HBASE-29729 Add per-region table descriptor hash to regionServer JMX Metrics

[ajkh88]

When table descriptors are modified (e.g., changing compression settings, TTL, or column family configurations), region servers need to reopen regions to pick up these changes. However, there's currently no reliable way to detect which regions are running with stale table descriptors versus the current configuration. This makes it difficult to verify that descriptor changes have propagated correctly across all regions, increasing the risk of configuration drift and making deployment automation more challenging.

This PR adds a tableDescriptorHash field to the per-region JMX metrics exposed by region servers. The hash is a SHA-256 digest of the serialized TableDescriptor protobuf, computed once when the region is opened and exposed through the MetricsRegionWrapper interface. Regions opened with identical table descriptors will produce identical hashes, while any configuration change (compression, TTL, block size, etc.) will produce a different hash. This enables monitoring systems and deployment automation to quickly identify regions that need reopening after table descriptor changes, without parsing and comparing complex nested configuration objects.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 31s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	detsecrets	0m 1s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	hbaseanti	0m 0s		Patch does not have any anti-patterns.
			_ master Compile Tests _
+0 🆗	mvndep	0m 15s		Maven dependency ordering for branch
+1 💚	mvninstall	3m 36s		master passed
+1 💚	compile	3m 50s		master passed
+1 💚	checkstyle	1m 10s		master passed
+1 💚	spotbugs	2m 0s		master passed
+1 💚	spotless	0m 50s		branch has no errors when running spotless:check.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 12s		Maven dependency ordering for patch
+1 💚	mvninstall	3m 3s		the patch passed
+1 💚	compile	3m 51s		the patch passed
+1 💚	javac	3m 51s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 7s		the patch passed
+1 💚	spotbugs	2m 9s		the patch passed
+1 💚	hadoopcheck	12m 7s		Patch does not cause any errors with Hadoop 3.3.6 3.4.1.
+1 💚	spotless	0m 45s		patch has no errors when running spotless:check.
			_ Other Tests _
+1 💚	asflicense	0m 19s		The patch does not generate ASF License warnings.
		43m 34s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-7481/2/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#7481
Optional Tests	dupname asflicense javac spotbugs checkstyle codespell detsecrets compile hadoopcheck hbaseanti spotless
uname	Linux e7652297e2f5 5.4.0-1103-aws #111~18.04.1-Ubuntu SMP Tue May 23 20:04:10 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / ff75f81
Default Java	Eclipse Adoptium-17.0.11+9
Max. process+thread count	84 (vs. ulimit of 30000)
modules	C: hbase-hadoop-compat hbase-server U: .
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-7481/2/console
versions	git=2.34.1 maven=3.9.8 spotbugs=4.7.3
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 32s		Docker mode activated.
-0 ⚠️	yetus	0m 5s		Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --author-ignore-list --blanks-eol-ignore-file --blanks-tabs-ignore-file --quick-hadoopcheck
			_ Prechecks _
			_ master Compile Tests _
+0 🆗	mvndep	0m 20s		Maven dependency ordering for branch
+1 💚	mvninstall	3m 15s		master passed
+1 💚	compile	1m 15s		master passed
+1 💚	javadoc	0m 40s		master passed
+1 💚	shadedjars	6m 7s		branch has no errors when building our shaded downstream artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 14s		Maven dependency ordering for patch
+1 💚	mvninstall	3m 8s		the patch passed
+1 💚	compile	1m 14s		the patch passed
+1 💚	javac	1m 14s		the patch passed
+1 💚	javadoc	0m 39s		the patch passed
+1 💚	shadedjars	6m 9s		patch has no errors when building our shaded downstream artifacts.
			_ Other Tests _
+1 💚	unit	0m 35s		hbase-hadoop-compat in the patch passed.
+1 💚	unit	208m 57s		hbase-server in the patch passed.
		237m 55s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-7481/2/artifact/yetus-jdk17-hadoop3-check/output/Dockerfile
GITHUB PR	#7481
Optional Tests	javac javadoc unit compile shadedjars
uname	Linux 72eb6e45fef9 5.4.0-1103-aws #111~18.04.1-Ubuntu SMP Tue May 23 20:04:10 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / ff75f81
Default Java	Eclipse Adoptium-17.0.11+9
Test Results	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-7481/2/testReport/
Max. process+thread count	4483 (vs. ulimit of 30000)
modules	C: hbase-hadoop-compat hbase-server U: .
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-7481/2/console
versions	git=2.34.1 maven=3.9.8
Powered by	Apache Yetus 0.15.0 https://yetus.apache.org

This message was automatically generated.