You should consider checking and updating your NMIS configuration to reflect these options, at least understand why you are not running the default (which may have changed in the last 15 years).
You can edit the configuration through the NMIS UI or with your favorite editor "vi /usr/local/nmis8/conf/Config.nmis"
Best Practice Configuration Options
nmis_summary_poll_cycle
There are some updates to improve UI and polling synchronisation. Check the following configuration option for nmis_summary_poll_cycle, it should be set to false and the summary update added to the crontab.
'nmis_summary_poll_cycle' => 'false',
The crontab should now include:
*/2 * * * * /usr/local/nmis8/bin/nmis.pl type=summary
global_nocollect_noDescription
This needs to be set to blank unless you intentionally want it to be "true".
'global_nocollect_noDescription' => '',
fastping_node_poll
We have found this is better set to a lower number, but if your experience has been otherwise, you do not need to change it.
'fastping_node_poll' => '200',