Hi @Vrakking ,
By default, each Runbook Server is configured to simultaneously run a maximum of 50 runbooks, it appears that you have modified this value, which is OK as long as the server performance allows it.
You might be receiving this event because one of your runook server's runbook usage percentage is "yellow", the 86.50% one.
This is mainly just a warning, nothing to be worried about.
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Best regards,
Leon