feat(metrics): add scheduler related metrics (#2076)

Signed-off-by: Alexei Dodon <adodon@cisco.com>

pkg/extensions/search/cve/scan.go

@@ -2,6 +2,7 @@ package cveinfo
 
 import (
 	"context"
+	"fmt"
 	"sync"
 
 	"zotregistry.io/zot/pkg/log"
@@ -194,3 +195,12 @@ func (st *scanTask) DoWork(ctx context.Context) error {
 
 	return nil
 }
+
+func (st *scanTask) String() string {
+	return fmt.Sprintf("{Name: \"%s\", repo: \"%s\", digest: \"%s\"}",
+		st.Name(), st.repo, st.digest)
+}
+
+func (st *scanTask) Name() string {
+	return "ScanTask"
+}

pkg/extensions/search/cve/scan_test.go

@@ -57,7 +57,8 @@ func TestScanGeneratorWithMockedData(t *testing.T) { //nolint: gocyclo
 
 		cfg := config.New()
 		cfg.Scheduler = &config.SchedulerConfig{NumWorkers: 3}
-		sch := scheduler.NewScheduler(cfg, logger)
+		metrics := monitoring.NewMetricsServer(true, logger)
+		sch := scheduler.NewScheduler(cfg, metrics, logger)
 
 		params := boltdb.DBParameters{
 			RootDir: t.TempDir(),
@@ -502,8 +503,9 @@ func TestScanGeneratorWithRealData(t *testing.T) {
 		metaDB, err := boltdb.New(boltDriver, logger)
 		So(err, ShouldBeNil)
 
+		metrics := monitoring.NewMetricsServer(true, logger)
 		imageStore := local.NewImageStore(rootDir, false, false,
-			logger, monitoring.NewMetricsServer(false, logger), nil, nil)
+			logger, metrics, nil, nil)
 		storeController := storage.StoreController{DefaultStore: imageStore}
 
 		image := CreateRandomVulnerableImage()
@@ -520,7 +522,7 @@ func TestScanGeneratorWithRealData(t *testing.T) {
 
 		So(scanner.IsResultCached(image.DigestStr()), ShouldBeFalse)
 
-		sch := scheduler.NewScheduler(cfg, logger)
+		sch := scheduler.NewScheduler(cfg, metrics, logger)
 
 		generator := cveinfo.NewScanTaskGenerator(metaDB, scanner, logger)
 

pkg/extensions/search/cve/update.go

@@ -2,6 +2,7 @@ package cveinfo
 
 import (
 	"context"
+	"fmt"
 	"sync"
 	"time"
 
@@ -118,3 +119,11 @@ func (dbt *dbUpdateTask) DoWork(ctx context.Context) error {
 
 	return nil
 }
+
+func (dbt *dbUpdateTask) String() string {
+	return fmt.Sprintf("{Name: %s}", dbt.Name())
+}
+
+func (dbt *dbUpdateTask) Name() string {
+	return "DBUpdateTask"
+}

pkg/extensions/search/cve/update_test.go

@@ -14,6 +14,7 @@ import (
 	. "github.com/smartystreets/goconvey/convey"
 
 	"zotregistry.io/zot/pkg/api/config"
+	"zotregistry.io/zot/pkg/extensions/monitoring"
 	cveinfo "zotregistry.io/zot/pkg/extensions/search/cve"
 	"zotregistry.io/zot/pkg/log"
 	mTypes "zotregistry.io/zot/pkg/meta/types"
@@ -37,7 +38,8 @@ func TestCVEDBGenerator(t *testing.T) {
 
 		cfg := config.New()
 		cfg.Scheduler = &config.SchedulerConfig{NumWorkers: 3}
-		sch := scheduler.NewScheduler(cfg, logger)
+		metrics := monitoring.NewMetricsServer(true, logger)
+		sch := scheduler.NewScheduler(cfg, metrics, logger)
 
 		metaDB := &mocks.MetaDBMock{
 			GetRepoMetaFn: func(ctx context.Context, repo string) (mTypes.RepoMeta, error) {