Monitors per-disk SMART attributes on Synology NAS units via SNMP (SYNOLOGY-SMART-MIB), with configurable thresholds on the pre-failure counters. Includes the following checks: Per-disk SMART health: CRIT on any attribute with a status other than OK, except a resolved past failure, which stays OK by default and is always shown in the details. Pre-failure counters: reallocated, pending, offline uncorrectable, reported uncorrectable, and UDMA CRC, default WARN at 1 and CRIT at 10. Power-on hours, reported with a metric. One service per physical disk, named by drive bay including DX-series expansion enclosures, with device-path naming as a fallback. Version history: 1.1.0: resolved past failures no longer force CRIT, corrected drive bay naming on units with unordered tables or NVMe cache 1.0.1: author metadata update 1.0.0: initial release, per-disk SMART health, pre-failure counter thresholds with a dedicated ruleset, error counter and power-on hours metrics

Monitors Fortinet FortiSwitch hardware health over SNMP, beyond the usual interface, PoE and uptime coverage. Sensors are discovered per unit from the live sensor tables, so fanless, PSU-less and non-fiber models are handled correctly. Includes the following checks: CPU utilization Memory usage Chassis temperature PSU state Fan (state and speed) SFP optical diagnostics (RX/TX power, temperature, voltage, bias) Version history: 1.2.0: removed the duplicated word from PSU, fan and SFP service names 1.1.0: added SFP optical diagnostics (DOM) 1.0.1: hardened fan failure handling and discovery 1.0.0: initial release, CPU, memory, temperature, PSU and fan checks

Checkmk agent-based extension for monitoring Windows Server DHCPv4 failover relationships.

Monitors Linux hosts for pending system reboots. Detects whether a reboot is required, how long it has been pending, and which packages triggered it. Supports Debian, Ubuntu, RHEL, CentOS, Rocky Linux, AlmaLinux, Fedora and SUSE. Includes Agent Bakery support for automatic deployment. Based on https://exchange.checkmk.com/p/system-reboot-required

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

Monitors Dell PowerVault ME5 series storage systems through the controller HTTPS management API. State for every object comes from the array's own health and status values, and every check has a configurable ruleset. Validated on the Dell PowerVault ME5024 in multiple production Checkmk environments. Includes the following checks: System health and management-controller redundancy System performance: IOPS, throughput, and response time, each split into read and write, plus controller CPU and write cache use Health alerts: unresolved critical and warning alerts, with the affected component, reason, and the array's recommended action Controller health, failover, and cache policy Controller firmware Host ports: health, link status, speed, throughput, IOPS, response time, and queue depth Enclosures: health, status, and power draw, one service per enclosure Disk groups: RAID status, spares, and background jobs Storage pools: capacity via the built-in Filesystem ruleset, with trend and forecast Volumes: health, capacity, preferred-path ownership, throughput, IOPS, and cache hit ratios Physical disks: health, SMART status, SSD life, temperature, power-on hours, throughput, IOPS, queue depth, and predictive error counters (media errors, bad blocks, block reassignments, spin-up retries, I/O timeouts, no-response events) Power supplies Fans Temperature sensors, with state taken from the array's own per-sensor verdict and the built-in Temperature ruleset available for custom levels Supercapacitor packs: charge, capacitance, internal resistance, and cell voltages, one service per controller Voltage and current sensors Unwritable cache Snapshot protection: snapshot count, data, and newest snapshot age together with the schedule that creates them, with freshness and overdue alerting Connected hosts Version history: 1.2.2: fixed a false warning on the system health service where a healthy partner management controller was reported as not operational 1.2.0: added system performance, health alerts, enclosure, and supercapacitor checks, added volume and disk performance with cache hit ratios and predictive error counters, snapshot schedules are now reported with each volume's snapshots 1.1.0: added host port I/O statistics (throughput, IOPS, response time, and queue depth) to the host port check 1.0.0: initial release, system, controller, firmware, host port, disk group, pool, volume, disk, power supply, fan, temperature, sensor, unwritable cache, snapshot, and connected-host checks

Monitors the Infoblox Cloud Services Portal via its REST API: server and service health, DHCP high availability, anycast, DNS zones and IPAM utilization, and Threat Defense policies and feeds. Version history: 1.6.0: initial release

Original check by Allan GooD - allan.cassaro@gmail.com, originally packaged by Roger Ellenberger (WagnerAG). Original listing: https://exchange.checkmk.com/p/dfs-state Monitors DFS Replication (DFSR) state per replicated folder on Windows via the root\MicrosoftDFS WMI provider. One service per folder: Normal, Initializing, Initial Sync, Auto Recovery, or Error. Fixed: the bakery module used a removed API, so the deploy toggle silently produced no file. Migrated to register.bakery_plugin. Also fixed an item-detection bug where folder names with spaces failed to parse.

Original check by Kai Biebel, originally packaged by Roger Ellenberger (WagnerAG). Original listing: https://exchange.checkmk.com/p/dfs-backlog Monitors DFS Replication (DFSR) backlog per folder and partner on Windows via the root\MicrosoftDFS WMI provider. One service per folder/partner/direction, with configurable file-count thresholds. Fixed: the bakery module used a removed API, so the deploy toggle silently produced no file. Migrated to register.bakery_plugin. Also adds per-pairing error isolation, so a single unreachable partner doesn't blank the section.

Checkmk extension for monitoring DNS record drift and zone delegation by querying a domain's authoritative nameservers directly.