Use velocity alerts to notify your team when any individual issue is causing an urgent problem in your app. For Crashlytics, an issue is a grouping of similar crashes.
What triggers an alert?
Velocity alerts are triggered when an issue in your app crosses a threshold that you define in the Firebase console.
You define the threshold for velocity alerts in terms of a percentage of user sessions that were impacted by a crash. Refer to Google Analytics for Firebase documentation to learn more about sessions. You can set a threshold value between 0.1% and 1% of sessions. By default, the velocity alert threshold is set at 1% of sessions.
Specifically, an alert is triggered if, during a one-hour time period, the following are true:
- An issue in an app exceeds the defined threshold for that app.
- The app has 250 sessions in that time period.
- There was no alert previously raised for the issue in the app.
Update the alert threshold
Set a velocity alert threshold for each of your registered apps. Each app can have a different alert threshold.
- In the Firebase console, go to your Crashlytics dashboard.
- At the top of the page, select an app from the app dropdown list.
- In the top bar of the Issues pane, open the overflow menu ( ), then select Velocity alert settings.
- Follow the on-screen instructions to set the alert threshold for the app.
You can route velocity alerts to your team using either: