* Add notification settings to storage\domain and API models. Settings are a slice to workaround XORM mapping
* Support validation of notification settings when rules are updated
* Implement route generator for Alertmanager configuration. That fetches all notification settings.
* Update multi-tenant Alertmanager to run the generator before applying the configuration.
* Add notification settings labels to state calculation
* update the Multi-tenant Alertmanager to provide validation for notification settings
* update GET API so only admins can see auto-gen
* Use suggested value for uid
* update the snapshot
* use __expr__
* replace all -100 with __expr__
* update snapshot
* more changes
* revert redundant change
* Use expr.DatasourceUID where it's possible
* generate files
* Allow pausing alerts from provisioning
* Update swagger
* Add IsPaused to provision export endpoints
* Add pause field in sample.yml
* Add exception for reset state in first loop iteration of scheduler if rule is paused
* Update provision definition and swagger docs
* Fix provisioning export tests
* Suggestion: Simplify if condition
* Add more context to a comment
