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The Mets’ bullpen carousel had stubbornly and admirably refused to start for a month, the club enjoying a run of stability with the same eight relief pitchers.

That time has ended, and the carousel is spinning into overdrive.

For one entire month — from Opening Day on March 27 until A.J. Minter hit the injured list on Sunday, April 27 — the Mets had rolled with the same eight relief pitchers (with the technical exception of a one-day option of Max Kranick and a one-game summons of Justin Hagenman, who served as a bulk pitcher after an opener).

“I was kind of like, ‘What?’” manager Carlos Mendoza said of the bullpen constancy. “I don’t know that I’ve seen this before.”

He knew that the group eventually would need reinforcements, but he did not know that injuries would strike nearly simultaneously.

Minter could be lost for the season with a lat strain that could require surgery (and brought him to the 60-day injured list Thursday). Their other lefty reliever, Danny Young, landed on the IL on Wednesday with an elbow sprain for which Tommy John surgery is on the table.

The scrambling Mets, who are amid a stretch of 26 games in 27 days, called up Jose Ureña Sunday and DFA’d the veteran by Tuesday. This week they already have called up and sent down Kevin Herget, Chris Devenski and Brandon Waddell.

The latter two were optioned ahead of Thursday’s series finale against the Diamondbacks at Citi Field, as the Mets brought up lefty Génesis Cabrera and righty Ty Adcock.

Cabrera, a six-year vet, at least has a possibility of working his way into the mix because he became the only lefty reliever on the team. He “has been throwing the ball well” and has five “weapons” to retire hitters, Triple-A Syracuse manager Dick Scott said this week, Cabrera struggling for results (7.88 ERA in seven games) but missing plenty of bats (12 strikeouts in eight innings).

Eventually, the Mets expect the recently signed and recovering lefty Brooks Raley to become an option. More immediately, Mendoza believes righty Dedniel Núñez will be recalled for his season debut “shortly.”

Last year’s revelation has been built up carefully, first in spring training and now with Syracuse, after his forearm concern that cut short his 2024 season. His stuff has been intact with Syracuse, and the Mets do not want Núñez to be one of the interchangeable arms they have been calling up and sending down this week.

“We want to make sure when he does come up, we want to keep him for a long time,” Mendoza said.

Another possible option further down the road: Waddell, who impressed as Wednesday’s bulk pitcher with 4 ⅓ scoreless innings and will continue to be stretched out as a starter at the lower level.

“But I could see a scenario where we might need him to be another lefty out of the bullpen,” Mendoza said.