Is Qatar Airways' hand baggage size strictly enforced?

Is Qatar Airways' hand baggage size strictly enforced? - From above of crop anonymous oculist in sterile gloves measuring modern eyewear with optical tool on white background

Qatar Airways states on their homepage:

Maximum dimensions for each piece of hand baggage are 50x37x25cm (20x15x10in)

The height of my hand baggage measures 55 cm; sort of 50 cm large body + gears. Does ground personnel strictly enforce the 50 cm?

If yes, how much fee do I need to pay (couldn't find this on their website)?






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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Ksenia Chernaya, Blue Bird, Anete Lusina, Maksim Goncharenok