Thought I'd share this script I made
This script will compare the last update time of a chose RRA's and compare the values from the last check to see if they match if they don't this would indicate the RRA has not updated and there may be a problem
This script can also output to the cacti log so you can see this in the cacti UI as well
the code is available here https://github.com/bmfmancini/rrd-monitor.git
I am working on adding email alerts as well and also the ability to monitor multiple RRA's
Example output
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Example warning output
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