Improved the monitors scan server page #15427

Job	Run time
fastbuild	1m 54s
mvn (jdk25, 25, verify javadoc:jar -DskipTests)	6m 42s
mvn (errorprone, 21, verify -Perrorprone,skipQA)	2m 50s
mvn (unit-tests, 21, verify -PskipQA -DskipTests=false)	6m 54s
mvn (compat, 21, package -DskipTests -Dversion.hadoop=3.0.3 -Dversion.zookeeper=3.6.4)	1m 25s
mvn (qa-checks, 21, verify javadoc:jar -Psec-bugs -DskipTests -Dspotbugs.timeout=3600000)	9m 17s
	29m 2s

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