Notification rule(s) occasionally not sending email to all users in rule

Icinga 2
1

Hi Everyone,

This issue was recently brought to my attention, but I don’t know how/where to start troubleshooting. I have multiple notification rules where there are several users configured to get notifications. Occasionally, one of the users will, apparently, not get the expected notification. An example of an offending notification config is the following:

apply Notification "Service Notification - SQL - rRIS - Stored Procedures" to Service {
    import "mail-service-notification-html"

    interval = 5m
    assign where "sql-stored-procedures" in service.groups && service.name != "Check Time Processing Diagnostic Templates" && service.name != "Check CDC Latency" && service.name != "Check Long Running DB Sessions" && service.name != "Check Digital Form Issues" && service.name != "Check Long Running DB Sessions - RedGate Listener" && service.name != "Check rRis Action Queue Time - DD"
    states = [ Critical, OK, Warning ]
    types = [
        Acknowledgement,
        Custom,
        DowntimeEnd,
        DowntimeRemoved,
        DowntimeStart,
        Problem,
        Recovery
    ]
    users = [ "RIS Support INFO Alerts", "RadNet RIS Icinga Alerts" ]
}

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I currently don’t know how wide-spread the issue potentially is, but any help would be appreciated.