | 24.94 kB | | dc-polyfill | 0.1.6 | 24.56 kB | 24.56 kB | | shell-quote | 1.8.2 | 23.54 kB | 23.54 kB | | limiter | 1.1.5 | 23.17 kB | 23.17 kB | | retry | 0.13.1 | 18.85 kB | 18.85 kB | | semifies | 1.0.0 | 15.84 kB | 15.84 kB | | jest-docblock | 29.7.0 | 8.99 kB | 12.76 kB | | crypto-randomuuid | 1.0.0 | 11.18 kB | 11.18 kB | | ttl-set | 1.0.0 | 4.61 kB | 9.69 kB | | path-to-regexp | 0.1.12 | 6.6 kB | 6.6 kB | | koalas | 1.0.2 | 6.47 kB | 6.47 kB | | module-details-from-path | 1.0.3 | 4.47 kB | 4.47 kB |

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

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Datadog Report

Branch report: evan.li/batch-span-events
Commit report: 07f5d83
Test service: dd-trace-js-integration-tests

✅ 0 Failed, 920 Passed, 0 Skipped, 12m 42.61s Total Time

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