add metrics for workqueues

pkg/util/workqueue/queue.go

@@ -31,10 +31,15 @@ type Interface interface {
 
 // New constructs a new workqueue (see the package comment).
 func New() *Type {
+	return NewNamed("")
+}
+
+func NewNamed(name string) *Type {
 	return &Type{
 		dirty:      set{},
 		processing: set{},
 		cond:       sync.NewCond(&sync.Mutex{}),
+		metrics:    newQueueMetrics(name),
 	}
 }
 
@@ -57,6 +62,8 @@ type Type struct {
 	cond *sync.Cond
 
 	shuttingDown bool
+
+	metrics queueMetrics
 }
 
 type empty struct{}
@@ -86,10 +93,14 @@ func (q *Type) Add(item interface{}) {
 	if q.dirty.has(item) {
 		return
 	}
+
+	q.metrics.add(item)
+
 	q.dirty.insert(item)
 	if q.processing.has(item) {
 		return
 	}
+
 	q.queue = append(q.queue, item)
 	q.cond.Signal()
 }
@@ -116,9 +127,14 @@ func (q *Type) Get() (item interface{}, shutdown bool) {
 		// We must be shutting down.
 		return nil, true
 	}
+
 	item, q.queue = q.queue[0], q.queue[1:]
+
+	q.metrics.get(item)
+
 	q.processing.insert(item)
 	q.dirty.delete(item)
+
 	return item, false
 }
 
@@ -128,6 +144,9 @@ func (q *Type) Get() (item interface{}, shutdown bool) {
 func (q *Type) Done(item interface{}) {
 	q.cond.L.Lock()
 	defer q.cond.L.Unlock()
+
+	q.metrics.done(item)
+
 	q.processing.delete(item)
 	if q.dirty.has(item) {
 		q.queue = append(q.queue, item)