[Issue 7450][conf] add gc log print for broker

[hezhangjian]

Fixes #7450

Motivation

Gc log is a useful tool to help our positioning our jvm runing situation. It can use to solve gc param is not reasonable, memory leak. I think if pulsar need this too.

Modifications

I modified start script, add gc log param.

Does this pull request potentially affect one of the following parts:

• Anything that affects deployment: (yes)

added jvm param.

[codelipenghui]

/pulsarbot run-failure-checks

[merlimat]

Wouldn't the GC CLI options be adapted when JVM > 1.8?

[hezhangjian]

Wouldn't the GC CLI options be adapted when JVM > 1.8?

What's your meaning ? You want to tune gc options when jvm > 1.8?

If you want to ask if gc log option can work in jvm11 or later ? It can work.

[merlimat]

@Shoothzj At least PrintGCDateStamps is not working on Java 11

[codelipenghui]

@Shoothzj Could you please take a look at the last comment?

[hezhangjian]

@Shoothzj Could you please take a look at the last comment?

I make it compat on two major java release. java8 and java11.

[codelipenghui]

@Shoothzj Seems after apply your last commit, the GC log only can enable in JDK 8 and JDK 11 right?

[hezhangjian]

@Shoothzj Seems after apply your last commit, the GC log only can enable in JDK 8 and JDK 11 right?

Yes. It's two mostly use major release version of java. Can we ignore the version less than 8 ? Then I can make it works on jdk 8 and later.