/// <summary>
/// Returns a static tracking profile that only tracks instance terminated events.
/// </summary>
protected override TrackingProfile GetProfile(Guid workflowInstanceId)
{
    return GetProfile();
}
private volatile static TrackingProfile profile = null;
private bool sourceExists = false;
private TrackingProfile GetProfile()
{
    //
    // We shouldn't hit this point without the host ignoring an earlier exception.
    // However if we're here and the source doesn't exist we can't function.
    // Throwing an exception from here will block instance creation
    // but that is better than failing silently on termination 
    // and having the admin think everything is OK because the event log is clear.
    if (!sourceExists)
        throw new InvalidOperationException(string.Format(System.Globalization.CultureInfo.InvariantCulture, "EventLog Source with the name '{0}' does not exist", source));

    //
    // The profile for this instance will never change
    if (null == profile)
    {
        lock (typeof(TerminationTrackingService))
        {
            if (null == profile)
            {
                profile = new TrackingProfile();
                profile.Version = new Version("3.0.0.0");
                WorkflowTrackPoint point = new WorkflowTrackPoint();
                point.MatchingLocation = new WorkflowTrackingLocation();
                point.MatchingLocation.Events.Add(TrackingWorkflowEvent.Terminated);
                profile.WorkflowTrackPoints.Add(point);
            }
        }
    }
    return profile;
}