HDFS-16488. [SPS]: Expose metrics to JMX for external SPS

[tomscut]

JIRA: HDFS-16488.

Since this PR #4035 has been revert due to some problems, I submit a new one.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	13m 4s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	38m 56s		trunk passed
+1 💚	compile	1m 44s		trunk passed with JDK Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04
+1 💚	compile	1m 36s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	checkstyle	1m 24s		trunk passed
+1 💚	mvnsite	1m 45s		trunk passed
+1 💚	javadoc	1m 24s		trunk passed with JDK Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04
+1 💚	javadoc	1m 46s		trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	3m 44s		trunk passed
+1 💚	shadedclient	23m 9s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 23s		the patch passed
+1 💚	compile	1m 28s		the patch passed with JDK Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04
+1 💚	javac	1m 28s		the patch passed
+1 💚	compile	1m 21s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	javac	1m 21s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 0s		the patch passed
+1 💚	mvnsite	1m 27s		the patch passed
+1 💚	javadoc	0m 58s		the patch passed with JDK Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04
+1 💚	javadoc	1m 31s		the patch passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
+1 💚	spotbugs	3m 20s		the patch passed
+1 💚	shadedclient	22m 36s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	247m 8s		hadoop-hdfs in the patch passed.
+1 💚	asflicense	1m 14s		The patch does not generate ASF License warnings.
		369m 55s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4234/1/artifact/out/Dockerfile
GITHUB PR	#4234
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux 8b067ac834d9 4.15.0-156-generic #163-Ubuntu SMP Thu Aug 19 23:31:58 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / c0a2179
Default Java	Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4234/1/testReport/
Max. process+thread count	3074 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4234/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[tomscut]

Hi @ferhui @ayushtkn , I submit a new PR for HDFS-16488. PTAL. Thanks a lot.

[ferhui]

Thanks again. Merged

[tomscut]

Thanks @ferhui and @ayushtkn .