sentry-upgrade-migrationClaude Skill

Sentry Upgrade Migration

Detect installed Sentry SDK versions, identify breaking API changes, apply automated codemods, and verify the upgrade succeeds with test events and traces.

Current State

!npm list 2>/dev/null | command grep @sentry || echo 'No npm Sentry packages found' !pip show sentry-sdk 2>/dev/null | command grep -E '^(Name|Version)' || echo 'No Python sentry-sdk found' !node --version 2>/dev/null || echo 'Node.js not available'

Overview

Sentry SDK upgrades require careful handling of breaking API changes. The v7 to v8 JavaScript migration is the most impactful, removing the Hub pattern, replacing Transaction/Span APIs with startSpan(), converting class-based integrations to functions, and requiring ESM-first initialization. Python SDK v1 to v2 similarly replaces configure_scope() with get_current_scope(). This skill automates version detection, runs the official @sentry/migr8 codemod, applies manual fixes for patterns the codemod misses, and validates the upgrade with test events.

Prerequisites

• Current Sentry SDK version identified (run DCI above)
• Target version changelog reviewed
• Non-production environment for testing upgrades
• All @sentry/* packages at the same major version before starting
• Node.js >= 18.19.0 or >= 20.6.0 for SDK v8 (ESM support required)

Instructions

Step 1. Identify Current SDK Version and Scan for Deprecated APIs

# JavaScript: list all Sentry packages and their versions
npm ls 2>/dev/null | command grep "@sentry/"

# Python: check installed version
pip show sentry-sdk 2>/dev/null

# Verify all @sentry/* packages are the same major version (critical!)
# Mixed versions cause runtime crashes
npm ls @sentry/core @sentry/node @sentry/browser @sentry/utils 2>/dev/null

Scan the codebase for deprecated patterns that need migration:

# Detect v7 Hub usage (removed in v8)
command grep -rn "getCurrentHub\|configureScope\|hub\.capture" src/ --include="*.ts" --include="*.js"

# Detect v7 Transaction API (replaced in v8)
command grep -rn "startTransaction\|\.startChild\|\.finish()" src/ --include="*.ts" --include="*.js"

# Detect class-based integrations (replaced in v8)
command grep -rn "new Sentry\.\|new BrowserTracing\|new Integrations\." src/ --include="*.ts" --include="*.js"

# Detect @sentry/tracing imports (package removed in v8)
command grep -rn "from '@sentry/tracing'" src/ --include="*.ts" --include="*.js"

# Python: detect v1 scope API (replaced in v2)
command grep -rn "configure_scope\|push_scope" src/ --include="*.py"

Step 2. Run the Automated Migration Codemod (JavaScript v7 to v8)

# First upgrade to latest v7 to get deprecation warnings
npm install @sentry/node@7

# Run the official migr8 codemod — rewrites deprecated APIs automatically
npx @sentry/migr8@latest
# Handles: Hub removal, integration class→function, import path changes
# Does NOT handle: Transaction→startSpan, ESM init pattern, custom transports

# Now upgrade to v8
npm install @sentry/node@8

Step 3. Apply Breaking Change Fixes the Codemod Misses

Breaking Change: Transaction/Span API replaced with startSpan()

// v7 (OLD) — manual transaction lifecycle
const transaction = Sentry.startTransaction({ name: 'process', op: 'task' });
const span = transaction.startChild({ op: 'db.query', description: 'SELECT users' });
// ... do work
span.finish();
transaction.finish();

// v8 (NEW) — callback-based, auto-finishes on return
await Sentry.startSpan({ name: 'process', op: 'task' }, async () => {
  await Sentry.startSpan({ name: 'SELECT users', op: 'db.query' }, async () => {
    // ... do work
  }); // span auto-finishes when callback returns
}); // root span auto-finishes when callback returns

Breaking Change: Hub removed, use Scope API

// v7 (OLD)
const hub = Sentry.getCurrentHub();
hub.configureScope((scope) => {
  scope.setTag('region', 'us-east-1');
});
const transaction = hub.startTransaction({ name: 'my-tx' });

// v8 (NEW)
Sentry.withScope((scope) => {
  scope.setTag('region', 'us-east-1');
});
Sentry.startSpan({ name: 'my-tx', op: 'custom' }, (span) => {
  // work within span
});

Breaking Change: Integrations are functions, not classes

// v7 (OLD)
import * as Sentry from '@sentry/node';
Sentry.init({
  integrations: [new Sentry.Integrations.Http({ tracing: true })],
});

// v8 (NEW) — most integrations are auto-enabled
Sentry.init({
  integrations: [
    Sentry.httpIntegration({ tracing: true }),
  ],
});

Breaking Change: @sentry/tracing removed

// v7 (OLD)
import { BrowserTracing } from '@sentry/tracing';
Sentry.init({
  integrations: [new BrowserTracing()],
});

// v8 (NEW) — built into @sentry/browser and @sentry/node
Sentry.init({
  integrations: [
    Sentry.browserTracingIntegration(),
  ],
});

Breaking Change: ESM initialization requires separate file

// v7 (OLD) — init at top of entry file
import * as Sentry from '@sentry/node';
Sentry.init({ dsn: '...' });
// ... app code

// v8 (NEW) — must be in separate file, loaded via --import
// instrument.mjs (separate file)
import * as Sentry from '@sentry/node';
Sentry.init({ dsn: '...' });

// Run with: node --import ./instrument.mjs app.mjs
// Or in package.json: "start": "node --import ./instrument.mjs app.mjs"

Breaking Change: Custom transport must return response

// v7 (OLD) — send could return void
makeRequest(request) {
  sendToBackend(request);
}

// v8 (NEW) — must return TransportMakeRequestResponse
makeRequest(request) {
  sendToBackend(request);
  return { statusCode: 200 };
}

See major-version-migrations.md for v6-to-v7 and Python v1-to-v2 migration details.

Step 4. Python SDK v1 to v2 Migration

# v1 (OLD) — configure_scope / push_scope
import sentry_sdk

with sentry_sdk.configure_scope() as scope:
    scope.set_tag("key", "value")

with sentry_sdk.push_scope() as scope:
    scope.set_extra("debug_info", data)
    sentry_sdk.capture_message("scoped message")

# v2 (NEW) — get_current_scope / new_scope
import sentry_sdk

scope = sentry_sdk.get_current_scope()
scope.set_tag("key", "value")

with sentry_sdk.new_scope() as scope:
    scope.set_extra("debug_info", data)
    sentry_sdk.capture_message("scoped message")

# Upgrade Python SDK
pip install --upgrade sentry-sdk

# Verify version
python -c "import sentry_sdk; print(sentry_sdk.VERSION)"

Step 5. Align All Package Versions and Update Bundler Plugins

# All @sentry/* packages MUST be the same major version
# Mixed versions cause "Cannot read properties of undefined" runtime errors
npm install @sentry/node@8 @sentry/browser@8 @sentry/react@8 @sentry/profiling-node@8

# Remove deprecated packages
npm uninstall @sentry/tracing @sentry/hub 2>/dev/null

# Update bundler plugins (must be v2.14.2+ for SDK v8 compatibility)
npm install @sentry/webpack-plugin@latest @sentry/vite-plugin@latest 2>/dev/null

Step 6. Verify the Upgrade with Test Events

// test-migration.mjs — run after upgrading
import * as Sentry from '@sentry/node';

async function verifyUpgrade() {
  console.log('SDK Version:', Sentry.SDK_VERSION);

  // 1. Test error capture
  try {
    throw new Error('Migration verification error');
  } catch (e) {
    const eventId = Sentry.captureException(e);
    console.log('Error captured:', eventId ? 'PASS' : 'FAIL');
  }

  // 2. Test scoped context (v8 API)
  Sentry.withScope((scope) => {
    scope.setTag('test', 'migration-verify');
    scope.setUser({ id: 'test-user' });
    Sentry.captureMessage('Scoped context test');
  });
  console.log('Scoped context: PASS');

  // 3. Test performance span (v8 API — replaces startTransaction)
  await Sentry.startSpan(
    { name: 'migration-verify', op: 'test' },
    async (span) => {
      await Sentry.startSpan(
        { name: 'child-operation', op: 'test.child' },
        async () => {
          await new Promise((r) => setTimeout(r, 50));
        }
      );
      console.log('Span created:', span ? 'PASS' : 'FAIL');
    }
  );

  // 4. Test breadcrumbs
  Sentry.addBreadcrumb({
    category: 'test',
    message: 'Migration breadcrumb',
    level: 'info',
  });
  console.log('Breadcrumb: PASS');

  // 5. Flush and verify delivery
  const flushed = await Sentry.flush(5000);
  console.log('Flush:', flushed ? 'PASS' : 'FAIL');
}

verifyUpgrade();

See testing-after-upgrade.md for the full verification checklist.

Step 7. Gradual Rollout Strategy

1. Upgrade in development environment, run full test suite
2. Watch for Sentry.startTransaction is not a function or similar runtime errors
3. Deploy to staging, monitor Sentry dashboard for 1-2 days
4. Check source maps still resolve (re-upload if bundler plugin changed)
5. Verify trace propagation between services (check sentry-trace header)
6. Deploy to production with rollback plan ready

Output

• SDK upgraded to target version with all @sentry/* packages aligned
• Deprecated APIs migrated: Hub removed, Transaction replaced with startSpan(), integrations converted to functions
• ESM initialization pattern applied (separate instrument.mjs file)
• @sentry/tracing package removed (functionality built into core packages)
• Bundler plugins updated to v2.14.2+
• Post-migration test events captured successfully in Sentry dashboard
• Source maps verified, traces propagating across services

Error Handling

Error	Cause	Solution
Cannot find module '@sentry/hub'	Package removed in v8	Replace hub imports with @sentry/node scope APIs
Sentry.startTransaction is not a function	API removed in v8	Use Sentry.startSpan() callback pattern instead
new Integrations.X is not a constructor	Classes removed in v8	Use functional form: Sentry.xIntegration()
Cannot find module '@sentry/tracing'	Package removed in v8	Remove import; tracing is built into @sentry/node v8
Mixed version runtime crash	Some @sentry/* at v7, others at v8	Align all packages: npm install @sentry/node@8 @sentry/browser@8
ERR_MODULE_NOT_FOUND on startup	ESM init file missing or wrong path	Create instrument.mjs, run with node --import ./instrument.mjs
Source maps not resolving	Bundler plugin version incompatible	Update @sentry/webpack-plugin or @sentry/vite-plugin to v2.14.2+
Python AttributeError: configure_scope	API removed in Python SDK v2	Use sentry_sdk.get_current_scope() instead
Transport.send must return object	Custom transport missing return	Return { statusCode: 200 } from makeRequest()
Node.js version error	SDK v8 requires Node 18.19+ or 20.6+	Upgrade Node.js: nvm install 20 && nvm use 20

See errors.md for additional error patterns.

Examples

Example 1: Full v7 to v8 JavaScript Migration

Request: "Upgrade our Express app from Sentry v7 to v8"

# Detect current state
npm ls 2>/dev/null | command grep "@sentry/"
# @sentry/node@7.114.0
# @sentry/tracing@7.114.0

# Run codemod
npx @sentry/migr8@latest

# Upgrade packages
npm install @sentry/node@8
npm uninstall @sentry/tracing

Before (v7 Express setup):

import * as Sentry from '@sentry/node';
import { Integrations } from '@sentry/tracing';

Sentry.init({
  dsn: process.env.SENTRY_DSN,
  integrations: [new Integrations.Express({ app })],
  tracesSampleRate: 0.2,
});

app.use(Sentry.Handlers.requestHandler());
app.use(Sentry.Handlers.tracingHandler());
// ... routes
app.use(Sentry.Handlers.errorHandler());

After (v8 Express setup):

// instrument.mjs — must be separate file
import * as Sentry from '@sentry/node';

Sentry.init({
  dsn: process.env.SENTRY_DSN,
  tracesSampleRate: 0.2,
});

// app.mjs — run with: node --import ./instrument.mjs app.mjs
import express from 'express';
import * as Sentry from '@sentry/node';

const app = express();

// v8: Sentry auto-instruments Express — no manual handlers needed
// Sentry.Handlers.requestHandler() and tracingHandler() are removed
// Error handler replaced with Sentry.setupExpressErrorHandler()
Sentry.setupExpressErrorHandler(app);

app.listen(3000);

Result: SDK upgraded to v8.49.0, @sentry/tracing removed, Express auto-instrumented, source maps verified, test error captured in dashboard.

Example 2: Python v1 to v2 Migration

Request: "Upgrade sentry-sdk from 1.x to 2.x in our Flask app"

# Before (v1)
import sentry_sdk
from sentry_sdk.integrations.flask import FlaskIntegration

sentry_sdk.init(
    dsn="...",
    integrations=[FlaskIntegration()],
)

with sentry_sdk.configure_scope() as scope:
    scope.set_tag("deploy", "v2.1")

# After (v2)
import sentry_sdk
from sentry_sdk.integrations.flask import FlaskIntegration

sentry_sdk.init(
    dsn="...",
    integrations=[FlaskIntegration()],
)

scope = sentry_sdk.get_current_scope()
scope.set_tag("deploy", "v2.1")

Result: SDK upgraded to 2.x, configure_scope replaced with get_current_scope, push_scope replaced with new_scope, Flask integration unchanged, test error captured.

Resources

• JavaScript v7 to v8 Migration Guide
• Node.js v7 to v8 Guide
• Express v7 to v8 Guide
• Python SDK v1 to v2 Migration
• @sentry/migr8 Codemod Tool
• Sentry SDK Changelog

Next Steps

• Run sentry-performance-tracing to configure v8 span-based tracing
• Run sentry-ci-integration to update CI source map upload after SDK change
• Run sentry-release-management to tag the upgraded release
• Run sentry-known-pitfalls to review common post-upgrade issues