Very pretty my guess is some type of Sedum, but iding hardy Sedums is not my department;).

Sempervivums - hens and chicks blooming.

Those flowers aren’t coming from Sempervivums. It does look like Sedum reflexum ‘Blue Spruce’. Very close.

Green ground cover with yellow flowers could be Sedum rupestre/Petrosedum rupestre 'Blue Spruce'. Blom stalks of Sempervivums are quite similar, but thicker and blooms more colorful.

I’ve never seen yellow-coloured Semp flowers. Sedum flowers, OTOH, are overwhelmingly yellow.

I agree about sedum, but the tops of the stems are different from S. rupestre, with more leaves coming together almost like a flower. Probably a form of Sedum forsterianum.

I have one called 'Antique Grill' that looks just like that. Stems and lower foliage look really cool in winter... reddish-orange coloring, contrasted with the blue-green tips.

Sedum forsterianum ssp. elegans ‘Silver Stone’ seems like a match.

I remembered I have what I think is the same plant? This was only planted last summer.