There is no tracker in this sense. I thought so too when I read the patch notes. What they meant was:

Before the patch you could go to an area and hit, for example: a tree, a harvest, and then a mine, and then you could go back to the tree and log again. Now, the game tracks these nodes per DoL, not just overall. So now, if you want to chop that first tree again, you have to log/harvest 3 different nodes. In the example I gave, it would not reset any of the 3 nodes harvested, a third botanist node would need to be found before chopping that first tree again, and 2 more mining/quarry nodes would need to be found to mine that first rock again.

I found this out the hard way when I tried to level botanist and miner at the same time at camp tranquil. I hope this clears things up. Go try it if you want to verify it yourself