What is the meaning of the hadith, “The sky groaned, and it is right for it to groan”?

But is the point of the hadith not related to the angels?
Yes, but even though the heavens are the most perfect and strongest of things, there is no impediment to their groaning or to the Throne groaning; for it is Allah (Exalted and Majestic is He) who holds them , and their groaning does not prevent them from being held, great, and strong. Allah (Exalted and Majestic is He) holds them, and this does not indicate that it is impossible. So, it groaned just as it is strong and held. Thus, the Throne, just as it is held and strong, may groan out of the magnification of Allah, out of the fear of Allah, because of His majesty, not because it needs it, but rather it groans out of its fear and its magnification of Allah. The Throne, out of its magnification of Allah, out of its shyness, there is no doubt in that. A person may feel awkward, may tremble, not because of a weight upon him, but out of magnification and shyness, or for another reason from the illnesses that occur. So, the Throne is a created thing among the creations that may groan for many reasons, not for weight, and not for need. If the chain of narration is sound, there is no need for figurative interpretation.
Q: What is the meaning of groaning?
A: Groaning is the shaking and movement due to the weight of what is upon it, or from a tremor, or from fear, or from something similar. It is close to the meaning of creaking, when a person carries something heavy, such as a heavy load or a burden, it may have movement and sound from the weight of what is upon it.
And the weak ceiling is likewise, if heavy things are placed upon it.