Hi,
We are getting a lot of blocked sessions on the graphs. However, when I drill into it there are no details about it.
Do you mind posting some screenshots so we can see what you are referring to?
We had a support case for this some time ago for SQL server. I drafted the following KB explaining what we found and entered an Item for it in for a review. The default metric for blocked sessions is not filtering some items that the DPA quick poll and blockers tab are filtering. Does this KB look like what you are seeing?
Blocked DPA SQL server sessions - SolarWinds Worldwide, LLC. Help and Support