Meet the Mess. Three days after the Mets’ 2017 season dissolved in an embarrassing mess of anonymous allegations against manager Terry Collins, Sandy Alderson stepped forward to try to take responsibility for the disastrous ending.

“I am the leader of this group, I feel responsible for every aspect of its operation,” Alderson said. “In particularly in those areas where we may fall short.”

And the Mets have fallen short on and off the field once again.

In yet another ugly episode in Mets’ history, Collins’ seven years as the team’s manager will likely end after Sunday’s game, clouded by anonymous allegations that included he abused his bullpen, perhaps causing an injury to the team’s closer, let the “inmates run the asylum,” and needed the intervention of owner Fred Wilpon to keep his job this long.

Referring to the reports, Alderson was unhappy with the way 2017 came crashing down off the field.

“I thought it was an unfair piece given the time at which it was written and unfortunate given the fact that, we have said we will make a decision and have an announcement after the season,” the Mets GM said before Saturday night’s game at Citizens Bank Park. “I felt this was very unfortunate for the timing and for the content.

“To the extent that the information came from players, I was extraordinarily disappointed their willingness to talk without attribution. To the extent information purportedly came from anywhere in the front office, I was exceptionally disappointed. Were I to know who that person was, that person would be terminated immediately.”

Alderson did not deny the fact that Fred Wilpon, father of team COO Jeff Wilpon, had prevented him from making a manager change in the past, as alleged, and would not comment on Collins’ future.