Monitors the VMware vCenter Server Appliance (VCSA) itself via its REST management API. State comes from the appliance's own reported values, with configurable thresholds throughout.

Includes the following checks:

• vMon service state: CRIT on any automatic service not running or reporting degraded health
• Appliance health areas: appliance-reported color per area
• CPU and memory: utilization, CPU steal, and swap page rate
• Filesystems: per-partition usage
• Certificates: machine TLS, signing, and trusted root, each with expiry thresholds and a hostname match check
• Root password: expiry thresholds
• Time synchronization: NTP reachability
• Update status: available updates by severity, plus repository check staleness
• Also covers network interfaces, DNS, access settings, proxy, syslog forwarding, pending shutdown, backup status, and database usage

Version history:

• 1.1.3: the update check now uses the appliance's pending update list rather than its status field, which could report the appliance as up to date while updates were available, and reports each update with severity, type, release date and reboot requirement; where the monitoring account cannot read the pending list, the check falls back to the status field and notes the limitation rather than reporting unknown; credential resolution now prefers the dedicated password store API on Checkmk 2.5 and later
• 1.1.1: halves monitoring API requests, fixes a false alert on DNS collection failure and a duplicated line in the database usage summary
• 1.1.0: adds CPU steal, memory bytes, swap page rate, access/proxy/syslog/shutdown/database checks, and a certificate hostname match, corrects filesystem percentage source, revises root password and update-staleness defaults, credentials now resolved via the password store
• 1.0.0: initial release, vMon service states, appliance health areas, resource and filesystem usage, update status, backup status, certificates, root password expiry, time synchronization, network interfaces and DNS