The spoke tension is fine all around and the wheel holds true but it looks like cracking rims is considered “normal” after 4 years (only the last 2 were dedicated commuting at around 240km/wk on paved surface. It’s a Bontrager TLR rim but no model given - so I’m assuming low-end stock wheels with Trek Checkpoint ALR 5 bikes. I still say it’s a design flaw since all 6 spoke hole cracks are on the drive side of the rear wheel.