get-winevent -listlog osi*

LogMode   MaximumSizeInBytes RecordCount LogName
-------   ------------------ ----------- -------
Circular             1052672           2 OSIsoft-PIDataServices/Admin
Circular             1052672          65 OSIsoft-PIDataServices/Operational
Circular             1052672         136 OSIsoft-PISystemSearch/Admin
Circular             1052672        2192 OSIsoft-PISystemSearch/Operational
Circular             1052672          57 OSIsoft-PIVisualization/Admin
Circular             1052672          66 OSIsoft-PIVisualization/Operational
Circular             1052672           2 OSIsoft-Search/Admin

get-eventlog -logname "PIWebAPI%4Admin"
get-eventlog : The event log 'PIWebAPI%4Admin' on computer '.' does not exist.
At line:1 char:1
+ get-eventlog -logname "PIWebAPI%4Admin"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Get-EventLog], InvalidOperationException
+ FullyQualifiedErrorId : System.InvalidOperationException,Microsoft.PowerShell.Commands.GetEventLogCommand