That’s before, shift pay, unsociable hours pay, the commission on what is sold on board, which used to be paid by all for one vouchers. Also they use to pay a food allowance which was tax free and that was paid once a month. You are looking at around €35-€40k a year. The more you fly ie Europes the more you earn.According to an article in the independent dated Aug 2021 "The pay scale for post 2012 will be increased to six points, with a new starting point of €24,617"
Now existing staff could be on higher salaries, have bonuses etc and I'm sure there's an upward pay scale but that seems to be the current starting rate.