feat(host_metrics source): Add additional cgroup memory metrics

[nionata]

Summary

Add active and inactive metrics for anon and file memory to the cgroup collector. These additional metrics allow you to better understand the existing cgroup memory metrics. The new metrics follow reverse domain name notation. I opted to do this over keep the ordering in the memory.stat file to increase querying ergonomics.

Change Type

• Bug fix
• New feature
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

How did you test this PR?

cargo fmt

cargo clippy --all-targets
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.87s

cargo test
test result: ok. 1628 passed; 0 failed; 3 ignored; 0 measured; 0 filtered out; finished in 21.40s

     Running tests/e2e/mod.rs (target/debug/deps/e2e-9fbb4963c350fe5f)

./scripts/check_changelog_fragments.sh
validating 'add_active_and_inactive_cgroup_memory_metrics.feature.md'
changelog additions are valid.

make environment CONTAINER_TOOL="podman"

/git/vectordotdev/vector# mkdir /etc/vector && cat << EOF > /etc/vector/vector.yaml
> sources:
>   in:
>     type: "host_metrics"
>     collectors:
>       - "cgroups"
>     cgroups:
>       base: ""
> 
> sinks:
>   out:
>     inputs:
>       - "in"
>     type: "console"
>     encoding:
>       codec: "native_json"
> EOF

/git/vectordotdev/vector# cargo run | jq '.metric.name, .metric.gauge.value'
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.35s
     Running `target/debug/vector`
2025-01-10T01:54:02.356851Z  INFO vector::app: Log level is enabled. level="info"
2025-01-10T01:54:02.359020Z  INFO vector::app: Loading configs. paths=["/etc/vector/vector.yaml"]
2025-01-10T01:54:02.364879Z  INFO source{component_kind="source" component_id=in component_type=host_metrics}: vector::sources::host_metrics: PROCFS_ROOT is unset. Using default '/proc' for procfs root.
2025-01-10T01:54:02.364942Z  INFO source{component_kind="source" component_id=in component_type=host_metrics}: vector::sources::host_metrics: SYSFS_ROOT is unset. Using default '/sys' for sysfs root.
2025-01-10T01:54:02.365956Z  INFO vector::topology::running: Running healthchecks.
2025-01-10T01:54:02.366216Z  INFO vector::topology::builder: Healthcheck passed.
2025-01-10T01:54:02.366282Z  INFO vector: Vector has started. debug="true" version="0.44.0" arch="x86_64" revision=""
2025-01-10T01:54:02.366326Z  INFO vector::app: API is disabled, enable by setting `api.enabled` to `true` and use commands like `vector top`.
"cgroup_cpu_usage_seconds_total"
null
"cgroup_cpu_user_seconds_total"
null
"cgroup_cpu_system_seconds_total"
null
"cgroup_memory_current_bytes"
11895951360
"cgroup_memory_anon_bytes"
25882624
"cgroup_memory_file_bytes"
11654889472
"cgroup_memory_anon_active_bytes"
20480
"cgroup_memory_anon_inactive_bytes"
25440256
"cgroup_memory_file_active_bytes"
542707712
"cgroup_memory_file_inactive_bytes"
11112181760

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the "no-changelog" label to this PR.

Checklist

• Please read our Vector contributor resources.
• If this PR introduces changes Vector dependencies (modifies Cargo.lock), please
  run dd-rust-license-tool write to regenerate the license inventory and commit the changes (if any). More details here.

References

https://docs.kernel.org/admin-guide/cgroup-v2.html

[nionata]

Thanks for the stamp @jhgilbert! Is there anything else y'all need from me to get this merged?

[pront]

Thanks @nionata