OAuth 2 code was included in wmf/1.35.0-wmf.15, which started rolling out Tuesday, 14 January 2020 (and as of writing, is still active), followed by wmf/1.35.0-wmf.15 which started rolling out Tuesday, 21 January 2020...
Not saying it's for definitely the new OAuth2 code...
reedy@mwlog1001:/srv/mw-log/archive$ du -h OAuth.log-20* 5.5G OAuth.log-20191104.gz 6.6G OAuth.log-20191105.gz 6.3G OAuth.log-20191106.gz 6.8G OAuth.log-20191107.gz 6.6G OAuth.log-20191108.gz 6.7G OAuth.log-20191109.gz 6.7G OAuth.log-20191110.gz 7.0G OAuth.log-20191111.gz 6.7G OAuth.log-20191112.gz 6.3G OAuth.log-20191113.gz 6.5G OAuth.log-20191114.gz 6.4G OAuth.log-20191115.gz 6.8G OAuth.log-20191116.gz 6.9G OAuth.log-20191117.gz 7.0G OAuth.log-20191118.gz 7.5G OAuth.log-20191119.gz 7.7G OAuth.log-20191120.gz 7.0G OAuth.log-20191121.gz 7.0G OAuth.log-20191122.gz 6.9G OAuth.log-20191123.gz 7.1G OAuth.log-20191124.gz 7.4G OAuth.log-20191125.gz 6.8G OAuth.log-20191126.gz 7.2G OAuth.log-20191127.gz 6.9G OAuth.log-20191128.gz 6.8G OAuth.log-20191129.gz 6.9G OAuth.log-20191130.gz 8.8G OAuth.log-20191201.gz 5.7G OAuth.log-20191202.gz 6.0G OAuth.log-20191203.gz 5.7G OAuth.log-20191204.gz 5.1G OAuth.log-20191205.gz 6.0G OAuth.log-20191206.gz 6.5G OAuth.log-20191207.gz 7.6G OAuth.log-20191208.gz 7.8G OAuth.log-20191209.gz 7.2G OAuth.log-20191210.gz 7.5G OAuth.log-20191211.gz 7.6G OAuth.log-20191212.gz 7.1G OAuth.log-20191213.gz 7.9G OAuth.log-20191214.gz 7.6G OAuth.log-20191215.gz 7.4G OAuth.log-20191216.gz 7.7G OAuth.log-20191217.gz 7.1G OAuth.log-20191218.gz 6.8G OAuth.log-20191219.gz 7.1G OAuth.log-20191220.gz 7.4G OAuth.log-20191221.gz 7.4G OAuth.log-20191222.gz 7.0G OAuth.log-20191223.gz 7.3G OAuth.log-20191224.gz 7.7G OAuth.log-20191225.gz 7.1G OAuth.log-20191226.gz 7.7G OAuth.log-20191227.gz 7.3G OAuth.log-20191228.gz 7.3G OAuth.log-20191229.gz 7.4G OAuth.log-20191230.gz 7.5G OAuth.log-20191231.gz 7.0G OAuth.log-20200101.gz 7.2G OAuth.log-20200102.gz 7.9G OAuth.log-20200103.gz 7.7G OAuth.log-20200104.gz 6.5G OAuth.log-20200105.gz 7.4G OAuth.log-20200106.gz 6.8G OAuth.log-20200107.gz 7.1G OAuth.log-20200108.gz 6.8G OAuth.log-20200109.gz 6.6G OAuth.log-20200110.gz 7.2G OAuth.log-20200111.gz 7.4G OAuth.log-20200112.gz 8.0G OAuth.log-20200113.gz 8.0G OAuth.log-20200114.gz 7.3G OAuth.log-20200115.gz 7.0G OAuth.log-20200116.gz 6.8G OAuth.log-20200117.gz 6.9G OAuth.log-20200118.gz 6.8G OAuth.log-20200119.gz 8.4G OAuth.log-20200120.gz 8.4G OAuth.log-20200121.gz 7.3G OAuth.log-20200122.gz 7.8G OAuth.log-20200123.gz 7.9G OAuth.log-20200124.gz 9.5G OAuth.log-20200125.gz 8.4G OAuth.log-20200126.gz 8.2G OAuth.log-20200127.gz 9.0G OAuth.log-20200128.gz 9.1G OAuth.log-20200129.gz 9.4G OAuth.log-20200130.gz 9.3G OAuth.log-20200131.gz 9.3G OAuth.log-20200201.gz 9.6G OAuth.log-20200202.gz 125G OAuth.log-20200203
