Checkmk SwissKnife

A Tampermonkey userscript that enhances the Checkmk 2.3.x web interface with quality-of-life improvements for WATO configuration and monitoring views.

Installation

1. Install the Tampermonkey browser extension.

2. Install the script from one of these sources:

   • GreasyFork (recommended)
   • Direct install

3. Tampermonkey will detect the @downloadURL and prompt for updates automatically.

Compatibility: Checkmk 2.3.x · Chrome · Firefox · Edge

Features

Feature	Description	Code function
Folder Path Search	Replaces the folder dropdown with a searchable overlay — type any path segment to filter instantly	initSelect2Enhanced
Accordion Badge Counts	Shows inline counters in each accordion header: enabled checkboxes (orange), inherited values (blue), differing values vs folder default (red)	initAccordionCheckedCounts
Ineffective Rule Highlight	Replaces the hard-to-spot hyphen icon on ineffective rules with a visible ⚠ badge and amber row border	highlightIneffectiveRules
Rule Match Status	Colors each rule row green (match) or dimmed (no match) when a ruleset is opened with host/service context	highlightRuleMatchStatus
Relevant Only Filter	Adds a "Relevant only" toggle above the rule list to hide all non-matching and non-highlighted rows	addRulesetFilterToggle
Extra Column — Host Actions	Inserts an Extra column in monitoring tables with per-host buttons: Service Discovery, copy FQDN, copy short hostname, copy IP	addInventoryButtons
Monitor Button in WATO Folder	Adds a green eye icon next to each active host in WATO folder listings to open its monitoring view in a new tab	addWatoFolderMonitorButtons
Configure in WATO Menu	Adds a host-selector dropdown and Open button to the monitoring view menu bar for bulk-opening hosts in WATO	addViewWatoMenu
Auto-check Foreign Changes	Automatically ticks the "Activate foreign changes" checkbox on the pending changes page	tryAutoCheckForeignActivation
Collapse All / Expand All	Adds two buttons to the menu bar to collapse or expand all accordion sections at once	addAccordionToggleButtons
Site Status Filters	Adds Disabled / Online / Timeout / Not running toggle buttons below "Add connection" to quickly filter the site connections list	addSitesFilterBar
ListChoice Filter Bar	Adds a search box, a "N / total selected" counter and a "Selected only" toggle above large checkbox lists (e.g. "Deploy custom files with agent")	addListChoiceFilter
Extra Column Toggle	Adds an ON/OFF button to the menu bar to show/hide the Extra column; the choice is remembered across reloads	addExtraColumnToggle
Copy Host List (JSON)	Adds a button to the menu bar that copies hostname, alias, IPv4 address and monitored site for every host in the list to the clipboard as JSON	addHostListCopyButton

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Folder Path Search

Replaces the default WATO folder dropdown with a searchable overlay. Type any segment of the folder path to filter — separators >, ›, and / are treated as equivalent.

Applies to: rule condition editor (explicit_conditions_p_folder_path) and monitoring view folder filter (wato_folder).

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Accordion Badge Counts

Displays inline counters in each accordion section header on host edit pages:

Badge	Meaning
orange (N)	N checkboxes enabled in this section
blue ↑N	N values inherited from a parent folder
red ≠N	N values that differ from the folder default (bulk edit only)

Applies to: edit_host, bulkedit, editfolder.

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Ineffective Rule Highlight

Replaces the low-visibility hyphen icon on ineffective rules with a prominent ⚠ ineffective badge and adds an amber left border to the row.

Applies to: mode=edit_ruleset.

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Rule Match Status Highlight

When a ruleset is opened in context (URL contains host= and/or service=), colors each rule row:

• Green + ✓ match — rule applies to the given host/service
• Dimmed + ✗ no match — rule does not apply

Applies to: mode=edit_ruleset with host/service context.

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Ruleset Filter Toggle

After match/ineffective highlighting runs, a "Relevant only" button appears above the rule list. Clicking it hides all ✗ no match rows, non-highlighted rows and empty folders, leaving only the matching (or ineffective) rules for the current context.

Applies to: mode=edit_ruleset (when at least one ✓ match or ineffective row exists).

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Extra Column with Host Actions

Adds a dedicated Extra column before the Host column in all monitoring view tables. Each row gets up to four icon buttons:

Button	Color	Action
Screen icon	Amber	Opens Service Discovery for the host in a new tab
Clipboard icon	Blue	Copies the full FQDN to clipboard
Clipboard icon	Purple	Copies the short hostname (first label) to clipboard
Clipboard icon	Green	Copies the host IP address to clipboard (shown only when available)

The IP address is read from the tooltip Checkmk places on the hostname cell. Clicking any clipboard button briefly turns it green to confirm the copy.

Hostnames longer than 32 characters are truncated with an ellipsis in the Host column; hover to see the full name in a tooltip. The copy buttons above always copy the full, untruncated hostname regardless of what's displayed.

Applies to: view.py host and service views.

An "Extra column: ON/OFF" button in the menu bar (next to "Configure in WATO", when present) lets you hide or show this column. The choice is saved in the browser's local storage, so it stays the same across reloads and on every monitoring view.

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Monitor Button on WATO Folder Pages

Adds a green eye icon next to each active (non-disabled) host in WATO folder listings, opening the host's monitoring view in a new tab. A summary badge on the section header shows monitored vs disabled host counts.

Applies to: wato.py?mode=folder.

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"Configure in WATO" Menu

Adds a Select hosts (N) dropdown and an Open button to the monitoring view menu bar. Select a page of hosts, then click Open — WATO opens in a new tab with exactly those hosts pre-filtered via regex search, ready for bulk configuration.

• Up to 50 hosts per page (keeps URLs within safe length limits)
• Deduplicates hostnames automatically (useful on service views where hosts repeat)
• Open button is disabled (gray) until a page is selected; turns blue when active; resets after opening
• Only visible for users with WATO configuration access

Applies to: view.py (admin/configuration role required).

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Auto-check "Activate Foreign Changes"

On the Activate pending changes page, automatically checks the Activate foreign changes checkbox as soon as the page is ready, so you never have to remember to tick it manually before activating.

Applies to: wato.py?mode=changelog (with or without sidebar).

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Collapse All / Expand All

Adds two buttons to the top menu bar on any page with expandable sections:

Button	Color	Action
Collapse All	Orange	Collapses all open accordion sections at once
Expand All	Green	Expands all collapsed accordion sections at once

Works on both host-edit pages (accordion sections are table.nform elements) and ruleset pages (accordion sections are div.foldable elements).

Applies to: edit_host, bulkedit, editfolder, edit_ruleset (with or without sidebar).

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Site Status Filters

Adds a row of quick filter buttons right below the Add connection shortcut on the Distributed Monitoring page:

Button	Color	Shows only sites where...
Disabled	Red	Status connection is Disabled
Online	Green	Status connection is Online
Timeout	Orange	Configuration connection reports a read timeout
Not running	Gray	Configuration connection reports "Site is not running"

Only one filter can be active at a time — clicking the active button turns it off and shows all sites again. The active filter is highlighted with a solid background so it's always clear which view you're in.

Applies to: wato.py?mode=sites (with or without sidebar).

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ListChoice Filter Bar

Checkmk's native checkbox-list widget (used by rules like "Deploy custom files with agent") renders one row per item with no grouping or pagination — some lists have 100+ entries even though a rule typically only needs 3-4 checked. Adds a search box, a live "N / total selected" counter, and a "Selected only" toggle above any such list with 15+ items. Purely visual — checkbox state and the Save button are unaffected.

Applies to: any WATO rule editor page containing a large checkbox-list value (with or without sidebar).

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Copy Host List (JSON)

Adds a "Copy host list (JSON)" button to the menu bar on any WATO host-list page — plain folder browsing or host search results. Clicking it copies hostname, alias, IPv4 address and monitored site for every host currently listed to the clipboard as a JSON array, ready to paste into a script, ticket, or spreadsheet.

Applies to: wato.py?mode=folder (folder browsing and host search results, with or without sidebar).

How it works

The script injects enhancements at page load and re-applies them on SPA navigation (Checkmk reloads content inside an <iframe> without a full page reload). Each feature is independent — a feature that does not apply to the current page does nothing and stops polling.

License

CC BY-NC 4.0 — free to use, share, and adapt for non-commercial purposes. Commercial use or resale is not permitted.