Nagios Support Forum

Understand that using nagios plugins to pull memory and disk usage (EBS volumes)
for EC2 instances will result in incorrect data
eg all my ec2 servers show 100% memory use all the time.

can someone help me understand this limitation? Is there some doc w/
clear explanation as to why this happens only on ec2 instances?

I understand that using cloudwatch agents does pull the correct metrics.

Please clarify which checks are failing by providing a screenshot of the output as well as configuration. I'm not aware(and after doing a quick check with colleagues) of behavior like you're describing.