Merge pull request #9141 from dmcgowan/config-migration

Add support for plugin config migration

services/server/server.go

@@ -203,6 +203,19 @@ func New(ctx context.Context, config *srvconfig.Config) (*Server, error) {
 		required[r] = struct{}{}
 	}
 
+	// Run migration for each configuration version
+	// Run each plugin migration for each version to ensure that migration logic is simple and
+	// focused on upgrading from one version at a time.
+	for v := config.Version; v < srvconfig.CurrentConfigVersion; v++ {
+		for _, p := range plugins {
+			if p.ConfigMigration != nil {
+				if err := p.ConfigMigration(ctx, v, config.Plugins); err != nil {
+					return nil, err
+				}
+			}
+		}
+	}
+
 	for _, p := range plugins {
 		id := p.URI()
 		log.G(ctx).WithField("type", p.Type).Infof("loading plugin %q...", id)