checkMX is a Perl daemon which monitors remote MX servers for a domain's overall health. If all the MX hosts are down and the domain can no longer receive mail, checkMX updates the Postfix relay_domains file so it will start accepting mail for the broken domain. Once the domain can start accepting mail on its own, checkmx will flush the mail queue for delivery and remove it from postfix relay_domains file. This prevents spammers from using the backup MX server as a spam vector.
check_aaccli is a plugin for Nagios which checks the hardware health of Adaptec SCSI RAID controllers. To accomplish this, you must have installed the aaccli binary (from the aacapps package). The plugin checks the error log of single disks (with S.M.A.R.T.) and the health of mirror containers.
check_db2_health is a plugin for Nagios that allows you to monitor DB2 database servers. Itcan operate in several modes: measuring how long it takes to connect and log in; display the number of connected users; display percentage of synchronous reads (SRP); display the percentage of asynchronous writes; display hit ratio in Buffer Pools, or only in Data Pages or Index Pages; display the percentage of SELECT that use an index; display the number of deadlocks per second; display the number of lock requests per second that could not be satisfied; display the fraction of time which was spent waiting for locks; display used space in a database or tablespace; display free space in a tablespace (in contrast to the previous mode, you can use units (MB, GB) for the thresholds); or display used space in a database log.
check_dnssec is a set of Nagios plugins to monitor DNSSEC services/zones. check_dnssec is based on ldns, a low-level DNS(SEC) library. check_dnssec_expiration checks if a domain is signed and the signature is not exited or expiring soon. check_dnssec_trace checks if a domain can trust traces from a domain with a trust-anchor. check_dnssec_trust_anchor checks if all trust anchors in a file are valid.
check_hpasm is a plugin for Nagios which checks the hardware health of Hewlett-Packard Proliant servers. To accomplish this, you must have installed the hpasm package. The plugin checks the health of processors, power supplies, memory modules, fans, CPU- and board-temperatures, and alerts you if one of these components is faulty or operates outside its normal parameters.
check_mssql_health is a plugin for Nagios that allows you to monitor an MS SQL Server. Among the list of metrics are time to login, buffer cache hit rate, page life expectancy, full table scan rate, free space in databases, batch requests/second, and many more. Installation of the DBD::Sybase Perl module is required.