Revert "[improve][broker][branch-2.10] Backport Linux metrics changes…

… from master branch (apache#20659)"

This reverts commit b355d31.

bin/pulsar

@@ -322,8 +322,6 @@ if [[ -z "$IS_JAVA_8" ]]; then
     OPTS="$OPTS --add-opens java.management/sun.management=ALL-UNNAMED"
     # MBeanStatsGenerator
     OPTS="$OPTS --add-opens jdk.management/com.sun.management.internal=ALL-UNNAMED"
-    # LinuxInfoUtils
-    OPTS="$OPTS --add-opens java.base/jdk.internal.platform=ALL-UNNAMED"
 fi
 
 ZK_OPTS=" -Dzookeeper.4lw.commands.whitelist=* -Dzookeeper.snapshot.trust.empty=true -Dzookeeper.tcpKeepAlive=true"

pom.xml

@@ -1921,7 +1921,6 @@ flexible messaging model and an intuitive client API.</description>
           --add-opens java.base/java.io=ALL-UNNAMED <!--Bookkeeper NativeIO -->
           --add-opens java.management/sun.management=ALL-UNNAMED <!--JvmDefaultGCMetricsLogger & MBeanStatsGenerator-->
           --add-opens jdk.management/com.sun.management.internal=ALL-UNNAMED <!--MBeanStatsGenerator-->
-          --add-opens java.base/jdk.internal.platform=ALL-UNNAMED <!--LinuxInfoUtils-->
         </test.additional.args>
       </properties>
       <build>

pulsar-broker/src/main/java/org/apache/pulsar/broker/PulsarService.java

@@ -85,7 +85,6 @@
 import org.apache.pulsar.broker.intercept.BrokerInterceptor;
 import org.apache.pulsar.broker.intercept.BrokerInterceptors;
 import org.apache.pulsar.broker.loadbalance.LeaderElectionService;
-import org.apache.pulsar.broker.loadbalance.LinuxInfoUtils;
 import org.apache.pulsar.broker.loadbalance.LoadManager;
 import org.apache.pulsar.broker.loadbalance.LoadReportUpdaterTask;
 import org.apache.pulsar.broker.loadbalance.LoadResourceQuotaUpdaterTask;
@@ -662,14 +661,6 @@ public void start() throws PulsarServerException {
                         + "authenticationEnabled=true when authorization is enabled with authorizationEnabled=true.");
             }
 
-            if (!config.getLoadBalancerOverrideBrokerNicSpeedGbps().isPresent()
-                    && config.isLoadBalancerEnabled()
-                    && LinuxInfoUtils.isLinux()
-                    && !LinuxInfoUtils.checkHasNicSpeeds()) {
-                throw new IllegalStateException("Unable to read VM NIC speed. You must set "
-                        + "[loadBalancerOverrideBrokerNicSpeedGbps] to override it when load balancer is enabled.");
-            }
-
             localMetadataStore = createLocalMetadataStore();
             localMetadataStore.registerSessionListener(this::handleMetadataSessionEvent);