* Use multi-level logging for shared channel and remote cluster service errors
Service-specific log levels (LvlRemoteClusterServiceError, LvlSharedChannelServiceError)
were hidden from the main log by default, requiring explicit configuration to see them.
Switch all call sites to use LogM with multi-level combos so each log line is attributed
to both the standard level (error/warn) and the service-specific level. This surfaces
errors in the main log while preserving the ability to isolate them into dedicated files.
Each instance was reviewed and either kept as error (DB failures, security issues, config
errors, exhausted retries on critical data) or downgraded to warn (transient network
failures, remote-side reported errors with retry logic, non-critical data like profile
images, reactions, acknowledgements, and status).
- Remove NotificationLogSettings configuration entirely
- Add new notification-specific log levels (NotificationError, NotificationWarn, NotificationInfo, NotificationDebug, NotificationTrace)
- Consolidate all notification logs into standard mattermost.log file
- Update all notification logging code to use new multi-level logging (MlvlNotification*)
- Remove notification logger infrastructure and support packet integration
- Update test configurations and remove deprecated functionality tests
- Add comprehensive tests for new notification log levels
This change simplifies log analysis by unifying all application logging while maintaining flexibility through Advanced Logging configuration for administrators who need separate notification logs.
🤖 Generated with [Claude Code](https://claude.ai/code)
---------
Co-authored-by: Claude <noreply@anthropic.com>
It was a good decision in hindsight to keep the public module as 0.x
because this would have been a breaking change again.
https://mattermost.atlassian.net/browse/MM-53032
```release-note
Changed the Go module path from github.com/mattermost/mattermost-server/server/v8 to github.com/mattermost/mattermost/server/v8.
For the public facing module, it's path is also changed from github.com/mattermost/mattermost-server/server/public to github.com/mattermost/mattermost/server/public
```
