Followers server

[dcadenas]

• Implement a server that calculates the diff between nostr contact lists (kind 3) and detect follows and unfollows.
• Connect to notifications server through a google pubsub
• Ansible playbook
• Consume follows pubsub from Notification server
• Follower server tests
• Switch from test relay to wss://relay.nos.social
• Use settings.production.yml in ansible
• Collpase follow events toggled in rapid succession
• Follower server grafana dashboard and more metrics
• Add some method to ignore followers from initial follow list never seen before if it's much older than the account creation date (kind 0 can be used for this comparison). It's an heuristic to avoid receiving follow notifications from people that followed you a long time ago
• Create notifications with counters that include the details in the payload for users with too many followers.
• Create a backfill for existent contact lists in the relay. We could ignore most old lists though, we'd just have less notifications from older accounts, see previous item - Nice to have, but it would reduce the initial surge of new follower notifications that were in fact following the user a long time ago.
• Check contact lists with no content that have the Nos tag, ensure a grafana alert is triggered. Context here
• Move server to production droplet. I ended up pointing followers.nos.social to my dev server, now I need a new dev server!)
• Add notification server changes to deal with the new localized notifications done in localize follows notification #1446 nos#1483
• Fix neo4j web dashboard access - Nice to have, specially for future idea, like algorithms (trust network, clustering, community finding, follow recommendations), queries to DB, etc #24
• Split neo4j db into it's own instance (@gergelypolonkai has something ready for this)
• Read notification metadata so that tapping on it opens the correct profile (iOS team)
• Localized notifications as explained here (iOS team, at least partially, some changes on the notifications service too)

[setch-l]

@dcadenas - As part of this work are you planning to turn off the unfollow Notifications? I'm still getting them. If so do you need a ticket for this or do you want to add it to the check list above?

[dcadenas]

Yes, those will be part of my notification server changes item. I won't send unfollowed info although unfollows will properly be reflected in the db and the app will have that info available if it decides to consume it

[dcadenas]

@setch-l this is still needing a review for the ansible script PR but we are moving away from it so maybe it's only useful as an example and I don't think the epic should be blocked by that. I disabled the feature flags as it's the only real way to test if the notifications server handles the new events well.

It's already live but a UAT pass will be useful anyways, maybe it's a better idea so have some kind of demo like exploration?