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agentic-dev/docs/library-decisions/2026-05-14-@sentry/nextjs.md
Danijel Martinek f77e6ea881 chore(template): clean-slate template snapshot from bb4a0c7
Curated, product-agnostic snapshot of the post-story-04 tree: demo
content deleted, auth-only reference feature, web-next shell, all gates
green. Product-specific docs, ADRs 027-029, PRDs/epics/archive, editor
library traces, and product naming are curated out; generic template
repairs (coverage provider devDeps, root test:coverage script, live
lint fixes, root-only release-please) are kept. See TEMPLATE.md for
provenance, curation list, and usage.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK
2026-07-12 20:40:54 +02:00

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---
package: "@sentry/nextjs"
version: "^10.51.0"
tier: core
decision: approved
date: 2026-05-14
deciders: [Danijel Martinek]
adr: adr-014
filter-results:
license: MIT
types: native
maintenance: active
boundary-fit: pass
shadow-check: pass
eu-residency: ok
cve-scan: clean
named-consumer: pass
socketRisk: clean
verification-commands:
- npm view @sentry/nextjs license
- npm view @sentry/nextjs version
- pnpm audit --audit-level=moderate
accepted-cves: []
---
## Filter: license
<!-- Result: MIT -->
`npm view @sentry/nextjs license` returns `MIT`. MIT is on the allowlist.
## Filter: types
<!-- Result: native -->
`@sentry/nextjs` is authored in TypeScript and ships its own `.d.ts` declaration files. No separate `@types/` package is needed.
## Filter: maintenance
<!-- Result: active -->
Actively maintained by Sentry Inc. The 10.x line sees regular releases tracking Next.js releases. Used by thousands of production Next.js apps; issue tracker shows prompt engagement.
## Filter: boundary-fit
<!-- Result: pass -->
ADR-014 designates Sentry as the error-capture and tracing backend. The ESLint `no-restricted-imports` rule (ADR-014 §6) allowlists `@sentry/*` only within `core-shared/instrumentation/sentry/**`, the apps' `instrumentation*.{ts,mjs}` / `next.config.{mjs}` entry points, and the `core-testing/setup/no-sentry.ts` mock. Feature packages MUST NOT import `@sentry/*` directly — they consume only the vendor-neutral `ITracer`/`ILogger` interfaces.
## Filter: shadow-check
<!-- Result: pass -->
`@sentry/nextjs` is the sole Next.js error-monitoring SDK in the workspace. No competing APM or crash-reporter library (Datadog, New Relic, Rollbar, Bugsnag) is present or proposed.
## Filter: eu-residency
<!-- Result: ok -->
Sentry offers EU-region data residency (hosted at `de.sentry.io`). The workspace's `WEB_NEXT_SENTRY_DSN` can point to an EU-hosted project; the SDK routes all payloads to the DSN host. PII scrubbing at the OTel processor layer (ADR-017, ADR-014 §4) ensures only scrubbed data leaves the process.
## Filter: cve-scan
<!-- Result: clean -->
`pnpm audit --audit-level=moderate` reports no advisories against `@sentry/nextjs` at the time of this trace.
## Filter: named-consumer
<!-- Result: pass -->
`packages/core-shared/src/instrumentation/sentry/` holds the Sentry adapter pair (`SentryTracer`, `SentryLogger`). `apps/web-next/instrumentation.ts` and `apps/web-next/next.config.mjs` are the concrete Next.js-side consumers. Both are named, non-hypothetical consumers.
## Prompt: replaces
No prior error monitoring or distributed tracing library was in place. `@sentry/nextjs` replaces ad-hoc `console.error` logging that provided no stack context, no distributed trace correlation, and no session replay for diagnosing reproduction steps.
## Prompt: migration-cost-out
Moderate. The interface boundary (ADR-014 §1) limits feature-package blast radius to zero — feature code never imports `@sentry/nextjs`. Removal would require swapping the `SentryTracer`/`SentryLogger` adapter pair in `core-shared/instrumentation/sentry/` for a new adapter, updating `apps/web-next/instrumentation.ts` and `next.config.mjs`, and dropping the `WEB_NEXT_SENTRY_DSN` env var. The scope is bounded and mechanical.
## Prompt: alternatives-considered
1. **Datadog APM** — Stronger distributed tracing primitives, but higher cost, heavier SDK footprint, and no built-in session replay. Evaluated and deferred.
2. **New Relic** — Enterprise-grade but requires a New Relic account and agent; no native Next.js SDK at the time of evaluation.
3. **Direct OpenTelemetry export** — Deferred to ADR-017 for the OTel migration layer; Sentry remains the exporter via `@sentry/opentelemetry` bridge.
See ADR-014 for the full decision rationale.