Looks like these messages are printed by new resource management code.

To reproduce:
Go to rt-closed/toys/CanvasTest
$ java -cp "../../../artifacts/sdk/rt/lib/ext/jfxrt.jar;dist/CanvasTest.jar" zoomy.Zoomy

D3D Vram Pool: 72,723,200 used (27.1%), 72,723,200 managed (27.1%), 268,435,456
total
18 total resources being managed
1 permanent resources (5.6%)
4 resources locked (22.2%)
1 resources contain interesting data (5.6%)
10 resources disappeared (55.6%)

D3D Vram Pool: 77,638,400 used (28.9%), 77,638,400 managed (28.9%), 268,435,456
total
19 total resources being managed
1 permanent resources (5.3%)
3 resources locked (15.8%)
1 resources contain interesting data (5.3%)
12 resources disappeared (63.2%)

D3D Vram Pool: 82,553,600 used (30.8%), 82,553,600 managed (30.8%), 268,435,456
total
20 total resources being managed
1 permanent resources (5.0%)
4 resources locked (20.0%)
1 resources contain interesting data (5.0%)
12 resources disappeared (60.0%)

D3D Vram Pool: 87,468,800 used (32.6%), 87,468,800 managed (32.6%), 268,435,456
total
21 total resources being managed
1 permanent resources (4.8%)
5 resources locked (23.8%)
1 resources contain interesting data (4.8%)
12 resources disappeared (57.1%)