🐛 clear chain after finalize

[mormubis]

Motivation

A memory leak occurs when the detached elements of a click chain are collected.

Changes

This PR frees the current click chain, releasing the memory related to the event targets clicked in the chain.

Test instructions

• Go to https://app.datadoghq.com/rum/list
• Open dev tools
• Navigate to the Memory tab
• Take a heap snapshot
• Click on Set Up Manually
• Click on React
• Close the modal
• Take another heap snapshot
• Compare both snapshots
• Check that there are several buttons (originally from the modal) that are retained in memory due to the click chain

Repeat the same steps with the SDK from this branch.

• Check there are no buttons from the modal retained in memory

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.

[cit-pr-commenter]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	164.30 KiB	164.31 KiB	+9 B	+0.01%	✅
Rum Profiler	5.21 KiB	5.21 KiB	0 B	0.00%	✅
Rum Recorder	19.74 KiB	19.74 KiB	0 B	0.00%	✅
Logs	56.14 KiB	56.14 KiB	0 B	0.00%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	121.57 KiB	121.58 KiB	+9 B	+0.01%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base CPU Time (ms)	Local CPU Time (ms)	𝚫%
RUM - add global context	0.005	0.0044	-12.00%
RUM - add action	0.0121	0.0151	+24.79%
RUM - add error	0.0167	0.0119	-28.74%
RUM - add timing	0.0034	0.0026	-23.53%
RUM - start view	0.0037	0.0036	-2.70%
RUM - start/stop session replay recording	0.0007	0.0008	+14.29%
Logs - log message	0.0161	0.0145	-9.94%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	25.96 KiB	25.45 KiB	-520 B
RUM - add action	49.86 KiB	49.41 KiB	-461 B
RUM - add timing	25.48 KiB	24.07 KiB	-1.42 KiB
RUM - add error	52.24 KiB	54.16 KiB	+1.91 KiB
RUM - start/stop session replay recording	23.53 KiB	23.55 KiB	+21 B
RUM - start view	427.99 KiB	423.44 KiB	-4.55 KiB
Logs - log message	43.83 KiB	43.82 KiB	-13 B

🔗 RealWorld

[datadog-datadog-prod-us1]

⚠️ Tests

⚠️ Warnings

❄️ 1 New flaky test detected

scroll getScrollX/Y normalized scroll updates when scrolled from Chrome 139.0.0.0 (Android 10) (Datadog) (Fix with Cursor)

Error: Expected 100 to be 100.1307144165039.
    at <Jasmine>
    at UserContext.<anonymous> (webpack:///packages/rum-core/src/browser/scroll.spec.ts:46:28 <- /tmp/_karma_webpack_217992/commons.js:74493:75)
    at <Jasmine>

ℹ️ Info

🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 100.00%
• Overall Coverage: 92.63% (+0.00%)

View detailed report

<sub>This comment will be updated automatically if new data arrives.
* Fix with Cursor requires Datadog plugin ≥v2.17.0
🔗 Commit SHA: d7443a9 | Docs | Datadog PR Page | Was this helpful? Give us feedback!</sub>

[mormubis]

/merge

[dd-devflow-routing-codex]

View all feedbacks in Devflow UI.

2025-12-15 15:33:26 UTC ℹ️ Start processing command /merge

---

2025-12-15 15:33:33 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in main is approximately 52m (p90).

---

2025-12-15 15:59:25 UTC ℹ️ MergeQueue: This merge request was merged