Previews: remove dashboard previews backend (#66176)

* remove dashboard previews backend

* remove dashboard previews backend

* bring back the migration

* bring back the migration

* bring back the migration

pkg/setting/setting.go

@@ -484,8 +484,6 @@ type Cfg struct {
 	// Query history
 	QueryHistoryEnabled bool
 
-	DashboardPreviews DashboardPreviewsSettings
-
 	Storage StorageSettings
 
 	Search SearchSettings
@@ -1116,7 +1114,6 @@ func (cfg *Cfg) Load(args CommandLineArgs) error {
 
 	cfg.readDataSourcesSettings()
 
-	cfg.DashboardPreviews = readDashboardPreviewsSettings(iniFile)
 	cfg.Storage = readStorageSettings(iniFile)
 	cfg.Search = readSearchSettings(iniFile)
 

pkg/setting/setting_dashboard_previews.go

@@ -1,31 +0,0 @@
-package setting
-
-import (
-	"time"
-
-	"gopkg.in/ini.v1"
-)
-
-type DashboardPreviewsSettings struct {
-	SchedulerInterval time.Duration
-	MaxCrawlDuration  time.Duration
-	RenderingTimeout  time.Duration
-	CrawlThreadCount  uint32
-}
-
-func readDashboardPreviewsSettings(iniFile *ini.File) DashboardPreviewsSettings {
-	maxThreadCount := uint32(20)
-
-	s := DashboardPreviewsSettings{}
-
-	previewsCrawlerSection := iniFile.Section("dashboard_previews.crawler")
-	s.CrawlThreadCount = uint32(previewsCrawlerSection.Key("thread_count").MustUint(6))
-	if s.CrawlThreadCount > maxThreadCount {
-		s.CrawlThreadCount = maxThreadCount
-	}
-
-	s.SchedulerInterval = previewsCrawlerSection.Key("scheduler_interval").MustDuration(12 * time.Hour)
-	s.MaxCrawlDuration = previewsCrawlerSection.Key("max_crawl_duration").MustDuration(1 * time.Hour)
-	s.RenderingTimeout = previewsCrawlerSection.Key("rendering_timeout").MustDuration(20 * time.Second)
-	return s
-}