✅ allow running e2e tests offline

[BenoitZugmeyer]

Motivation

Running E2E tests in an offline environment (e.g. on an airplane or without network access) would fail immediately — once because getIp() crashed when no network interface was found, and again because the intake server would reject connections when trying to forward requests to Datadog.

Changes

• Fall back to 127.0.0.1 in getIp() when no external IPv4 interface is available, instead of throwing
• Gracefully handle forwarding errors in the intake server by logging and resolving instead of rejecting

Test instructions

Run the E2E test suite while offline (or with the network interface disabled) and verify the tests start up correctly instead of crashing at initialization.

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	175.00 KiB	175.00 KiB	0 B	0.00%	✅
Rum Profiler	6.16 KiB	6.16 KiB	0 B	0.00%	✅
Rum Recorder	27.46 KiB	27.46 KiB	0 B	0.00%	✅
Logs	56.80 KiB	56.80 KiB	0 B	0.00%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	130.64 KiB	130.64 KiB	0 B	0.00%	✅
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	0.0046	0.0042	-8.70%
RUM - add action	0.0127	0.0137	+7.87%
RUM - add error	0.0135	0.0133	-1.48%
RUM - add timing	0.0025	0.0028	+12.00%
RUM - start view	0.0122	0.0155	+27.05%
RUM - start/stop session replay recording	0.0007	0.0008	+14.29%
Logs - log message	0.0144	0.0159	+10.42%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	27.37 KiB	25.81 KiB	-1.57 KiB
RUM - add action	53.07 KiB	49.94 KiB	-3.13 KiB
RUM - add timing	25.97 KiB	27.10 KiB	+1.13 KiB
RUM - add error	55.69 KiB	55.71 KiB	+20 B
RUM - start/stop session replay recording	25.52 KiB	26.19 KiB	+683 B
RUM - start view	462.52 KiB	469.77 KiB	+7.25 KiB
Logs - log message	44.79 KiB	43.55 KiB	-1.24 KiB

🔗 RealWorld

[datadog-official]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 77.21% (+0.00%)

_{This comment will be updated automatically if new data arrives.
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