HBASE-26745: Include balancer cost metrics in jmx endpoint

[briaugenreich]

Enable the balancer cost metrics to be included in the /jmx endpoint. This should be backwards compatible.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 16s	Docker mode activated.
-0 ⚠️	yetus	0m 2s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ master Compile Tests _
+1 💚	mvninstall	3m 29s	master passed
+1 💚	compile	0m 13s	master passed
+1 💚	shadedjars	4m 41s	branch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 17s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	2m 52s	the patch passed
+1 💚	compile	0m 14s	the patch passed
+1 💚	javac	0m 13s	the patch passed
+1 💚	shadedjars	4m 18s	patch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 9s	the patch passed
		_ Other Tests _
+1 💚	unit	0m 47s	hbase-http in the patch passed.
		19m 7s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4140/1/artifact/yetus-jdk8-hadoop3-check/output/Dockerfile
GITHUB PR	#4140
JIRA Issue	HBASE-26745
Optional Tests	javac javadoc unit shadedjars compile
uname	Linux 65135f21d4c3 5.4.0-1043-aws #45~18.04.1-Ubuntu SMP Fri Apr 9 23:32:25 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / f869917
Default Java	AdoptOpenJDK-1.8.0_282-b08
Test Results	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4140/1/testReport/
Max. process+thread count	273 (vs. ulimit of 30000)
modules	C: hbase-http U: hbase-http
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4140/1/console
versions	git=2.17.1 maven=3.6.3
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 16s	Docker mode activated.
-0 ⚠️	yetus	0m 3s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ master Compile Tests _
+1 💚	mvninstall	3m 42s	master passed
+1 💚	compile	0m 23s	master passed
+1 💚	shadedjars	5m 14s	branch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 14s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	3m 5s	the patch passed
+1 💚	compile	0m 15s	the patch passed
+1 💚	javac	0m 15s	the patch passed
+1 💚	shadedjars	4m 4s	patch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 11s	the patch passed
		_ Other Tests _
+1 💚	unit	0m 57s	hbase-http in the patch passed.
		20m 1s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4140/1/artifact/yetus-jdk11-hadoop3-check/output/Dockerfile
GITHUB PR	#4140
JIRA Issue	HBASE-26745
Optional Tests	javac javadoc unit shadedjars compile
uname	Linux f6a626c3a364 5.4.0-90-generic #101-Ubuntu SMP Fri Oct 15 20:00:55 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / f869917
Default Java	AdoptOpenJDK-11.0.10+9
Test Results	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4140/1/testReport/
Max. process+thread count	153 (vs. ulimit of 30000)
modules	C: hbase-http U: hbase-http
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4140/1/console
versions	git=2.17.1 maven=3.6.3
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 23s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	hbaseanti	0m 0s	Patch does not have any anti-patterns.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ master Compile Tests _
+1 💚	mvninstall	3m 31s	master passed
+1 💚	compile	0m 25s	master passed
+1 💚	checkstyle	0m 11s	master passed
+1 💚	spotbugs	0m 33s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	2m 45s	the patch passed
+1 💚	compile	0m 18s	the patch passed
+1 💚	javac	0m 18s	the patch passed
+1 💚	checkstyle	0m 8s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	hadoopcheck	12m 55s	Patch does not cause any errors with Hadoop 3.1.2 3.2.2 3.3.1.
+1 💚	spotbugs	0m 24s	the patch passed
		_ Other Tests _
+1 💚	asflicense	0m 8s	The patch does not generate ASF License warnings.
		27m 36s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4140/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#4140
JIRA Issue	HBASE-26745
Optional Tests	dupname asflicense javac spotbugs hadoopcheck hbaseanti checkstyle compile
uname	Linux fff76da64808 5.4.0-1043-aws #45~18.04.1-Ubuntu SMP Fri Apr 9 23:32:25 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / f869917
Default Java	AdoptOpenJDK-1.8.0_282-b08
Max. process+thread count	60 (vs. ulimit of 30000)
modules	C: hbase-http U: hbase-http
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-4140/1/console
versions	git=2.17.1 maven=3.6.3 spotbugs=4.2.2
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[bbeaudreault]

LGTM. We've also had this patch running internally at our company for a few years without issue