This task is about making manual topic subscriptions available as a beta feature at the `===Phase 2 wikis` listed below
=== Deployment timing
This deployment is tentatively scheduled for **Wednesday, 25 August** during the [Morning backport window](https://wikitech.wikimedia.org/wiki/Deployments#deploycal-item-20210825T1800) that runs from 18:00 - 19:00 UTC.
//⚠️ Note: the deployment date will be finalized on Tuesday, 24 August once we've confirmed wikis have not raised any concerns with the plan @Whatamidoing-WMF communicated in T288704#7298872.//
=== Phase 2 wikis
//via T286096.//
|Wiki code|
|---|
| All **Wikipedias** //except// English Wikipedia
=== Requirements
For people at the partner wikis above who have the `Discussion tools` beta feature enabled, they will see the following:
1. In `Special:Preferences#mw-prefsection-betafeatures`: the `Discussion tools` beta feature should contain a list item that reads: `Receive notifications when new comments are added in sections you have subscribed to.`
2. In `Special:Preferences#mw-prefsection-editing`: a new setting within the `Discussion pages` section that contains a setting titled `Enable topic subscription` //and// this setting should be enabled by default
3. On a talk page with at least one `==H2==`, a `[ subscribe ]` affordance should appear next to it
=== Minimum test case
At each of the wikis listed beneath //Wikis to test on//, complete the //Test instructions//.
//Wikis to test on//
1. Japanese (ja.wiki)
2. Hebrew (he.wiki)
3. Bengali (bn.wiki)
4. Russian (ru.wiki)
5. Vietnamese (vi.wiki)
//Test instructions//
1. Visit `Special:Preferences#mw-prefsection-betafeatures`and verify the `Discussion tools` beta feature contains a list item that reads: `Receive notifications when new comments are added in sections you have subscribed to.`
2. Visit `Special:Preferences#mw-prefsection-editing` and verify a new setting appears within the `Discussion pages` section titled `Enable topic subscription` //and// this setting should be enabled by default
3. Visit a talk page and verify `[ subscribe ]` affordances appear next to each `==H2==`
=== Done
- [ ] All `===Requirements` are met
- [ ] All issues encountered during testing are documented