Where are my http traffic logs ? :)

Traefik Traefik v2 (latest)
1

Im running Traefik v2 as an ingress (daemonset) for my kube cluster.

I just activated access log, and generated some https traffics on my hosted website which are served by the cluster.
But i cannot see anything, no file, no logs... where it should be expected.

Name:         traefik-ingress-controller-fzqq7
Namespace:    default
Priority:     0
Node:         sd-143012/195.154.92.20
Start Time:   Sat, 16 May 2020 12:03:41 +0200
Labels:       controller-revision-hash=77f4c4765
              k8s-app=traefik-ingress-lb
              name=traefik-ingress-lb
              pod-template-generation=4
Annotations:  <none>
Status:       Running
IP:           195.154.92.20
IPs:
  IP:           195.154.92.20
Controlled By:  DaemonSet/traefik-ingress-controller
Containers:
  traefik-ingress-lb:
    Container ID:  docker://8f5bf77582d580f6acd4eeff74bd955f3c58a3e1aadea890024a9452dc395c09
    Image:         traefik:v2.1.1
    Image ID:      docker-pullable://traefik@sha256:a87b61f3254d03c4fcc0b994e2cb7af89abba8178f1fbec3bce3f4bdc080f8a6
    Port:          <none>
    Host Port:     <none>
    Args:
      --providers.kubernetescrd
      --entrypoints.web.address=:80
      --entrypoints.websecure.address=:443
      --api
      --certificatesresolvers.le.acme.email=dpac@citoyx.com
      --certificatesresolvers.le.acme.storage=/cert/acme.json
      --certificatesResolvers.le.acme.httpChallenge.entryPoint=web
      --accesslog=true
      --accesslog.filepath=/logs
      --metrics.prometheus=true
    State:          Running
      Started:      Sat, 16 May 2020 12:03:45 +0200
    Ready:          True
    Restart Count:  0
    Requests:
      cpu:        100m
      memory:     20Mi
    Environment:  <none>
    Mounts:
      /cert/ from cert (rw)
      /logs/ from logs (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from traefik-ingress-controller-token-824zl (ro)
Conditions:
  Type              Status
  Initialized       True 
  Ready             True 
  ContainersReady   True 
  PodScheduled      True 
Volumes:
  cert:
    Type:          HostPath (bare host directory volume)
    Path:          /data/kube/certs
    HostPathType:  Directory
  logs:
    Type:          HostPath (bare host directory volume)
    Path:          /data/kube/logs
    HostPathType:  Directory
  traefik-ingress-controller-token-824zl:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  traefik-ingress-controller-token-824zl
    Optional:    false
QoS Class:       Burstable
Node-Selectors:  <none>
Tolerations:     node-role.kubernetes.io/master:NoSchedule
                 node.kubernetes.io/disk-pressure:NoSchedule
                 node.kubernetes.io/memory-pressure:NoSchedule
                 node.kubernetes.io/network-unavailable:NoSchedule
                 node.kubernetes.io/not-ready:NoExecute
                 node.kubernetes.io/pid-pressure:NoSchedule
                 node.kubernetes.io/unreachable:NoExecute
                 node.kubernetes.io/unschedulable:NoSchedule
Events:
  Type    Reason     Age    From                Message
  ----    ------     ----   ----                -------
  Normal  Scheduled  8m3s   default-scheduler   Successfully assigned default/traefik-ingress-controller-fzqq7 to sd-143012
  Normal  Pulling    8m2s   kubelet, sd-143012  Pulling image "traefik:v2.1.1"
  Normal  Pulled     8m     kubelet, sd-143012  Successfully pulled image "traefik:v2.1.1"
  Normal  Created    8m     kubelet, sd-143012  Created container traefik-ingress-lb
  Normal  Started    7m59s  kubelet, sd-143012  Started container traefik-ingress-lb

this is my deployement file :

apiVersion: apps/v1
kind: DaemonSet
metadata:
 name: traefik-ingress-controller
 labels:
   k8s-app: traefik-ingress-lb
   kubernetes.io/cluster-service: "true"
spec:
 selector:
   matchLabels:
      k8s-app: traefik-ingress-lb
 template:
   metadata:
     labels:
       k8s-app: traefik-ingress-lb
       name: traefik-ingress-lb
   spec:
     hostNetwork: true
     dnsPolicy: ClusterFirstWithHostNet
     serviceAccountName: traefik-ingress-controller
     terminationGracePeriodSeconds: 60
     tolerations:
     - key: node-role.kubernetes.io/master
       effect: NoSchedule
     containers:
     - image: traefik:v2.1.1
       name: traefik-ingress-lb
       imagePullPolicy: Always
       volumeMounts:
         - mountPath: "/cert/"
           name: cert
         - mountPath: "/logs/"
           name: logs
       resources:
         requests:
           cpu: 100m
           memory: 20Mi
       args:
       - --providers.kubernetescrd
       - --entrypoints.web.address=:80
       - --entrypoints.websecure.address=:443
       - --api
       - --certificatesresolvers.le.acme.email=dpac@citoyx.com
       - --certificatesresolvers.le.acme.storage=/cert/acme.json
       - --certificatesResolvers.le.acme.httpChallenge.entryPoint=web
       - --accesslog=true
       - --accesslog.filepath=/logs
       - --metrics.prometheus=true
     volumes:
     - name: cert
       hostPath:
         path: /data/kube/certs
         type: Directory
     - name: logs
       hostPath:
         path: /data/kube/logs
         type: Directory
---

apiVersion: v1
kind: Service
metadata:
 name: traefik-web-ui
spec:
 selector:
   k8s-app: traefik-ingress-lb
   app: traefik-ingress-lb
 ports:
 - port: 443
   targetPort: 443
   name: websecure
 - port: 80
   targetPort: 80
   name: web

Accesslog and prometheus are active on the dashboard. So at least, the command line option is ok.

any helps ?