We lost this in 2014 when moving from Bugzilla to Phabricator, plus this functionality is currently not available in wikimedia.biterg.io because T161926 and T161928 so would be custom SQL I guess...
2018-12-31T235959UTC = `1546300799`
2020-01-01T000000UTC = `1577836800`
Phabricator:
* How many tasks got created?
** `SELECT COUNT(tsk.dateCreated) FROM phabricator_maniphest.maniphest_task tsk WHERE tsk.dateCreated > 1546300799 AND tsk.dateCreated < 1577836800;`
* How many tasks got closed?
** `SELECT COUNT(tsk.closedEpoch) FROM phabricator_maniphest.maniphest_task tsk WHERE tsk.closedEpoch > 1546300799 AND tsk.closedEpoch < 1577836800;`
* How many people were active in Phabricator?
** `SELECT COUNT(DISTINCT authorPHID) FROM maniphest_transaction tsk WHERE tsk.dateCreated > 1546300799 AND tsk.dateCreated < 1577836800;`
* How many people created tasks?
** `SELECT COUNT(DISTINCT (tsk.authorPHID)) FROM phabricator_maniphest.maniphest_task tsk WHERE tsk.dateCreated > 1546300799 AND tsk.dateCreated < 1577836800;`
* Who created the most tasks?
** `SELECT usr.username, COUNT(usr.username) AS created FROM phabricator_user.user usr JOIN phabricator_maniphest.maniphest_task tsk WHERE tsk.authorPHID = usr.phid AND tsk.dateCreated > 1546300799 AND tsk.dateCreated < 1577836800 GROUP BY usr.username ORDER BY created DESC LIMIT 20;`
* How many people closed tasks?
** `SELECT COUNT(DISTINCT (tsk.closerPHID)) FROM phabricator_maniphest.maniphest_task tsk WHERE tsk.closedEpoch > 1546300799 AND tsk.closedEpoch < 1577836800;`
* Who closed the most tasks?
** `SELECT usr.username, COUNT(usr.username) AS closed FROM phabricator_user.user usr JOIN phabricator_maniphest.maniphest_task tsk WHERE tsk.closerPHID = usr.phid AND tsk.closedEpoch > 1546300799 AND tsk.closedEpoch < 1577836800 GROUP BY usr.username ORDER BY closed DESC LIMIT 20;`
Gerrit:
* How many patches got created in Gerrit?
** See "Gerrit 馃 Changesets" on "Gerrit 馃 Overview": https://wikimedia.biterg.io/goto/7cb967eef5dc53b06f52a9a0ee63cf5f
* How many patches got reviewed in Gerrit?
** See "Total Number of Code Reviews" on "Gerrit 馃 Approvals": https://wikimedia.biterg.io/goto/0d79dddb1f24742745d7b542945fec09
* How many people created patches in Gerrit?
** See "Gerrit 馃 Changeset Submitters" on "Gerrit 馃 Overview": https://wikimedia.biterg.io/goto/7cb967eef5dc53b06f52a9a0ee63cf5f
* Who created the most patches in Gerrit?
** See "Submitters" on "Gerrit 馃 Overview": https://wikimedia.biterg.io/goto/7cb967eef5dc53b06f52a9a0ee63cf5f
* Who reviewed the most patches in Gerrit?
** See "Approvals by Reviewer" on "Gerrit 馃 Approvals": https://wikimedia.biterg.io/goto/0d79dddb1f24742745d7b542945fec09
*drumroll* Share on wikitech-l@.