Reset health of Disk space alerts that have changed state from Warning to Critical.

Reset-LogicalDiskHealth.ps1

<#
.Synopsis
   Reset health of Disk space alerts that have changed state from Warning to Critical.
.DESCRIPTION
   This script is designed to be run as a scheduled task. It gets Logical Disk Free Low alerts that are critical and have a repeat count (indicating they have changed from warning to critical state), and resets the health of the monitor.
   This causes a new critical alert to be raised, which will trigger the notification subscription.
.NOTES
   Created by Lee Sartorelli 19/04/2016
#>


Import-module OperationsManager

# get new, critical alerts with a repeat count and specified name
$alerts =  get-scomalert -ResolutionState 0 -Severity 2| where {$_.RepeatCount -gt 0 -and $_.Name -like "Percentage Logical Disk Free Space is low"}


foreach($alert in $alerts) 

{
If ($alert) {
  # Get the Monitoring Object (e.g. Windows Computer Object)
  $MonObj = Get-SCOMMonitoringobject -Id $alert.MonitoringObjectId

  # If the monitor exist and is unhealthy
  If (($MonObj) -and ($MonObj.HealthState -ne "Success")) {
    # Get the monitor for the alert
    $Mon = Get-SCOMMonitor -Id $alert.MonitoringRuleId
    # Reset health of the monitor
    If ($Mon) {
      $MonObj.ResetMonitoringState($Mon)
      }
      }
      }
      }