I am not sure how my rim got bent or when. It has no vibration or anything, but I happen to notice it when cleaning it today. Does this need to get repaired or replaced? I'm guessing maybe I hit a pothole, or happened when I curbed it previously?

 

Yes, it can be repaired.
Need to? If it’s holding air(*), I’d say no, but it’s up to you. Do you get any noise (wup-wup-wup) from it? If yes, I’d get it repaired, just because it would be annoying.

* - I’d experiment with various tire pressures for a few days to make sure that’s the case (try -5 and +10, to account for temperature fluctuations)

 

No noise from it. I plan on keeping an eye on the air.

 

I'd say if no air loss or vibration, just leave it be.
No matter how you try to fix that the rim will likely need to be refinished...so maybe next time it needs tires if you want to fix it.