Currently, my site gets issues with inconsistent Examine index between master and slave sites. When I looked into the database in the umbracoServer table, there was no entries. Though bellow code defintely ran

public class LoadBalancingConfig : ApplicationEventHandler
{
    private static readonly ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

    protected override void ApplicationStarting(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
        ServerMessengerResolver.Current.SetServerMessenger(
            new BatchedDatabaseServerMessenger(
                applicationContext,
                true,
                new DatabaseServerMessengerOptions()
                {
                    DaysToRetainInstructions = 2, // 2 days
                    ThrottleSeconds = 5, // 5 second
                    MaxProcessingInstructionCount = 1000,
                    PruneThrottleSeconds = 60 // 1 minute
                }
            )
        );

        var isMasterServer = ConfigurationManager.AppSettings[ArcticConstants.AppSettinKeys.Environment] == ArcticConstants.Environments.Backoffice;

        IServerRegistrar2 serverRegistrar = isMasterServer ? new MasterServerRegistrar() as IServerRegistrar2 : new FrontEndReadOnlyServerRegistrar();

        ServerRegistrarResolver.Current.SetServerRegistrar(serverRegistrar);

        Log.Warn($"Enabling flexible loadbalancing. Server role set to: {serverRegistrar.GetCurrentServerRole().ToString("G")}");
    }
}

These are things I would like to know: What could I be missing within configuration?
Which table holds queues to update slave sites? Any ideas how to force slave site to update Examine index based on master?