Once the session tick instrument https://gerrit.wikimedia.org/r/c/mediawiki/extensions/WikimediaEvents/+/604051 is merged in we want to activate it on an initial set of wikis (via stream configuration) for testing. This involves adding the appropriate entries in [[ https://gerrit.wikimedia.org/r/plugins/gitiles/operations/mediawiki-config/+/master/wmf-config/InitialiseSettings-labs.php | wmf-config/InitialiseSettings-labs.php ]]:
- deploymentwiki
- testwiki
Then later we can roll it out on, say, hawwiki (Hawaiian Wikipedia) in production via [[ https://gerrit.wikimedia.org/r/plugins/gitiles/operations/mediawiki-config/+/master/wmf-config/InitialiseSettings.php | wmf-config/InitialiseSettings.php ]].
And by then we'll have sampling configs and can deploy to all wikis via 'default' but set it to sample 0.01% sessions (for example).