/// <summary>
/// Ends timing of a failed block, calculates elapsed time
/// and records the associated trace.
/// </summary>
/// <param name="error">an error object associated with this trace.</param>
public void EndFailure(Exception error)
{
if (_tracer != null)
{
long elapsed = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds() - _start;
_tracer.Failure(_correlationId, _component, _operation, error, elapsed);
}
}