Nagios check_esxi_hardware CRITICAL: Execution time too long!

Today I ran into a Nagios check that had shown status “UNKNOWN” with output “CRITICAL: Execution time too long!” for the check_esxi_hardware check. The server and ESXi system all seemed to be functioning just fine, and no updates had been applied between it working and the new “UNKNOWN” status.

It turns out this check directly depends on the CIM service, which had somehow gotten into a “stopped” state. After restarting the CIM service in ESXi (Configuration tab -> Software -> Security Profile -> Services properties), checks started giving proper results and stats again.

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