failed to install metrics

[baichinger]

How to use it?

• kwok
• kwokctl --runtime=docker (default runtime)
• kwokctl --runtime=binary
• kwokctl --runtime=nerdctl
• kwokctl --runtime=kind

What happened?

Tried to explore kubelet metrics (introduced in #199) with an in-cluster deployment. Tried with the provide test script ./test/kwokctl/kwokctl_metric_test.sh as well which resulted in the same error message:

{"time":"2023-08-08T11:57:31.228654753Z","level":"INFO","source":{"function":"sigs.k8s.io/kwok/pkg/kwok/cmd.runE","file":"/workspace/pkg/kwok/cmd/root.go","line":130},"msg":"Watch all nodes"}
{"time":"2023-08-08T11:57:31.988402793Z","level":"ERROR","source":{"function":"main.main","file":"/workspace/cmd/kwok/main.go","line":50},"msg":"Execute exit","err":"failed to install metrics: failed to create metrics update handler: failed to initialize metrics update handl
er: failed to compile metric \"fake-node\": failed to compile metric expression: ERROR: :1:23: undeclared reference to 'StartedContainersTotal' (in container '')\n | StartedContainersTotal( node.metadata.name )\n | ......................^"}

What did you expect to happen?

• Metric is registered successfully.
• Metric can be scraped.

How can we reproduce it (as minimally and precisely as possible)?

./test/kwokctl/kwokctl_metric_test.sh v1.27.4

Anything else we need to know?

No response

Kwok version

$ kwok --version
kwok version v0.3.0 go1.20.5 (linux/amd64)

$ kwokctl --version
kwokctl version v0.3.0 go1.20.5 (linux/amd64)

OS version

$ cat /etc/os-release

Arch Linux

[wzshiming]

This requires building kwok and kwokctl based on the latest branch, or switching to the 0.3 branch

[baichinger]

Great. Thanks!