feat(lambda): write cloud.account.id symlink from extension #2127
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Request the accountId feature from the Lambda Extensions API via the Lambda-Extension-Accept-Feature header. After Register() returns, write a symlink at /tmp/.otel-account-id whose target is the raw AWS account ID string. This allows Lambda SDK resource detectors to read the account ID without an additional API call. The symlink is removed before creation to handle Lambda execution environment reuse where /tmp persists. Failures are logged at debug level and silently skipped.
This was referenced Feb 9, 2026
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Summary
Register()call, the extension now creates a symlink at/tmp/.otel-account-idwith the AWS account ID as the targetaccountIdfeature via theLambda-Extension-Accept-Feature: accountIdheaderThis enables all OTel SDK Lambda resource detectors to read
cloud.account.idviareadlink()without needing IAM calls.Changes
collector/internal/extensionapi/client.go— ParseaccountIdfrom Register response, send Accept-Feature headercollector/internal/lifecycle/manager.go— Create symlink after registrationRelated PRs
SDK-side implementations that read this symlink (will be linked once created).
Test plan