Peterbilt 579 2025 metal noise and white smoke

So I have a Peterbilt 579 2025, and sometimes there's this metal sounds that's coming under the hood. Usually it does it slightly when I press the pedal, let go of it and let the truck coast on its own, basically when driving slow at a truck stop and stuff. But I haven't heard it until today, and I've been noticing this white smoke with a weird sweet smell to it coming out of the drive axle of the truck. I do idle the truck all night so I don't know if that's one of the reasons that's causing it. It happens when the truck idle at 800rpm, so I push in the truck break and leave the trailer break out so the truck doesn't shutdown on me and my battery doesn't die. When I woke up in the morning, I release the truck break and it went idling at 600rpm to 800rpm and that's when the white smoke start showing, it does for about 30-45 seconds. Peterbilt do have that auto start button that start your truck when the battery is about to die, but it honk before doing that, and I didn't want to wake up drivers in the middle of the night, in deep sleep with it, and if it does it multiple times, people would start looking at me funny lol. So I wanted to hear you guys opinion on it, am I doing it wrong by idling all night and am I screwed with this truck or am I overreacting. I've attached a video for reference. Thanks!

https://youtube.com/shorts/BVHS2Kh9qz4?si=pcZzc4hHEhGc78wd

 

Cool, I'll look and see, it does it when it's idling at 800rpm though and there's no warning light, I just talk to the shop and they told me, it's because I've been idling for a long time that's what causing that sound and the smoke they said it's just the truck doing a light regen and it's burning off the particles and stuff, so yeah. As long as I let them know then I'm cool, in case it's something serious, they won't blame me then.

Yeah, I'm dumb as hell, I should've done that lol.

 

Lol! You're funny as hell!

Yup, I'll do that next time.