HDFS-17561. Make HeartbeatManager.Monitor use up-to-date heartbeatRecheckInterval

[kokonguyen191]

Description of PR

(rebased and reopened due to being auto close some time back)

DatanodeManager can changes heartbeatRecheckInterval via reconf API but HeartbeatManager's copy of heartbeatRecheckInterval is fixed at initialization and won't update when DatanodeManager updates with a new config.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 1s		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 💚	test4tests	0m 0s		The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	35m 35s		trunk passed
+1 💚	compile	1m 27s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	compile	1m 28s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	checkstyle	0m 59s		trunk passed
+1 💚	mvnsite	1m 38s		trunk passed
+1 💚	javadoc	1m 12s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javadoc	1m 11s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
-1 ❌	spotbugs	3m 59s	/branch-spotbugs-hadoop-hdfs-project_hadoop-hdfs-warnings.html	hadoop-hdfs-project/hadoop-hdfs in trunk has 291 extant spotbugs warnings.
+1 💚	shadedclient	30m 42s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	1m 30s		the patch passed
+1 💚	compile	1m 21s		the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javac	1m 21s		the patch passed
+1 💚	compile	1m 24s		the patch passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	javac	1m 24s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 43s		hadoop-hdfs-project/hadoop-hdfs: The patch generated 0 new + 45 unchanged - 16 fixed = 45 total (was 61)
+1 💚	mvnsite	1m 31s		the patch passed
-1 ❌	javadoc	0m 59s	/results-javadoc-javadoc-hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-21.0.7+6-Ubuntu-0ubuntu120.04.txt	hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-21.0.7+6-Ubuntu-0ubuntu120.04 with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04 generated 2 new + 9998 unchanged - 2 fixed = 10000 total (was 10000)
-1 ❌	javadoc	1m 0s	/results-javadoc-javadoc-hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-17.0.15+6-Ubuntu-0ubuntu120.04.txt	hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-17.0.15+6-Ubuntu-0ubuntu120.04 with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04 generated 2 new + 9671 unchanged - 0 fixed = 9673 total (was 9671)
+1 💚	spotbugs	3m 53s		the patch passed
+1 💚	shadedclient	29m 58s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	282m 14s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch passed.
+1 💚	asflicense	1m 19s		The patch does not generate ASF License warnings.
		402m 40s

Reason	Tests
Failed junit tests	hadoop.hdfs.server.namenode.ha.TestStandbyCheckpoints
	hadoop.hdfs.tools.TestDFSAdmin

Subsystem	Report/Notes
Docker	ClientAPI=1.52 ServerAPI=1.52 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8073/1/artifact/out/Dockerfile
GITHUB PR	#8073
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 9679c06fc5a4 5.15.0-153-generic #163-Ubuntu SMP Thu Aug 7 16:37:18 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 0f0de4f
Default Java	Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
Multi-JDK versions	/usr/lib/jvm/java-21-openjdk-amd64:Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-17-openjdk-amd64:Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8073/1/testReport/
Max. process+thread count	3090 (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-8073/1/console
versions	git=2.25.1 maven=3.9.11 spotbugs=4.9.7
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