RFR: 8374364: TestCgroupMetrics.java fails when docker service unavailable

[Jie Fu]

On Fri, 26 Dec 2025 02:17:10 GMT, SendaoYan <syan at openjdk.org> wrote:

> Hi all,
> 
> Test jdk/internal/platform/cgroup/TestCgroupMetrics.java report fails when the docker service is unavailable. The details shows in jbs issue. I think it's better to call `DockerTestUtils.checkCanTestDocker()` before run this test.
> 
> Change has been verified locally. Test-fix only, no risk.

So `MetricsTester.main(args)` requires the docker service, right?

Maybe it would be better to add this check in a place like`MetricsTester`, where it requires docker service directly.

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PR Comment: https://git.openjdk.org/jdk/pull/28996#issuecomment-3691978718