Developers of API-using tools likely would find it useful to be able to access a report detailing the hits from a user agent to deprecated API features, as the existing deprecation warnings delivered to the client may not be seen by the developer of the tool.tails at https://www.mediawiki.org/wiki/API/Architecture_work/Planning#Deprecated_API_usage_report_on_WMF_wikis
Input to this tool would be a User-Agent and a date range.The extension exposes certain sanitized data about the usage of deprecated API features logged on the server, Output would be a list deprecated API features hit by that agent with a count per dayas the existing deprecation warnings delivered to the client may not be seen by the developer of the tool.
Besides the extension itself, see https://www.mediawiki.org/wiki/API/Architecture_work/Planning#Deprecated_API_usage_report_on_WMF_wikis for a possible example[[https://gerrit.wikimedia.org/r/#/c/173336/|Gerrit change 173336]] is required to populate the data in Elasticsearch.