On a Linux box - If you would like to see a metric with percentage memory and swap used, it's as simple as adding another 4 lines to the vm.sh file in /opt/circonus/etc/node-agent.d/linux

Below is the default vm.sh file with the following additions:

    

  1. 
let MEM_PERC=100*$MEM_USED/$MEM_TOTAL

    2. 

  2. 
let SWAP_PERC=100*${SWAP[2]}/${SWAP[1]}

    3.

and then 2 print statements:

    

  1. print_vm memory perc $MEM_PERC
    2. 

  2. print_vm swap perc $SWAP_PERC
    3. 

    

  1. #!/bin/bash
    2. 

  2. 
print_vm() {

    3. 

  3. 
    printf "%s`%s\tL\t%s\n" $1 $2 $3

    4. 

  4. }
    5. 

  5. 
MEM=($(free -b | grep ^Mem:))

    6. 

  6. 
MEM_TOTAL=${MEM[1]}

    7. 

  7. # For consistency across platforms, count cache as free, not used
    8. 

  8. 
let MEM_USED=${MEM[1]}-${MEM[3]}-${MEM[5]}-${MEM[6]}

    9. 

  9. 
let MEM_FREE=${MEM[3]}+${MEM[5]}+${MEM[6]}

    10. 

  10. 
let MEM_PERC=100*$MEM_USED/$MEM_TOTAL

    11. 

  11. 
SWAP=($(free -b | grep ^Swap:))

    12. 

  12. 
SWAP_TOTAL=${SWAP[1]}

    13. 

  13. 
SWAP_USED=${SWAP[2]}

    14. 

  14. 
SWAP_FREE=${SWAP[3]}

    15. 

  15. 
let SWAP_PERC=100*${SWAP[2]}/${SWAP[1]}

    16. 

  16. # pgfault is min+maj
    17. 

  17. 
PG_FAULTS=$(grep ^pgfault /proc/vmstat | awk '{ print $2 }')

    18. 

  18. 
PG_MAJFAULTS=$(grep ^pgmajfault /proc/vmstat | awk '{ print $2 }')

    19. 

  19. 
let PG_MINFAULTS=$PG_FAULTS-$PG_MAJFAULTS

    20. 

  20. print_vm memory total $MEM_TOTAL
    21. 

  21. print_vm memory used $MEM_USED
    22. 

  22. print_vm memory free $MEM_FREE
    23. 

  23. print_vm memory perc $MEM_PERC
    24. 

  24. print_vm swap total $SWAP_TOTAL
    25. 

  25. print_vm swap used $SWAP_USED
    26. 

  26. print_vm swap free $SWAP_FREE
    27. 

  27. print_vm swap perc $SWAP_PERC
    28. 

  28. print_vm info page_fault $PG_FAULTS
    29. 

  29. 
print_vm info page_fault`minor $PG_MINFAULTS

    30. 

  30. 
print_vm info page_fault`major $PG_MAJFAULTS

    31.

Just remember to restart nad (sudo /etc/init.d/nad restart), then go to the existing check and enable the 2 new metrics!

You can also change the 100 to 10,000 above, turning the resulting %age into a 4 digit number, then apply =VAL/100 to the metric in the graph to get XX.XX% for more precision.