Crond from standalone NG webservers is spamming with messages like shown below:
/usr/bin/gmetric: No such file or directory
on OA greater than 5.5.5.
The following strings can be found in the crontab files on the webservers:
$ cat /etc/cron.d/dynrequestsstat * * * * * root /usr/sbin/dynrequestsstat
Since OA 5.5.5 calls of dynrequests script are added to crontab on NG web servers, but this script should be added only for NG Webcluster because Ganglia is installed only on Cluster and not installed on standalone NG web server.
The issue has been fixed in OA 5.5 update 8.
Since it is not actually necessary to install the Ganglia packages on standalone NG web servers, you can just remove
/etc/cron.d/dynrequestsstat file from the server to get rid of the messages.