Performance Monitoring troubleshooting

How to view log messages for performance events

1. Open your browser's developer tools (for example, Network tab for Chrome Dev Tools or in the Network Monitor for Firefox).

2. Refresh your web app in the browser.

3. Check your log messages for any error messages.

4. After a few seconds, look for a network call to firebaselogging.googleapis.com in your browser's developer tools. The presence of that network call shows that the browser is sending performance data to Firebase.

If your app isn't logging performance events, review the troubleshooting tips.

Added the SDK to app, but console still says to add SDK

Firebase can detect if you've successfully added the Performance Monitoring SDK to your app when it receives event information (like app interactions) from your app. Usually within 2 hours of adding the SDK to your app, the Performance section of the Firebase console displays an "SDK detected" message.

If it's been more than 2 hours since you added the SDK to your app, and you're still not seeing this detection message, check your log messages to make sure that Performance Monitoring is logging events. Then, try the appropriate troubleshooting steps as described below to troubleshoot a delayed SDK detection message.

Console says the SDK is detected, but no data is displayed

Performance Monitoring processes performance event data before displaying it in the Performance dashboard.

If it's been more than 24 hours since the "SDK detected" message appeared, and you're still not seeing data, then check the Firebase Status Dashboard in case there is a known outage. If there is no outage, contact Firebase Support.

App is not logging performance events

If you're not seeing log messages for performance events, try the following troubleshooting steps:

1. Make sure that the Performance Monitoring SDK is correctly initialized in your app.

2. Make sure that the Performance Monitoring SDK is not disabled through the following flag:

   • performance.instrumentationEnabled

3. Make sure that your browser caching is disabled, otherwise the browser might not pick up any new instrumentation settings.

4. Close, then reopen the webpage tab. Check for logging again.

   If you just added the Performance Monitoring SDK in your app, you might need to fully restart your app for the SDK to start working.

5. If you can't find anything that's disabled in your app, contact Firebase Support.

Performance dashboard is missing first input delay data

If you're not seeing data for the first input delay metric, try the following troubleshooting steps:

1. Be aware that Performance Monitoring only records the first input delay metric when a user clicks on the web page within the first 5 seconds after page load.

2. Make sure that you've set up your app to measure this metric. The first input delay metric requires manual setup. Specifically, you need to add the polyfill library for this metric. For installation instructions, refer to the library's documentation.

   Note that adding this polyfill library is not required for Performance Monitoring to report other web app metrics.

Performance dashboard is missing custom trace data

Are you seeing performance data for automatic traces but not for custom traces? Try the following troubleshooting steps:

1. Check the setup of custom traces instrumented via the Trace API, especially the following:

   • Names for custom traces and custom metrics must meet the following requirements: no leading or trailing whitespace, no leading underscore (_) character, and max length is 32 characters.
   • All traces must be started and stopped. Any trace that is not started, not stopped, or stopped before started will not be logged.

   Note that if you're using the record() method, then you don't need to explicitly start or stop your trace.

2. Make sure that Performance Monitoring data collection is not disabled through the following flag:

   • performance.dataCollectionEnabled

     This flag controls the collection of data for custom traces only (not all data).

3. Check your log messages to make sure that Performance Monitoring is logging expected custom traces.

4. If Performance Monitoring is logging events, but no data displays after 24 hours, contact Firebase Support.

Performance dashboard is missing network request data

If you're missing network request data, be aware of the following:

• Performance Monitoring automatically collects metrics for network requests reported by the browser API. These reports do not include failed network requests.

• Depending on the behavior of your code and networking libraries used by your code, Performance Monitoring might only report on network requests that are completed. This means that HTTP/S connections that are left open might not be reported.

Network request data are not aggregating as expected

Learn more about how Performance Monitoring aggregates network request data under URL patterns.

You can also try out custom URL patterns!