The Attorney General, William Barr, took it from there. He wrote in his summary that in consultation with his deputy, Rod Rosenstein, he determined that the evidence presented by the special counsel was "not sufficient to establish that the President committed an obstruction-of-justice offense."
In other words, Mueller deemed the obstruction issue too murky and thus deferred to his bosses, Barr and Rostenstein.
They in turn oversaw the special counsel, and the two of them didn't see any reason for prosecution.
That is, in no uncertain terms, an exoneration, no matter what CNN's cute graphic wants you to think.