[I] metric occurs even when there is no traffic. [apisix]

[via GitHub]

Ari-suhyeon opened a new issue, #11108:
URL: https://github.com/apache/apisix/issues/11108

   ### Description
   
   I installed apisix on EKS with helm chart (apisix-2.6.0, APP VERSION 3.8.0).
   After changing the deployment replicas of apisix from 1 to 10, I noticed 
that the metrics went up even though I didn't load test them.
   Why is this happening?
   
![image](https://github.com/apache/apisix/assets/121844970/b2753bd8-2a36-4a1d-bdeb-28331be2d0a6)
   
   helm values.yaml
   ```yaml
   ingress-controller:
     enabled: true
     config:
       apisix:
         serviceNamespace: apisix
   
   apisix:
     plugins:
       - prometheus
       - public-api
     pluginAttrs:
       prometheus: 
         export_uri: /apisix/prometheus/metrics 
         metric_prefix: apisix_ 
         enable_export_server: true 
         export_addr: 
           ip: 0.0.0.0 
           port: 9091 
         prefer_name: true
   
   metrics:
     serviceMonitor:
       enabled: true
       namespace: apisix
       name: apisix-service-monitor
       interval: "15s"
   
   service:
     type: LoadBalancer
   
   resources:
     limits:
       memory: "2Gi"
       cpu: "2"
     requests:
       memory: "2Gi"
       cpu: "2"
   ```
   
   resource.yaml
   ```yaml
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     namespace: apisix
     name: test-dp
     labels:
       app: test
   spec:
     replicas: 1
     selector:
       matchLabels:
         app: test
     template:
       metadata:
         labels:
           app: test
       spec:
         containers:
           ...
   ---
   apiVersion: v1
   kind: Service
   metadata:
     namespace: apisix
     name: test-svc
   spec:
     selector:
       app: test
     ports:
       - protocol: TCP
         port: 80
         targetPort: 3100
   ---
   apiVersion: apisix.apache.org/v2
   kind: ApisixRoute
   metadata:
     namespace: apisix
     name: apisix-route
   spec:
     http:
       - name: port-route
         match:
           hosts:
             - XXXXX
           paths:
             - /*
         backends:
           - serviceName: test-svc
             servicePort: 80
   ```
   
   ### Environment
   
   - APISIX version (run `apisix version`):
   - Operating system (run `uname -a`):
   - OpenResty / Nginx version (run `openresty -V` or `nginx -V`):
   - etcd version, if relevant (run `curl 
http://127.0.0.1:9090/v1/server_info`):
   - APISIX Dashboard version, if relevant:
   - Plugin runner version, for issues related to plugin runners:
   - LuaRocks version, for installation issues (run `luarocks --version`):
   


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