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fix(profiling): Populate Hermes runtime version on JS profiles - #6817
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The Hermes JS profile payload has always sent an empty `runtime.version` placeholder. Wire it up to the existing `getHermesVersion()` helper so profiles carry the real Hermes version (falling back to `''` when Hermes does not report one, matching the previous behavior). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Semver Impact of This PR⚪ None (no version bump detected) 📋 Changelog PreviewThis is how your changes will appear in the changelog.
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Android (legacy) Performance metrics 🚀
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Contributor
iOS (legacy) Performance metrics 🚀
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| Revision | Plain | With Sentry | Diff |
|---|---|---|---|
| 64630e5+dirty | 3842.70 ms | 1218.11 ms | -2624.60 ms |
| b0d3373+dirty | 3831.75 ms | 1227.29 ms | -2604.46 ms |
| b04af96+dirty | 3818.92 ms | 1219.76 ms | -2599.16 ms |
| 3d31fcf+dirty | 3838.09 ms | 1223.46 ms | -2614.63 ms |
| a0a3177+dirty | 3844.73 ms | 1225.23 ms | -2619.51 ms |
| af33f3b+dirty | 3849.98 ms | 1236.45 ms | -2613.53 ms |
| 09a902f+dirty | 3835.67 ms | 1217.11 ms | -2618.57 ms |
| 5a316ea+dirty | 3820.11 ms | 1211.28 ms | -2608.83 ms |
| acd838e+dirty | 3849.78 ms | 1230.00 ms | -2619.78 ms |
| c2e182c+dirty | 3848.40 ms | 1211.79 ms | -2636.61 ms |
App size
| Revision | Plain | With Sentry | Diff |
|---|---|---|---|
| 64630e5+dirty | 4.98 MiB | 6.46 MiB | 1.49 MiB |
| b0d3373+dirty | 5.15 MiB | 6.68 MiB | 1.53 MiB |
| b04af96+dirty | 4.98 MiB | 6.54 MiB | 1.56 MiB |
| 3d31fcf+dirty | 4.98 MiB | 6.56 MiB | 1.58 MiB |
| a0a3177+dirty | 4.98 MiB | 6.55 MiB | 1.58 MiB |
| af33f3b+dirty | 4.98 MiB | 6.51 MiB | 1.54 MiB |
| 09a902f+dirty | 4.98 MiB | 6.46 MiB | 1.49 MiB |
| 5a316ea+dirty | 4.98 MiB | 6.51 MiB | 1.53 MiB |
| acd838e+dirty | 5.15 MiB | 6.70 MiB | 1.55 MiB |
| c2e182c+dirty | 4.98 MiB | 6.50 MiB | 1.52 MiB |
antonis
marked this pull request as ready for review
October 1, 2026 12:43
Contributor
Android (new) Performance metrics 🚀
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| Revision | Plain | With Sentry | Diff |
|---|---|---|---|
| bf168a4+dirty | 430.60 ms | 459.31 ms | 28.71 ms |
| 0bd8916+dirty | 400.15 ms | 442.72 ms | 42.57 ms |
| a2585ce+dirty | 414.04 ms | 456.83 ms | 42.79 ms |
| 9c84b9a+dirty | 429.26 ms | 448.90 ms | 19.64 ms |
| bc0d8cf+dirty | 407.66 ms | 461.35 ms | 53.69 ms |
| a736b76+dirty | 405.78 ms | 458.74 ms | 52.96 ms |
| 1122a96+dirty | 510.16 ms | 542.00 ms | 31.84 ms |
| 267d3ed+dirty | 424.69 ms | 483.70 ms | 59.01 ms |
| 6177334+dirty | 404.80 ms | 456.74 ms | 51.94 ms |
| 7887847+dirty | 420.47 ms | 460.55 ms | 40.08 ms |
App size
| Revision | Plain | With Sentry | Diff |
|---|---|---|---|
| bf168a4+dirty | 49.74 MiB | 55.09 MiB | 5.35 MiB |
| 0bd8916+dirty | 48.30 MiB | 53.57 MiB | 5.26 MiB |
| a2585ce+dirty | 49.74 MiB | 55.36 MiB | 5.61 MiB |
| 9c84b9a+dirty | 49.74 MiB | 55.36 MiB | 5.62 MiB |
| bc0d8cf+dirty | 48.30 MiB | 53.48 MiB | 5.18 MiB |
| a736b76+dirty | 48.30 MiB | 53.48 MiB | 5.18 MiB |
| 1122a96+dirty | 48.30 MiB | 53.54 MiB | 5.24 MiB |
| 267d3ed+dirty | 48.30 MiB | 53.58 MiB | 5.28 MiB |
| 6177334+dirty | 48.30 MiB | 53.54 MiB | 5.23 MiB |
| 7887847+dirty | 49.74 MiB | 54.81 MiB | 5.07 MiB |
Contributor
iOS (new) Performance metrics 🚀
|
| Revision | Plain | With Sentry | Diff |
|---|---|---|---|
| 6176a94+dirty | 3854.15 ms | 1221.77 ms | -2632.38 ms |
| a636fa4+dirty | 3846.16 ms | 1210.10 ms | -2636.05 ms |
| 4966363+dirty | 3863.07 ms | 1227.19 ms | -2635.88 ms |
| 68672fc+dirty | 3832.22 ms | 1228.29 ms | -2603.93 ms |
| 6acdf1d+dirty | 3835.35 ms | 1218.30 ms | -2617.06 ms |
| 2c735cc+dirty | 1223.33 ms | 1224.38 ms | 1.04 ms |
| d771cd5+dirty | 3841.09 ms | 1224.64 ms | -2616.44 ms |
| ae37560+dirty | 3840.10 ms | 1217.89 ms | -2622.21 ms |
| a858ac3+dirty | 3850.72 ms | 1226.35 ms | -2624.37 ms |
| 57e0069+dirty | 3842.23 ms | 1210.00 ms | -2632.23 ms |
App size
| Revision | Plain | With Sentry | Diff |
|---|---|---|---|
| 6176a94+dirty | 5.15 MiB | 6.68 MiB | 1.53 MiB |
| a636fa4+dirty | 4.98 MiB | 6.55 MiB | 1.57 MiB |
| 4966363+dirty | 5.15 MiB | 6.68 MiB | 1.53 MiB |
| 68672fc+dirty | 5.15 MiB | 6.71 MiB | 1.55 MiB |
| 6acdf1d+dirty | 4.98 MiB | 6.51 MiB | 1.53 MiB |
| 2c735cc+dirty | 3.38 MiB | 4.74 MiB | 1.35 MiB |
| d771cd5+dirty | 4.98 MiB | 6.55 MiB | 1.57 MiB |
| ae37560+dirty | 5.15 MiB | 6.70 MiB | 1.54 MiB |
| a858ac3+dirty | 4.98 MiB | 6.51 MiB | 1.53 MiB |
| 57e0069+dirty | 4.98 MiB | 6.50 MiB | 1.52 MiB |
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📢 Type of change
📜 Description
Hermes JS profiles have always been sent with an empty
runtime.versionplaceholder (version: '', // TODO: get hermes version). This wires that field up to the existinggetHermesVersion()helper, so profiles now carry the real Hermes version that OSS Hermes reports (e.g.for RN 0.76.0).When Hermes doesn't report a version, we fall back to
''— identical to today's behavior — so there is no regression.💡 Motivation and Context
The TODO dates back to the original experimental Hermes profiling PR (#3057, 2023). The
getHermesVersion()helper already existed at that time (#3050) and is the same source already used to populatereact_native_context.hermes_version; it was simply never wired into the profiling payload. This fills a field that has been shipping empty ever since, so the Hermes runtime version now shows up on profiles in Sentry.No related issue existed; found during a repo-wide TODO cleanup pass.
💚 How did you test it?
Added unit tests in
test/profiling/utils.test.tscovering both the populated case (for RN 0.76.0) and the fallback-to-empty case.yarn lintandyarn testfor the profiling suite pass.📝 Checklist
sendDefaultPIIis enabled.🔮 Next steps
🤖 Generated with Claude Code