At the moment we are using the Stamen Toner Labels tile server to display additional information over various World Imageries.
The problem is, `Stamen.TonerLabels` is now closing:
https://maps.stamen.com/stadia-partnership/
== Possible alternatives ==
Find one here:
https://leaflet-extras.github.io/leaflet-providers/preview/
Example:
https://leaflet-extras.github.io/leaflet-providers/preview/#filter=CartoDB.PositronOnlyLabels
```
var CartoDB_PositronOnlyLabels = L.tileLayer('https://{s}.basemaps.cartocdn.com/light_only_labels/{z}/{x}/{y}{r}.png', {
attribution: '© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors © <a href="https://carto.com/attributions">CARTO</a>',
subdomains: 'abcd',
maxZoom: 20
});
```
The problem is: this version is not included in our version of `leaflet-providers.js` so we also must update it, in case.