Settings and env surface for OTEL export (CL-5175) - #306
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Resolves CL-5175: otel-config.ts parses and validates endpoint, headers, service name, and resource attributes from settings + env; fails closed on invalid config with a stable OTEL_CONFIG_INVALID error. otelConfigForDump exposes header names only so secrets never reach privacy-strict dumps. Docs cover Phoenix, PostHog OTEL, and generic collectors. The actual OTLP transport is a follow-up (CL-5173).
Resolve serviceName as env > settings > attrs["service.name"] > default, then always write resourceAttributes["service.name"] so the two never diverge. Redact high-risk resource attr values in otelConfigForDump. Document Phoenix cloud as a base OTLP URL (exporter appends /v1/traces).
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Stack
PerfTrace stack 3a/8 — base:
stack/w2a-cl-5171-auto-spansLinear
https://linear.app/abklabs/issue/CL-5175/settings-and-env-surface-for-otel-export
Summary
Opt-in OTEL settings/env surface (endpoint, headers, enabled flag). Disabled by default — zero network when off.
Test evidence
Merge note
Merge after CL-5171 auto-spans PR.