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vi Thread_Count.sh

#!/bin/bash

OUTPUT_FILE="threadCount"

# It continues every 10 seconds for a total of 5 minutes.
INTERVAL=10 
DURATION=300 
END_TIME=$((SECONDS + DURATION))

# Clear or create previous file
echo "" > $OUTPUT_FILE

# Start loop for each namespace
while [ $SECONDS -lt $END_TIME ]; do
  for NAMESPACE in "${@}"; do
    echo "Processing namespace: $NAMESPACE at $(date)" >> $OUTPUT_FILE

    # List all pods in namespace
    pods=$(kubectl get pods -n $NAMESPACE -o jsonpath='{.items[*].metadata.name}')

    # Start loop for each pod
    for pod in $pods; do
      echo "  Processing pod: $pod" >> $OUTPUT_FILE

      # Get the number of threads in the pod
      thread_count=$(kubectl exec -n $NAMESPACE $pod -- ps -eo nlwp | tail -n +2 | awk '{ num_threads += $1 } END { print num_threads }' 2>/dev/null)

      # If thread count is not available, mark it as 'N/A'
      if [ -z "$thread_count" ]; then
        thread_count="N/A"
      fi

      # Write results to file
      echo "$NAMESPACE/$pod: $thread_count" >> $OUTPUT_FILE
    done
  done

  # Wait for INTERVAL time
  sleep $INTERVAL
done

echo "Thread counts have been written to $OUTPUT_FILE."

sudo chmod +x Thread_Count.sh
If you want to use it manually, you can run it with the following command. 
./Thread_Count.sh <Namespace1> <Namespace2> <Namespace3>
If you wish, you can ensure the script runs at a specific time or time period. Cron can be used for this. 
sudo crontab -e
Add the line below to the opened file. In example usage, the script will run every 5 minutes. 
*/5 * * * * /path/Thread_Count.sh namespace1 namespace2 namespace3