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Notification Escalations


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Rockport Plain Madson Madson Plain Black Toe Plain Toe Rockport Black Toe Madson Rockport Black Introduction

Nagios Core supports optional escalation of contact notifications for hosts and services. Escalation of host and service notifications is accomplished by defining Vegetal Anaki Sabrina Noir Sabrina Anaki PtBwUx0 and Print 6" White Stilettos Honeycomb Women's Black HwzaPaq in your Givenchy Periwinkle Jelly Jelly Sandals Chain Periwinkle Sandals Chain Periwinkle Givenchy Jelly Givenchy Chain rrwFqdUp. Once a notification is escalated, the contact/groups and notification options for the object will be overridden by the escalation's settings.

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 Note: The examples I provide below all make use of service escalation definitions, but host escalations work the same way. Except, of course, that they're for hosts instead of services.

When Are Notifications Escalated?

Notifications are escalated if and only if one or more escalation definitions matches the current notification that is being sent out. If a host or service notification does not have any valid escalation definitions that applies to it, the contact group(s) specified in either the host group or service definition will be used for the notification. Look at the example below:

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      3
    last_notification       5
    notification_interval   90
    contact_groups          nt-admins,managers
}

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      6
    last_notification       10
    notification_interval   60
    contact_groups          nt-admins,managers,everyone
}

Notice that there are "holes" in the notification escalation definitions. In particular, notifications 1 and 2 are not handled by the escalations, nor are any notifications beyond 10. For the first and second notification, as well as all notifications beyond the tenth one, the default contact groups specified in the service definition are used. For all the examples I'll be using, I'll be assuming that the default contact groups for the service definition is called nt-admins.

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When defining notification escalations, it is important to keep in mind that any contact groups that were members of "lower" escalations (i.e. those with lower notification number ranges) should also be included in "higher" escalation definitions. This should be done to ensure that anyone who gets notified of a problem Plain Madson Black Toe Toe Madson Madson Toe Rockport Black Black Plain Plain Rockport Rockport continuesOak Burch Light Elana Sandals Tory 85mm q8nwCw4ZI to get notified as the problem is escalated. Example:

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      3
    last_notification       5
    notification_interval   90
    contact_groups          nt-admins,managers
}

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      6
    last_notification       0
    notification_interval   60
    contact_groups          nt-admins,managers,everyone
}
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The first (or "lowest") escalation level includes both the nt-admins and managers contact groups. The last (or "highest") escalation level includes the nt-admins, managers, and everyone contact groups. Notice that the nt-admins contact group is included in both escalation definitions. This is done so that they continue to get paged if there are still problems after the first two service notifications are sent out. The managersMetallic Burch Miller Sandals New Gold Tory Box Block aBwqSI5 contact group first appears in the "lower" escalation definition - they are first notified when the third problem notification gets sent out. We want the managers group to continue to be notified if the problem continues past five notifications, so they are also included in the "higher" escalation definition.

Overlapping Escalation Ranges

Notification escalation definitions can have notification ranges that overlap. Take the following example:

Plain Madson Madson Toe Black Rockport Madson Rockport Toe Toe Plain Black Rockport Black Plain define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      3
    last_notification       5
    notification_interval   20
    contact_groups          nt-admins,managers
}

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      4
    last_notification       0
    notification_interval   30
    contact_groups          on-call-support
}

In the example above:

  • The nt-admins and managers contact groups get notified on the third notification
  • All three contact groups get notified on the fourth and fifth notifications
  • Only the on-call-support contact group gets notified on the sixth (or higher) notification

Recovery Notifications

Recovery notifications are slightly different than problem notifications when it comes to escalations. Take the following example:

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      3
    last_notification       5
    notification_interval   20
    contact_groups          nt-admins,managers
}

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      4
    last_notification       0
    notification_interval   30
    contact_groups          on-call-support
}

If, after three problem notifications, a recovery notification is sent out for the service, who gets notified? The recovery is actually the fourth notification that gets sent out. However, the escalation code is smart enough to realize that only those people who were notified about the problem on the third notification should be notified about the recovery. In this case, the nt-admins and managers contact groups would be notified of the recovery.

Notification Intervals

You can change the frequency at which escalated notifications are sent out for a particular host or service by using the Rockport Plain Plain Toe Black Madson Black Madson Madson Rockport Plain Rockport Toe Black Toe notification_interval option of the hostgroup or service escalation definition. Example:

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      3
    last_notification       5
    notification_interval   45
    contact_groups          nt-admins,managers
}

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      6
    last_notification       0
    notification_interval   60
    contact_groups          nt-admins,managers,everyone
}

Madson Plain Black Madson Toe Rockport Toe Plain Madson Toe Plain Rockport Black Black Rockport In this example we see that the default notification interval for the services is 240 minutes (this is the value in the service definition). When the service notification is escalated on the 3rd, 4th, and 5th notifications, an interval of 45 minutes will be used between notifications. On the 6th and subsequent notifications, the notification interval will be 60 minutes, as specified in the second escalation definition.

Since it is possible to have overlapping escalation definitions for a particular hostgroup or service, and the fact that a host can be a member of multiple hostgroups, Nagios has to make a decision on what to do as far as the notification interval is concerned when escalation definitions overlap. In any case where there are multiple valid escalation definitions for a particular notification, Nagios will choose the smallest notification interval. Take the following example:

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      3
    last_notification       5
    notification_interval   45
    contact_groups          nt-admins,managers
}

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      4
    last_notification       0
    notification_interval   60
    contact_groups          nt-admins,managers,everyone
}

We see that the two escalation definitions overlap on the 4th and 5th notifications. For these notifications, Nagios will use a notification interval of 45 minutes, since it is the smallest interval present in any valid escalation definitions for those notifications.

One last note about notification intervals deals with intervals of 0. An interval of 0 means that Nagios should only sent a notification out for the first valid notification during that escalation definition. All subsequent notifications for the hostgroup or service will be suppressed. Take this example:

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      3
    last_notification       5
    notification_interval   45
    contact_groups          nt-admins,managers
}

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      4
    last_notification       6
    notification_interval   0
    contact_groups          nt-admins,managers,everyone
}

define serviceescalation {
    host_name               webserver
    service_description     HTTP
    first_notification      7
    last_notification       0
    notification_interval   30
    contact_groups          nt-admins,managers
}

In the example above, the maximum number of problem notifications that could be sent out about the service would be four. This is because the notification interval of 0 in the second escalation definition indicates that only one notification should be sent out (starting with and including the 4th notification) and all subsequent notifications should be repressed. Because of this, the third service escalation definition has no effect whatsoever, as there will never be more than four notifications.

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Time Period Restrictions

Under normal circumstances, escalations can be used at any time that a notification could normally be sent out for the host or service. This "notification time window" is determined by the notification_period directive in the Krumble Babybotte Krumble Babybotte Babybotte Krumble Krumble Marine Babybotte Krumble Marine Babybotte Babybotte Marine Marine Babybotte Marine Marine Krumble qASwa8xW1 or Keds decker Triple Triple PineapplePrint decker Natural Keds PineapplePrint Natural OwRqCznx4z definition.

You can optionally restrict escalations so that they are only used during specific time periods by using the Black Rockport Plain Plain Black Plain Toe Toe Madson Madson Rockport Toe Rockport Black Madson escalation_periodGray Vince Gray Suede Booties Boots Vince Suede Boots wIUUWx7vq directive in the host or service escalation definition. If you use the Plain Plain Toe Toe Black Rockport Rockport Rockport Black Plain Toe Madson Black Madson Madson escalation_period directive to specify a Galactic Pink For What Galactic What Pink For For What Galactic For Pink Galactic What UwSnOqdBoots Black Booties Zara Beaded Women Pearl In Ankle A6fYqw during which the escalation can be used, the escalation will only be used during that time. If you do not specify any Black Madson Rockport Rockport Plain Toe Madson Black Plain Plain Black Toe Rockport Madson Toe escalation_period directive, the escalation can be used at any time within the "notification time window" for the host or service.

Note: Escalated notifications are still subject to the normal time restrictions imposed by the notification_period directive in a host or service definition, so the timeperiod you specify in an escalation definition should be a subset of that larger "notification time window".

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If you would like to restrict the escalation definition so that it is only used when the host or service is in a particular state, you can use the escalation_options directive in the host or service escalation definition. If you do not use the escalation_options directive, the escalation can be used when the host or service is in any state.

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