Kill monitoring scripts by process group to ensure a full shutdown

net/net.sh

@@ -450,7 +450,11 @@ stopNode() {
         sudo snap set solana mode=
       fi
       ! tmux list-sessions || tmux kill-session
-      for pattern in solana- remote- oom-monitor net-stats; do
+      for pid in solana/{net-stats,oom-monitor}.pid; do
+        pgid=\$(ps opgid= \$(cat \$pid) | tr -d '[:space:]')
+        sudo kill -- -\$pgid
+      done
+      for pattern in solana- remote-; do
         pkill -9 \$pattern
       done
     "

net/remote/remote-node.sh

@@ -139,7 +139,9 @@ local|tar)
   (
     sudo scripts/oom-monitor.sh
   ) > oom-monitor.log 2>&1 &
+  echo $! > oom-monitor.pid
   scripts/net-stats.sh  > net-stats.log 2>&1 &
+  echo $! > net-stats.pid
 
   maybeNoLeaderRotation=
   if ! $leaderRotation; then