There is a cache management utility now. Have you looked at it? Is there any functionality missing there?
I was not aware of the sssd-tools package (not installed by default) - thanks, that solves my requirement.

Yes I agree having a way to dump current status of the SSSD responders and providers would be a nice to have. But it is not quite simple.
I think we have a ticket for this.
See some thoughts that Stephen recorded there:
I have just updated this ticket with my thoughts

I see.
Can you please add a comment to the ticket explaining why the preferred server support is not sufficient and the support of sites is required. 
I have updated the ticket 1032 too.

I really appreciate you lads try to be helpful. Many thanks!