Performance Monitoring troubleshooting and FAQ

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 10 minutes of starting your app, the Performance dashboard of the Firebase console displays an "SDK detected" message.

If it's been more than 10 minutes since you added the latest version of 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. 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 automatically collected traces but not for custom code traces? Try the following troubleshooting steps:

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

   • Names for custom code 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 code traces only (not all data).

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

What does "near real time" performance data mean?

Firebase Performance Monitoring is enhancing its data processing capabilities to reduce the processing latency for collected performance data. The performance data displayed in the Firebase console will soon reflect "near real time" data (meaning a few minutes delay for data display).

Previously, we processed collected performance data in batches, which resulted in a gap of a few hours between data collection and its display in the console. We're now processing the collected data as it comes in, which results in more immediate data display.

To take advantage of near real time data processing (when it fully launches), make sure your app uses a real time compatible SDK version.

How do I get near real time performance data for my app?

To take advantage of near real time data processing (when it fully launches), you only need to make sure that your app uses a Performance Monitoring SDK version that's compatible with real time data processing.

These are the real time compatible SDK versions:

• iOS — v7.3.0 or later
• Android — v19.0.10 or later (or Firebase Android BoM v26.1.0 or later)
• Web — v7.14.0 or later

Note that we always recommend using the latest version of SDK, but any version listed above will enable Performance Monitoring to process your data in near real time.

Which versions of the Performance Monitoring SDK are considered real time compatible?

These are the SDK versions compatible with real time data processing:

• iOS — v7.3.0 or later
• Android — v19.0.10 or later (or Firebase Android BoM v26.1.0 or later)
• Web — v7.14.0 or later

Note that we always recommend using the latest version of SDK, but any version listed above will enable Performance Monitoring to process your data in near real time.

What if I don't update my app to use a real time compatible SDK version?

If your app doesn't use a real time compatible SDK version, you will still see all your app's performance data in the Firebase console. However, after real time data processing fully launches, the display of performance data will be delayed by roughly 36 hours from the time of its collection.

I've updated to a real time compatible SDK version, but some of my users are still on old versions of my app. Do I continue to see their performance data in the Firebase console?

Yes! Regardless of which SDK version an app instance uses, you'll see performance data from all your users.

Note that after real time data processing fully launches, there will be some differences. After the full launch, if you look at recent data (less than roughly 36 hours old), then the displayed data is from users of app instances using a real time compatible SDK version. The non-recent data, though, includes performance data from all versions of your app.