Datasources: Add toggle to control default behaviour of 'Manage alerts via Alerts UI' toggle (#98441)

* Datasources: Add toggle to control default behaviour of 'Manage alerts via Alerts UI' toggle

* Update documentation with suggestions

Co-authored-by: Larissa Wandzura <126723338+lwandz13@users.noreply.github.com>

pkg/api/dtos/frontend_settings.go

@@ -242,6 +242,8 @@ type FrontendSettingsDTO struct {
 
 	Azure FrontendSettingsAzureDTO `json:"azure"`
 
+	DefaultDatasourceManageAlertsUIToggle bool `json:"defaultDatasourceManageAlertsUiToggle"`
+
 	Caching                 FrontendSettingsCachingDTO         `json:"caching"`
 	RecordedQueries         FrontendSettingsRecordedQueriesDTO `json:"recordedQueries"`
 	Reporting               FrontendSettingsReportingDTO       `json:"reporting"`

pkg/api/frontendsettings.go

@@ -245,6 +245,8 @@ func (hs *HTTPServer) getFrontendSettings(c *contextmodel.ReqContext) (*dtos.Fro
 		ReportingStaticContext:              hs.Cfg.ReportingStaticContext,
 		ExploreDefaultTimeOffset:            hs.Cfg.ExploreDefaultTimeOffset,
 
+		DefaultDatasourceManageAlertsUIToggle: hs.Cfg.DefaultDatasourceManageAlertsUIToggle,
+
 		BuildInfo: dtos.FrontendSettingsBuildInfoDTO{
 			HideVersion:   hideVersion,
 			Version:       version,

pkg/setting/setting.go

@@ -330,6 +330,9 @@ type Cfg struct {
 	DataSourceLimit int
 	// Number of queries to be executed concurrently. Only for the datasource supports concurrency.
 	ConcurrentQueryCount int
+	// Default behavior for the "Manage alerts via Alerting UI" toggle when configuring a data source.
+	// It only works if the data source's `jsonData.manageAlerts` prop does not contain a previously configured value.
+	DefaultDatasourceManageAlertsUIToggle bool
 
 	// IP range access control
 	IPRangeACEnabled     bool
@@ -1914,6 +1917,7 @@ func (cfg *Cfg) readDataSourcesSettings() {
 	datasources := cfg.Raw.Section("datasources")
 	cfg.DataSourceLimit = datasources.Key("datasource_limit").MustInt(5000)
 	cfg.ConcurrentQueryCount = datasources.Key("concurrent_query_count").MustInt(10)
+	cfg.DefaultDatasourceManageAlertsUIToggle = datasources.Key("default_manage_alerts_ui_toggle").MustBool(true)
 }
 
 func (cfg *Cfg) readDataSourceSecuritySettings() {