Added new stats reporter to check suitable redis pool size

db/redis/redis.go

@@ -243,6 +243,10 @@ func (db *Redis) Ping() error {
 	return nil
 }
 
+func (db *Redis) Avail() int {
+	return db.pool.Avail()
+}
+
 func buildUsernameKey(username string) string {
 	return "username:" + strings.ToLower(username)
 }

db/redis/redis_integration_test.go

@@ -377,3 +377,8 @@ func (suite *redisTestSuite) TestPing() {
 	err := suite.Redis.Ping()
 	suite.Require().Nil(err)
 }
+
+func (suite *redisTestSuite) TestAvail() {
+	avail := suite.Redis.Avail()
+	suite.Require().True(avail > 0)
+}