Add ZGC Cycles and ZGC Pauses beans support out of the box

[Kaderinho]

This PR adds OOTB support for ZGC beans.

There are some points that might be worth to discuss :

• Metrics names :
  • concept of minor and major doesn't apply to ZGC, so using the same names doesn't make sense.
  • Nonetheless, using the same names will make thing easier for getting generic dashboard for instance
• ZGC bean :
  • ZGC doesn't exist with Java 17 (see change log) but exists with JDK 14 as state in this PR (tested again and can confirm 👍). This is something we might want to write in documentation if not already here.
  • Also, what about the metrics names for ZGC ?
• GC order :
  • I think it will be easier to check if some beans are missing or to add new beans in the file if we organize it by GC instead of by Old and Young Gen collectors, especially when ZGC breaks this logic. Not so important anyway.

[jpbempel]

• Metrics names :

  • concept of minor and major doesn't apply to ZGC, so using the same names doesn't make sense.

Yet, Generational ZGC is under active development and will be added in the future.
In the meantime, using major denomination is fine as it will reclaim the whole heap.

• Nonetheless, using the same names will make thing easier for getting generic dashboard for instance

• ZGC bean :

  • ZGC doesn't exist with Java 17 (see change log) but exists with JDK 14 as state in this PR (tested again and can confirm 👍). This is something we might want to write in documentation if not already here.

yes also with the change in semantic of CollectionTime (including only pauses first then including Concurrent Time after).

• Also, what about the metrics names for ZGC ?

Fine by me.

[jpbempel]

LGTM

[truthbk]

👍