Not common, but not rare either. There was another one about 6 weeks ago.
There is also a 767 flying around with a history of spurious Tailskid MSG, which may lead some to think they have had a tail strike. (The message purely indicates position disagreement with the landing gear lever, not a tail strike - although if you squash the skid in a tail strike it may subsequently disagree)
Of course if the loud bang/scraping backs it up then......
The idea is to remain depressurised and return to land in case the fuselage is compromised.