Issue with DST and passive checks

[MrPippin66]

Nagios Core = 4.4.11

We had a rash of passive check alerts this weekend after DST kicked in.

We have passive checks configured to alert if checks not received in 1 hour.

Passive checks are received every 5 minutes, and logs confirm passive checks have been received up to this point in that interval.

Example service check definition:

define service {

    use                     local-service           ; Name of service template to use
    hostgroup_name             ftw-vmware-datacenter
    servicegroups vmware_base_os
    service_description     DATASTORE@SNW-INTEL Admin-IGS
    check_command check_dummy!1!'Passive check results not receieved within threshold. Queue incident to Nagios'
    check_freshness                 1
    freshness_threshold             3600
    active_checks_enabled           0
    passive_checks_enabled          1
    max_check_attempts              1                     ; Check each Windows host 2 times (max)
    passive_checks_enabled 1

}

Below is a warning example from log:

Sun Nov 3 01:51:11 CST 2024 Warning: The results of service 'DATASTORE@SNW-INTEL Admin-IGS' on host 'FORTWORTH-DC' are stale by 0d 0h 0m 37s (threshold=0d 1h 0m 0s). I'm forcing an immediate check of the service.

Note the stale time is only 37s.

[aaronagios]

Thanks for the report. There may be some DST issue, #945. We'll take a look.