[release-12.3.1] refactor(annotations): Allow skipping always on dashboard UID migrations (#114096)

refactor(annotations): Allow skipping always on dashboard UID migrations (#113780)

(cherry picked from commit b70c6a726f)

Co-authored-by: Andres Torres <janthoe@users.noreply.github.com>

pkg/services/annotations/annotationsimpl/xorm_store.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
@@ -40,6 +41,8 @@ func validateTimeRange(item *annotations.Item) error {
 	return nil
 }
 
+var xormMigrationTrigger sync.Once
+
 type xormRepositoryImpl struct {
 	cfg                *setting.Cfg
 	db                 db.DB
@@ -51,10 +54,9 @@ type xormRepositoryImpl struct {
 }
 
 func NewXormStore(cfg *setting.Cfg, l log.Logger, db db.DB, tagService tag.Service, reg prometheus.Registerer) *xormRepositoryImpl {
-	err := migrations.RunDashboardUIDMigrations(db.GetEngine().NewSession(), db.GetEngine().DriverName())
-	if err != nil {
-		l.Error("failed to populate dashboard_uid for annotations", "error", err)
-	}
+	xormMigrationTrigger.Do(func() {
+		triggerAlwaysOnMigrations(cfg, l, db)
+	})
 
 	repo := &xormRepositoryImpl{
 		cfg:        cfg,
@@ -96,6 +98,19 @@ func NewXormStore(cfg *setting.Cfg, l log.Logger, db db.DB, tagService tag.Servi
 	return repo
 }
 
+func triggerAlwaysOnMigrations(cfg *setting.Cfg, l log.Logger, db db.DB) {
+	sec := cfg.Raw.Section("database")
+	skipDashboardUIDMigration := sec.Key("skip_dashboard_uid_migration_on_startup").MustBool(false)
+	if skipDashboardUIDMigration {
+		l.Debug("skipped dashboard UID startup migration")
+		return
+	}
+	err := migrations.RunDashboardUIDMigrations(db.GetEngine().NewSession(), db.GetEngine().DriverName())
+	if err != nil {
+		l.Error("failed to populate dashboard_uid for annotations", "error", err)
+	}
+}
+
 func (r *xormRepositoryImpl) Type() string {
 	return "sql"
 }