fix

app/storage/mongo/collections/tasks.go

@@ -33,6 +33,14 @@ type InsertedTask struct {
 	Attempts         int        `bson:"attempts"`
 }
 
+func Count() (*int64, error) {
+	count, err := collection().CountDocuments(context.TODO(), bson.M{})
+	if err != nil {
+		return nil, err
+	}
+	return &count, nil
+}
+
 func Add(task InsertedTask) error {
 	_, err := collection().InsertOne(context.TODO(), task)
 	if err != nil {

main.go

@@ -9,6 +9,7 @@ import (
 	"os"
 	"queues-go/app/routers"
 	client "queues-go/app/storage/mongo"
+	tasks "queues-go/app/storage/mongo/collections"
 	"strconv"
 	"sync"
 	"time"
@@ -58,6 +59,30 @@ func metricProxy(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(202)
 }
 
+func writeCount() {
+	for {
+		count, err := tasks.Count()
+		if err != nil {
+			log.Printf("Failed getting docs count: %s", err.Error())
+		} else {
+			loc, _ := time.LoadLocation("Europe/Moscow")
+			s := fmt.Sprintf(
+				`{"timestamp":"%s","service":"queues","environment":"%s","name":"tasks","count":%s}`,
+				time.Now().In(loc).Format("2006-01-02T15:04:05Z"),
+				os.Getenv("STAGE"),
+				strconv.Itoa(int(*count)),
+			)
+			data := []byte(s)
+			r := bytes.NewReader(data)
+			_, err := http.Post("http://monitoring:1237/api/v1/metrics/increment", "application/json", r)
+			if err != nil {
+				log.Printf("ERROR %s", err.Error())
+			}
+		}
+		time.Sleep(time.Second)
+	}
+}
+
 func main() {
 	client.Connect()
 	routers.MutexMap = make(map[string]*sync.Mutex)
@@ -66,5 +91,6 @@ func main() {
 	http.HandleFunc("/api/v1/put", handlerWrapper(routers.Put))
 	http.HandleFunc("/api/v1/metric", metricProxy)
 	log.Printf("Server started")
+	go writeCount()
 	http.ListenAndServe(":1239", nil)
 }