Alert impact calculation Impact calculation shows the magnitude of an outage on CIs, services, alerts, and alert groups. As an alert generates, factors such as impact rules and CI relationships are used to calculate the severity. The alert severity is then displayed on the impact tree, business service or manual service maps, and dashboards. Impact calculations are available for business services, manual services, and alert groups. The following factors are used to calculate the overall impact of an outage. Impact rules. Number of related active alerts. Past history of the affected CI. Relationships between CIs for a particular business service or manual service. If the CI element includes a network or storage devices. If the CI is in maintenance. CIs in maintenance, alerts on the CI are excluded from impact calculation.Note: Starting with the Helsinki release, CIs are considered to be in maintenance not only when an active change request is scheduled, but also when the Status field of the CI is set to In Maintenance. In both cases, the CI is excluded from impact calculation and alerts for the CI do not appear in the Alert console.Note: When a child CI is put in maintenance, it also puts the parent CI in maintenance. If there is a connection between services, the impact of one service on the other is also calculated. Figure 1. Impact calculations use information from various sources to set the alert severity How impact is calculatedImpact calculation varies depending on the CI relationships for a business service or manual service. Additional factors, such as change requests, network paths, storage paths, and related CIs, all affect impact calculation.Configure basic settings for impact calculationIn addition to configuring impact rules, you can configure properties for impact calculation. Impact rulesImpact rules, which are used for impact calculation, estimate the magnitude or severity of an outage based on affected CIs.Adjust impact rules for a CIConfigure impact rules to customize the impact calculation. The impact rules update the overall alert and show the impact on related CIs. When you change impact rules, the updates apply to alert severity in places such as the Event Management alerts console and dashboard. Create an infrastructure relationship for related CIsInfrastructure relationships show CIs that are connected to a business service but are not necessary parts of the service. Infrastructure relationships are only available for business services.