Hello,
The most straight forward way to handle this would be to use the top command.
A couple of things to note. You'll want to wildcard your sourcetype so that you do indeed pickup the wineventlog sourcetypes (i.e. sourcetype="wineventlog:*"). In addition, you'll want to wrap the OR condition on the Type fields in parenthesis as such (Type="Critique" OR Type="Avertissement")
SPL...
index="wineventlog" sourcetype="wineventlog:*" SourceName="" (Type="Critique" OR Type="Avertissement")
| dedup _time SourceName
| top limit=10 SourceName
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