historical windows uptime calculator (#300)

custom powershell script to track historical uptime of windows per 24 hour period.

Co-authored-by: Cristian Ciutea <cristi.ciutea@gmail.com>

examples/windows/GetUpTimeFromSystemLogPastDay.ps1

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+[timespan]$downTime = New-TimeSpan -start 0 -end 0
+[timespan]$totalDownTime = New-TimeSpan -start 0 -end 0
+Get-EventLog -LogName system | 
+Where-Object `
+{ $_.eventid -eq 6005 -OR $_.eventID -eq 6006 -AND $_.timegenerated -gt (get-date).adddays(-1) } | 
+Sort-Object -Property timegenerated |
+Foreach-Object `
+{
+  if ($_.EventID -eq 6006)
+     { 
+       $down = $_.TimeGenerated
+     } #end if eventID
+  Else
+     { 
+      $up = $_.TimeGenerated 
+     } #end else
+   if($down -AND $up)
+     {
+      if($down -ge $up) 
+         { 
+           Write-Host -foregroundColor Red "*** Invalid data. Ignoring $($up)"
+           $up = $down 
+          } #end if down is greater than up
+       [timespan]$CurrentDownTime = new-TimeSpan -start $down -end $up
+       [timeSpan]$TotalDownTime = $currentDownTime + $TotalDownTime
+       $down = $up = $null
+     } #end if down and up
+} #end foreach
+#"Total down time on $env:computername is:"
+#$TotaldownTime
+$minutesInMonth = (24*60)*30
+$minutesInDay = 24*60
+$downTimeMinutes = $TotaldownTime.TotalMinutes
+$percentUpTime = "{0:n2}" -f (100 - ($downTimeMinutes/$minutesInDay)*100)
+"{
+    ""UptimePercent1Day"":  $percentUptime
+}"

examples/windows/windows-historical-uptime.yml

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+integrations:
+  - name: nri-flex
+    config:
+      name: WindowsUptime
+      apis:
+        - event_type: systemUptime
+          shell: powershell
+          commands:
+            - run: "C:/Program` Files/New` Relic/newrelic-infra/integrations.d/GetUpTimeFromSystemLogPastDay.ps1"
+              timeout: 29000