fix(scheduler): the session cleanup generator is reset too often (#2220)

This causes the "fair" scheduler to run it too often in the detriment of other generators.
The intention was to run it every 2 hours but the measurement unit for 7200 was not specified.

Add more logs, including showing a generator name, in order to troubleshoot this kind of issues easier in the future.

Signed-off-by: Andrei Aaron <aaaron@luxoft.com>

pkg/storage/common/common.go

@@ -972,6 +972,10 @@ type DedupeTaskGenerator struct {
 	Log         zlog.Logger
 }
 
+func (gen *DedupeTaskGenerator) Name() string {
+	return "DedupeTaskGenerator"
+}
+
 func (gen *DedupeTaskGenerator) Next() (scheduler.Task, error) {
 	var err error
 
@@ -1085,6 +1089,10 @@ type StorageMetricsInitGenerator struct {
 	MaxDelay int
 }
 
+func (gen *StorageMetricsInitGenerator) Name() string {
+	return "StorageMetricsInitGenerator"
+}
+
 func (gen *StorageMetricsInitGenerator) Next() (scheduler.Task, error) {
 	if gen.lastRepo == "" && gen.nextRun.IsZero() {
 		gen.rand = rand.New(rand.NewSource(time.Now().UTC().UnixNano())) //nolint: gosec

pkg/storage/gc/gc.go

@@ -800,6 +800,10 @@ func (gen *GCTaskGenerator) getRandomDelay() int {
 	return gen.rand.Intn(maxDelay)
 }
 
+func (gen *GCTaskGenerator) Name() string {
+	return "GCTaskGenerator"
+}
+
 func (gen *GCTaskGenerator) Next() (scheduler.Task, error) {
 	if gen.lastRepo == "" && gen.nextRun.IsZero() {
 		gen.rand = rand.New(rand.NewSource(time.Now().UTC().UnixNano())) //nolint: gosec