Investigate Support containerD and maybe the other container runtimes

[xiaomi7732]

K8s doc:

• https://kubernetes.io/docs/setup/production-environment/container-runtimes/

[xiaomi7732]

At the end of the day, the question is:

• how to get container id from with in the running container?

/proc/self/cgroup has been giving us a good run but the mechanism is falling apart as cGruopV2 kicks in.

From docker container side, it is asked, not too much progress moving forward:

• provide a portable mechanism for processes within container to obtain their image and container ids opencontainers/runtime-spec#1105

From K8s side, there is no conclusion either:

• how to get the container id in pod? kubernetes/kubernetes#50309

[xiaomi7732]

Another related issue, although on imageId, not containerId: kubernetes/kubernetes#80346

[xiaomi7732]

We landed at the point that supports cgroupv1 and cgroupv2 with the most common runtimes (containerD and docker engine.

Package released: https://www.nuget.org/packages/Microsoft.ApplicationInsights.Kubernetes/2.0.4-beta2