To me, integrity is only about being true to yourself and what you believe to be the ultimate Truth / Good / whatever. I don't believe for a moment someone has to be totally open about that process and all the nuances of that perspective to all those around them, since part of my view of "ultimate good" includes (to the highest degree possible) doing no harm.
So, to me, integrity is a constant balancing act between pursuing great light and knowledge about ultimate Truth and not harming others in the process that shifts at the practical level as one's perspective shifts. Once the balancing act ceases, I believe integrity (at least for mortals) has died.
Don't get me wrong. I'm not advocating extreme situational ethics, where nothing is constant and immutable. I believe in immutable principles and absolute Truth; I just believe I have to be open to a continually evolving understanding of what they are.
I would love to hear how those who read this post view integrity.