Add open file descriptor monitoring (#5655)

net/net.sh

@@ -752,7 +752,7 @@ stopNode() {
       PS4=\"$PS4\"
       set -x
       ! tmux list-sessions || tmux kill-session
-      for pid in solana/{net-stats,oom-monitor}.pid; do
+      for pid in solana/{net-stats,fd-monitor,oom-monitor}.pid; do
         pgid=\$(ps opgid= \$(cat \$pid) | tr -d '[:space:]')
         if [[ -n \$pgid ]]; then
           sudo kill -- -\$pgid

net/remote/remote-client.sh

@@ -50,9 +50,13 @@ skip)
 esac
 
 (
-  sudo scripts/oom-monitor.sh
+  sudo SOLANA_METRICS_CONFIG="$SOLANA_METRICS_CONFIG" scripts/oom-monitor.sh
 ) > oom-monitor.log 2>&1 &
+echo $! > oom-monitor.pid
+scripts/fd-monitor.sh > fd-monitor.log 2>&1 &
+echo $! > fd-monitor.pid
 scripts/net-stats.sh  > net-stats.log 2>&1 &
+echo $! > net-stats.pid
 
 ! tmux list-sessions || tmux kill-session
 

net/remote/remote-node.sh

@@ -93,6 +93,8 @@ local|tar|skip)
     sudo SOLANA_METRICS_CONFIG="$SOLANA_METRICS_CONFIG" scripts/oom-monitor.sh
   ) > oom-monitor.log 2>&1 &
   echo $! > oom-monitor.pid
+  scripts/fd-monitor.sh > fd-monitor.log 2>&1 &
+  echo $! > fd-monitor.pid
   scripts/net-stats.sh  > net-stats.log 2>&1 &
   echo $! > net-stats.pid