Creates or updates machines in bulk. Identity is determined by FQDN computed as computerName or computerName.domainName.
When a machine already exists, only provided fields that differ from current values are applied; unspecified fields are left unchanged.

Note: If the ControlUp environment has the agent setting 'Deploy agents automatically (from monitor only)' enabled in the configuration console, adding a new machine (with isOutboundReady = false) via this endpoint will cause the ControlUp Monitor to attempt agent deployment to that machine automatically. This process runs from the Monitor service and requires valid domain credentials configured for the Monitor with local administrator rights on the target machines and necessary network/prerequisite access.