According to Codesearch, action=growthsetmentorweight is not used by GrowthExperiments code (or other MW code). Instead, action=options is used by the weight changing JS. With the switch to the structured mentor list (T264343), this API will no longer work (instead, action=growthmanagementorlist will have to be used). Since it appears to be unused, removing it looks like the best option.
Places to check before removing
- Check callers of the API (can be done using event.mediawiki_api_request in Hadoop, or api.log at mwlog1002 (T314361#8123465)
- Check user scripts (mwgrep at mwmaint1002) (T314361#8123465)
- The action=growthsetmentorweight API is no longer available