Switch stat logging to debugf()

[nwneisen]

Fixes #258

Logs before making this change:

Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Connecting to docker on the Endpoint unix:///var/run/docker.sock"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Start docker client with request timeout 0s"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Hairpin mode is set to hairpin-veth"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Loaded network plugin cni"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Docker cri networking managed by network plugin cni"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Setting cgroupDriver systemd"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Docker cri received runtime config &RuntimeConfig{NetworkConfig:&NetworkConfig{PodCidr:,},}"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Starting the GRPC backend for the Docker CRI interface."
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Start cri-dockerd grpc backend"
...
Oct 16 16:02:01 minikube cri-dockerd[2695]: time="2023-10-16T16:02:01Z" level=info msg="Number of pod containers: 8"
Oct 16 16:02:02 minikube cri-dockerd[2695]: time="2023-10-16T16:02:02Z" level=info msg="End ListContainerStats. Number of stats:8, Time taken: 1.010881467s"
Oct 16 16:02:12 minikube cri-dockerd[2695]: time="2023-10-16T16:02:12Z" level=info msg="Begin ListContainerStats"
Oct 16 16:02:12 minikube cri-dockerd[2695]: time="2023-10-16T16:02:12Z" level=info msg="Number of pod containers: 8"
Oct 16 16:02:13 minikube cri-dockerd[2695]: time="2023-10-16T16:02:13Z" level=info msg="End ListContainerStats. Number of stats:8, Time taken: 1.019785021s"
Oct 16 16:02:23 minikube cri-dockerd[2695]: time="2023-10-16T16:02:23Z" level=info msg="Filesystem usage containing '/var/lib/docker': usedBytes=214736613376, iNodesUsed=4770289"
Oct 16 16:02:23 minikube cri-dockerd[2695]: time="2023-10-16T16:02:23Z" level=info msg="Total used bytes by docker images: 736076745"
Oct 16 16:02:23 minikube cri-dockerd[2695]: time="2023-10-16T16:02:23Z" level=info msg="Begin ListContainerStats"
Oct 16 16:02:23 minikube cri-dockerd[2695]: time="2023-10-16T16:02:23Z" level=info msg="Number of pod containers: 8"
Oct 16 16:02:24 minikube cri-dockerd[2695]: time="2023-10-16T16:02:24Z" level=info msg="End ListContainerStats. Number of stats:8, Time taken: 1.019527026s"
....

Logs after:

Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Connecting to docker on the Endpoint unix:///var/run/docker.sock"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Start docker client with request timeout 0s"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Hairpin mode is set to hairpin-veth"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Loaded network plugin cni"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Docker cri networking managed by network plugin cni"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Setting cgroupDriver systemd"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Docker cri received runtime config &RuntimeConfig{NetworkConfig:&NetworkConfig{PodCidr:,},}"
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Starting the GRPC backend for the Docker CRI interface."
Oct 16 16:30:14 minikube cri-dockerd[3700]: time="2023-10-16T16:30:14Z" level=info msg="Start cri-dockerd grpc backend"

Proposed Changes

• Change stats logging calls to debugf()