Hello
@grayloglearn,
No, the plugin output codes to indicate status haven't changed are quite simple. However, for agents I would recommend keeping them current or at the same version. For example, for major or minor upgrades of NRPE, then upgrade the check_nrpe plugin on the Nagios Server as well. However, keeping your Nagios XI server update to date will be sufficient.
See:
NRPE - v3 Compatibility With Previous VersionsLet me know if that answers your question or not.
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