Zabbix Apache Monitoring Script (from https://www.zabbix.org/wiki/Docs/howto/apache_monitoring_script#Method_3, originally from https://www.zabbix.com/forum/showthread.php?p=62457)
zapache_patch.txt
If the polling time is close to the cache time it is possible for the cache to go stale between the first timestamp check and the second check.
zapache_patch.txt If the polling time is close to the cache time it is possible for the cache to go stale between the first timestamp check and the second check.
The attached patch should fix the problem.