RFR: 8203359: Container level resources events [v8]

[Jaroslav Bachorik]

On Wed, 14 Apr 2021 10:25:09 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

>> Jaroslav Bachorik has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 11 additional commits since the last revision:
>> 
>>  - Roll back conditional registration of container events
>>  - Remove container events flag
>>  - Remove trailing spaces
>>  - Doh
>>  - Report container type and register events conditionally
>>  - Remove unused test files
>>  - Initial test support for JFR container events
>>  - Update the JFR control files
>>  - Split off the CPU throttling metrics
>>  - Formatting spaces
>>  - ... and 1 more: https://git.openjdk.java.net/jdk/compare/19aad098...67a61bd7
>
> src/jdk.jfr/share/classes/jdk/jfr/events/ContainerCPUThrottlingEvent.java line 44:
> 
>> 42: @Category({"Operating System", "Container", "Processor"})
>> 43: @Description("Container CPU throttling related information.")
>> 44: public class ContainerCPUThrottlingEvent extends AbstractJDKEvent {
> 
> I wonder if we should put all the container events in the same category {"Operating System", "Container"}, Or possibly add them under the already existing categories under "Operating System"?

I guess we could fit those events under `Operating System/Memory` and `Operating System/Processor` categories.
What about I/O? Currently, there is only `Operating System/Network` category. The options are:
* Add `Operating System/IO` category and move `Network` to `Operating System/IO/Network`
* Add `Operation System/FileSystem` category and move the container IO event there

What would you prefer?

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PR: https://git.openjdk.java.net/jdk/pull/3126