Support OTLP span and log export in browser environments

[Prithvirajkumar]

The otlpIntegration in @sentry/node-core/light forwards spans to Sentry's OTLP endpoint or a custom collector via OTLPTraceExporter + BatchSpanProcessor. No equivalent exists for browser environments, and log forwarding via OTLP is absent everywhere in the SDK.

Current behavior:

• otlpIntegration is Node-only (packages/node-core/src/light/integrations/otlpIntegration.ts); it supports both Sentry's OTLP endpoint and a custom collectorUrl
• Logs always use Sentry's envelope format (application/vnd.sentry.items.log+json) via createLogEnvelope — no OTLP log path exists in any environment

Gap:
Teams running their own OpenTelemetry collector pipeline can't route spans or logs from browser apps to it via Sentry SDKs. The Node light SDK proves the pattern is viable; the browser gap is primarily about bundle-size gating and ensuring the fetch-based OTLP transport works correctly.

Options:

1. Extend otlpIntegration to browser — OTLPTraceExporter supports fetch/XMLHttpRequest. The main work is tree-shaking the OTel exporter behind an explicit import path (similar to the existing @sentry/node-core/light/otlp entrypoint) to avoid bloating the default bundle.

2. Add OTLP log forwarding — Sentry's SerializedLog shape (severity_number, body, trace_id, OTel-style attributes) maps closely to an OTLP LogRecord. A log exporter option alongside enableLogs: true would let users forward structured logs to any OTLP collector endpoint.

These two options are independent and can be scoped separately.

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View Junior Session in Sentry

[linear-code]

JS-2985

[andreiborza]

We don't actually generate OTel spans on the browser, but even if, it's unlikely a use-case we'll support. The otlpIntegration will become available for browsers too in the next major v11, but it will be trimmed down to just connect Sentry events to OTel traces. The exporter will be removed entirely.

That being said, if people want to export the data they can always write their own custom transport that transforms the data into an OTLP format and send it off to where they want.