Based on T144239 and https://meta.wikimedia.org/wiki/Schema:Kartographer,
The first phase puts:
* **1:100 (1%) of users in the test group**.
* 99% of users are not being tested.
Amongst this test group, the first phase triggers these events:
| | type | per-event sampling | description | optional `duration` | optional `extra` |
| --- | --- | --- | --- | --- | --- |
| x | `view` | 1:100 | user views this feature without explicit interaction to start | no | `route`(string) |
| x | `open` | 1:1 | user opens this feature | no | `route`(string) |
| x | `hashopen` | 1:1 | user was lead to a URL with map hash, resulting in a fullscreen map being displayed | no | `route`(string) |
| x | `close` | 1:1 | end of feature usage | **yes** | `route`(string) |
| x | `sidebar-show` | 1:1 | show sidebar in full screen | no | `route`(string) |
| x | `sidebar-hide` | 1:1 | hide sidebar in full screen | no | `route`(string) |
| x | `sidebar-click` | 1:1 | click on one of the ext service in the infobox | no | `route`(string), `service`(string), `type`(string) |
| x | `sidebar-type` | 1:1 | switch shown infobox types to a different one | no | `route`(string), `type`(string) |
List of events not triggered yet:
* [ ] `drag`: user dragged the map around
* [ ] `zoom`: user changed zoom
* [ ] `marker-click`: user clicked/tapped on a marker on map
* [ ] `shape-click`: user clicked/tapped on a geoshape overlay
* [ ] `map-click`: user clicked/tapped on map
* [ ] `discovery`: user goes to another page thanks to this feature
* [ ] `activate`: for mapframe's static snapshot, user clicked to interact with the map
* [ ] `wv-warn` - external data viewing warning is shown
* [ ] `wv-warn-agree` - external data viewing was accepted
* [ ] `wv-warn-reject` - external data viewing was rejected
* [ ] `wv-select-wmflayer` - switched to wmflayer
* [ ] `wv-select-exlayer` - switched to non-wmf layer (after warning)
* [ ] `wv-show-layer` - a wmf layer was enabled
* [ ] `wv-hide-layer` - a wmf layer was hidden
* [ ] `wv-show-exlayer` - an external layer was enabled
* [ ] `wv-hide-exlayer` - an external layer was hidden
* [ ] `wv-show-nearby` - nearby markers button was pushed (enabled)
* [ ] `wv-hide-nearby` - nearby markers button was pushed (disabled)"