Is it only me or has something changed and the LINZ imagery (both aerial and topo) is not showing anymore? 
Can confirm: No images in ID but works for me in JOSM:
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2019-04-08 08:29:03.178 INFORMATION: GET https://tiles-a.data-cdn.linz.govt.nz/services;key=56742d94dd12449bb5d9ea994389
aa6f/tiles/v4/set=2/EPSG:3857/15/32394/20075.png -> 200 (53,0 kB)
2019-04-08 08:29:03.303 INFORMATION: GET https://tiles-a.data-cdn.linz.govt.nz/services;key=56742d94dd12449bb5d9ea994389
aa6f/tiles/v4/set=2/EPSG:3857/10/1012/627.png -> 200 (45,9 kB)
2019-04-08 08:29:03.834 INFORMATION: GET https://tiles-a.data-cdn.linz.govt.nz/services;key=56742d94dd12449bb5d9ea994389
aa6f/tiles/v4/set=2/EPSG:3857/15/32398/20075.png -> 200 (46,5 kB)
2019-04-08 08:29:03.865 INFORMATION: GET https://tiles-a.data-cdn.linz.govt.nz/services;key=56742d94dd12449bb5d9ea994389
aa6f/tiles/v4/set=2/EPSG:3857/15/32399/20076.png -> 200 (44,2 kB)
2019-04-08 08:29:03.990 INFORMATION: GET https://tiles-a.data-cdn.linz.govt.nz/services;key=56742d94dd12449bb5d9ea994389
aa6f/tiles/v4/set=2/EPSG:3857/15/32393/20075.png -> 200 (54,1 kB)
2019-04-08 08:29:04.052 INFORMATION: GET https://tiles-a.data-cdn.linz.govt.nz/services;key=56742d94dd12449bb5d9ea994389
aa6f/tiles/v4/set=2/EPSG:3857/14/16198/10037.png -> 200 (50,5 kB)
2019-04-08 08:29:04.599 INFORMATION: GET https://tiles-a.data-cdn.linz.govt.nz/services;key=56742d94dd12449bb5d9ea994389
aa6f/tiles/v4/set=2/EPSG:3857/15/32399/20075.png -> 200 (31,4 kB)
2019-04-08 08:29:04.801 INFORMATION: GET https://tiles-a.data-cdn.linz.govt.nz/services;key=56742d94dd12449bb5d9ea994389
aa6f/tiles/v4/set=2/EPSG:3857/14/16196/10037.png -> 200 (55,8 kB)
...
Where would be the best place to go to report that? Or what to do about it?
Just an update regarding to this:
This is the right github for it and there is already an ongoing issue discussion about it. https://github.com/osmlab/editor-layer-index/issues/602
And to be able to still use LINZ layers, you just need to register with LDS and put your own API key in the custom layer.
http://tiles-a.data-cdn.linz.govt.nz/services;key=YOUR_API_KEY/tiles/v4/set=4702/EPSG:3857/{z}/{x}/{y}.png
But to be fair the ESRI clarity uses the same imagery it’s just not as sharp. So that’s as good as replacemnt for this layer.
To get the Topo layer:
http://tiles-a.data-cdn.linz.govt.nz/services;key=YOUR_API_KEY/tiles/v4/layer=2343/EPSG:3857/{zoom}/{x}/{y}.png