Very odd gaps between StartServiceLog and StartSessionLog

[munkii]

Gaps between StartSessionLog call and StartSessionLog call from 55mins to 11hours with nothing logged in between Description

Please describe the issue you are facing using the SDK.

Repro Steps

Please list the steps used to reproduce your issue.

1. We have a Xamarin Forms app that uses Microsoft.AppCenter.Analytics and Microsoft.AppCenter.Crashes version 5.0.3
2. We export those logs to Azure AppInSights

Details

1. Whilst investigating some odd behvior where our app was sending expired Azure B2C Access Tokens we were macthing the failed requests to AppCenter logs. Of the 8 occurences of this expired token issue i can match them to 6 failures in the AppCenter logs

2. They are all iOS users but that could be a coincidence

3. In the logs i see something like this each time

Timestamp	name
9/28/2024, 6:40:05.638 PM	StartSessionLog
9/28/2024, 6:37:29.081 PM	StartSessionLog
9/28/2024, 6:00:54.541 PM	DataSyncService - Sync All Finished
	LOTS OF LOG ROWS NOT INCLUDED Nothng unusual
9/28/2024, 6:00:30.862 PM	DataSyncService - Sync All Requested
9/28/2024, 6:00:30.850 PM	ThirdPartyService - Sync All Completed
9/28/2024, 6:00:27.821 PM	ThirdPartyService - Sync All Requested
9/28/2024, 6:00:26.601 PM	StartSessionLog
9/28/2024, 5:05:00.723 PM	ViewModel - HomeViewModel Appearing
9/28/2024, 5:05:00.349 PM	Connecting UserId To AppCenter
9/28/2024, 5:04:59.866 PM	StartServiceLog

Note the 55minute gap between one log 'ViewModel - HomeViewModel Appearing' and the 'StartSessionLog'. I have seen one occurence where the gao to StartSesssionLog was 11hours

[IlyaBausovAkvelon]

Hi @munkii, thank you for reporting! Could you please tell us how AppCenter.Analytics is being started in the app? Where is called Appcenter.Start? Is App being put into background right after launch? I am asking because Analytics is trying to send start session event while initializing and after app is being put back to foreground.

[munkii]

We call it in Xamarin.Forms.Application OnStart

protected override void OnStart()
{
#if !RELEASE_LIVECONFIG
    AppCenter.Start(
        $"ios={AppSettings.AppCenterAnalyticsIosDevTest};" +
        $"android={AppSettings.AppCenterAnalyticsAndroidDevTest}",
        typeof(Analytics),
        typeof(Crashes));
#else
    AppCenter.Start(
        $"ios={AppSettings.AppCenterAnalyticsIos};" +
        $"android={AppSettings.AppCenterAnalyticsAndroid}",
        typeof(Analytics),
        typeof(Crashes));
#endif

    base.OnStart();

    Page pageToShow = null;

    if (Xamarin.Essentials.VersionTracking.IsFirstLaunchEver == false)
    {
        pageToShow = FreshPageModelResolver.ResolvePageModel<HomeViewModel>();
    }
    else
    {
        pageToShow = FreshPageModelResolver.ResolvePageModel<FirstRunViewModel>();
    }

    var mainNavContainer = new FreshNavigationContainer(pageToShow, NavigationContainerNames.MainContainer);
    this.MainPage = mainNavContainer;

    App.Current.On<Android>().UseWindowSoftInputModeAdjust(WindowSoftInputModeAdjust.Resize);
}

Is App being put into background right after launch? To be honest I don't know.

[IlyaBausovAkvelon]

Hi @munkii, Thank you for the information you've shared. These two events not necessary happen simultaneously. There could be a gap between start of service log and start of session log when the app has been put in background between them. Start service log potentially couldn't be sent in time because of that. Also do you use manual control of the session? Do you enable the following in your code: Analytics.EnableManualSessionTracker(); https://learn.microsoft.com/en-us/appcenter/sdk/analytics/xamarin#manage-start-session

[DmitriyKirakosyan]

Closing due to inactivity.