✨ Add monitorPromise and migrate .catch(monitorError) call sites

[BenoitZugmeyer]

Motivation

Promise rejections from SDK-internal async work (session persistence, fetch pipelines, remote configuration, profiling) are currently routed to telemetry via .catch(monitorError). This pattern has two gaps that block the upcoming monitor-context-propagation rework:

• It can't capture the SDK context at call time, so once the context mechanism lands, rejections firing asynchronously would have no active context and wouldn't route to the originating SDK's telemetry.
• Sites that wrap the error in a descriptive new Error(...) require a custom .catch handler, fragmenting the pattern.

Changes

• Add monitorPromise to the Monitor interface in @datadog/js-core/monitor: reports a rejection to telemetry and swallows it (resolves to undefined), mirroring callMonitored's on-throw return. An optional mapError argument transforms the rejection before reporting, replacing the custom .catch handlers that wrapped errors in descriptive messages.
• Migrate all 19 .catch(monitorError) call sites across browser-core, browser-rum-core, browser-rum, and browser-logs to monitorPromise(...), including the two wrapped-error sites.
• Allow monitorPromise as a known-safe floating call in the @typescript-eslint/no-floating-promises lint rule, so terminal call sites read naturally without a void prefix.
• Re-export monitorPromise through @datadog/browser-core.

This is an additive, behavior-preserving change: today monitorPromise is just promise.catch(monitorError). It lays the groundwork so the later context-aware version can capture the active SDK context at call time without touching call sites again.

Test instructions

• Run the sandbox (yarn dev) and trigger an async code path that rejects (e.g. block the intake endpoint so a fetch rejects, or force a session-store write failure). Confirm the rejection is still reported to telemetry and does not surface as an unhandled rejection in the console.
• With debug mode enabled (debug: true in the init config), confirm rejected-promise errors still log [MONITOR] ... to the console.

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.
• Updated documentation and/or relevant AGENTS.md file

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	181.52 KiB	181.54 KiB	+24 B	+0.01%	✅
Rum Profiler	8.43 KiB	8.43 KiB	-6 B	-0.07%	✅
Rum Recorder	22.31 KiB	22.31 KiB	0 B	0.00%	✅
Logs	57.63 KiB	57.63 KiB	-1 B	-0.00%	✅
Rum Salesforce	N/A	139.59 KiB	N/A	N/A	N/A
Rum Slim	139.59 KiB	139.59 KiB	-2 B	-0.00%	✅
Worker	22.96 KiB	22.96 KiB	0 B	0.00%	✅
Rum Shopify	N/A	202.37 KiB	N/A	N/A	N/A
Rum-shopify Profiler	N/A	8.43 KiB	N/A	N/A	N/A
Rum-shopify Recorder	N/A	3.72 KiB	N/A	N/A	N/A

[datadog-official]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 91.18%
• Overall Coverage: 77.12% (-0.01%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 88130a0 | Docs | View more details | Give us feedback!}