Understanding Common Sentry Issues

Users of Sentry frequently face the following challenges:

• Errors not appearing in Sentry or missing logs.
• High event volume and rate limits.
• Source maps not applying correctly.
• Integration failures with third-party services.

Root Causes and Diagnosis

Errors Not Appearing in Sentry or Missing Logs

Issues with missing logs can be caused by misconfigured SDKs, incorrect DSN settings, or network issues. Verify that Sentry is correctly initialized:

import * as Sentry from "@sentry/browser";

Sentry.init({
    dsn: "https://This email address is being protected from spambots. You need JavaScript enabled to view it./project-id",
    tracesSampleRate: 1.0
});

Manually capture an exception to test error reporting:

try {
    throw new Error("Test error");
} catch (e) {
    Sentry.captureException(e);
}

Ensure network requests to Sentry are successful:

curl -v https://This email address is being protected from spambots. You need JavaScript enabled to view it./api/

High Event Volume and Rate Limits

Sending too many events may trigger rate limiting, causing some errors to be dropped. Check the event quota in Sentry:

Sentry Dashboard > Project Settings > Usage & Quotas

Reduce event volume by sampling traces:

Sentry.init({
    dsn: "https://This email address is being protected from spambots. You need JavaScript enabled to view it./project-id",
    tracesSampleRate: 0.2
});

Filter unnecessary events to prevent overloading:

Sentry.init({
    beforeSend(event) {
        if (event.message && event.message.includes("IgnoreError")) {
            return null;
        }
        return event;
    }
});

Source Maps Not Applying Correctly

Source maps allow Sentry to display readable stack traces instead of minified code. Ensure source maps are uploaded correctly:

sentry-cli releases new -p my-project 1.0.0
sentry-cli releases files 1.0.0 upload-sourcemaps ./dist --url-prefix "/static/js"

Verify source maps exist in the Sentry UI:

Sentry Dashboard > Project > Source Maps

Ensure correct sourceMappingURL is present in the minified files:

//# sourceMappingURL=/static/js/main.js.map

Integration Failures with Third-Party Services

Sentry supports integration with many third-party services like GitHub, Slack, and Jira. If integrations fail, verify webhooks and permissions:

Sentry Dashboard > Settings > Integrations

Manually test webhook connectivity:

curl -X POST -H "Content-Type: application/json" \
     -d '{"event":"test"}' \
     https://hooks.slack.com/services/YOUR_WEBHOOK

Ensure API keys are valid and have required permissions:

Sentry Dashboard > API Keys

Fixing and Optimizing Sentry Configurations

Ensuring Error Logs Appear in Sentry

Verify SDK initialization, manually trigger test errors, and check network requests.

Managing Event Volume and Rate Limits

Monitor event quotas, enable trace sampling, and filter non-critical errors.

Fixing Source Map Issues

Ensure source maps are uploaded, verify the sourceMappingURL, and check the Sentry UI for available source maps.

Resolving Integration Failures

Verify webhook connectivity, test API key permissions, and check third-party integration settings.

Conclusion

Sentry provides powerful error tracking and monitoring, but missing logs, high event volumes, source map issues, and integration failures can affect its effectiveness. By systematically troubleshooting these problems and optimizing configurations, developers can enhance application stability and observability.

FAQs

1. Why are my errors not appearing in Sentry?

Ensure SDK initialization, manually trigger an error, and check network requests to Sentry.

2. How do I reduce the number of events sent to Sentry?

Enable trace sampling, filter unnecessary events, and monitor event quotas in the Sentry dashboard.

3. Why is my source map not working in Sentry?

Ensure source maps are uploaded correctly, check for sourceMappingURL in minified files, and verify source map availability in Sentry.

4. How do I fix failed integrations with Slack or GitHub?

Verify API keys, check webhook connectivity, and ensure correct permissions in Sentry integration settings.

5. Can Sentry monitor performance metrics?

Yes, Sentry supports performance monitoring by enabling transaction tracing in the SDK.