The only consistent measures are likes and comments, and this video on the triggering of Article 50 filmed at work got 40 likes; nothing else I posted got more than 10.
This post, also work-related, celebrating us getting an award for our campaign to fund the eradication of polio, got 7 comments (all "congratulations"). I am also told that this got "8,471 views in the feed". I don't know what that means, and only posts from the last few weeks seem to have that metric displayed.
I wrote one new article for LinkedIn this year (as opposed to "posts" - a distinction whose difference is not clear), about the then imminent Northern Ireland Assembly election, and it got 111 "clicks"; also 11 likes and 3 comments. I have no other information on "clicks" so I can't judge how successful it was. 3 comments may not seem like much, but it's almost a tsunami by LinkedIn standards, and also one of them was from a former Taoiseach.
As I say, I like LinkedIn for may purposes, but it has some way to go to become an effective information sharing platform.