
Mattias Schlenker enhanced the Checkmk/checkmk-docs repository by delivering robust documentation, localization, and release management improvements over twelve months. He engineered macro-driven versioning, streamlined onboarding guides, and introduced cross-language consistency, using Python and AsciiDoc to automate and standardize content updates. His work included developing tools for commit history comparison, refining plugin and integration documentation, and implementing preprocessor macros for SaaS differentiation. By focusing on automation, technical writing, and configuration management, Mattias reduced onboarding friction, improved release hygiene, and ensured maintainable, accurate documentation. His contributions addressed both user-facing clarity and internal maintainability, supporting scalable, multi-language documentation workflows.

October 2025 (2025-10) monthly summary for Checkmk docs. Delivered three major documentation features with associated quality improvements: Grafana integration documentation improvements, documentation versioning and release notes updates, and Quality Weeks documentation enhancements with UI improvements. Impact: clearer integration guidance, safer upgrades due to improved versioning guidance, and a richer, more actionable quality weeks docs experience across code blocks, collapsibles, and media. Minor defects addressed were limited to typos and copybutton-related polish; no critical customer-facing bugs reported. Technologies/skills demonstrated include documentation engineering, Markdown/docs tooling, versioning strategies, UI pattern implementations (collapsibles, lightbox, tabbed code blocks, copybutton), and cross-repo collaboration.
October 2025 (2025-10) monthly summary for Checkmk docs. Delivered three major documentation features with associated quality improvements: Grafana integration documentation improvements, documentation versioning and release notes updates, and Quality Weeks documentation enhancements with UI improvements. Impact: clearer integration guidance, safer upgrades due to improved versioning guidance, and a richer, more actionable quality weeks docs experience across code blocks, collapsibles, and media. Minor defects addressed were limited to typos and copybutton-related polish; no critical customer-facing bugs reported. Technologies/skills demonstrated include documentation engineering, Markdown/docs tooling, versioning strategies, UI pattern implementations (collapsibles, lightbox, tabbed code blocks, copybutton), and cross-repo collaboration.
September 2025 (2025-09) focused on improving documentation quality, tooling, and release hygiene for Checkmk/checkmk-docs. Key outcomes include: enhanced guidance across CLI usage, configuration file handling, Python plugin behavior, Grafana plugin installation, and related tooling, plus removal of outdated dev guidelines; introduction of a Ruby-based commit history comparison tool to surface missing commits and changed files between master and a target pick branch; and a patch release bump to 2.4.0p11 with updated version metadata. Overall, these efforts improve developer onboarding, release reliability, and traceability of changes.
September 2025 (2025-09) focused on improving documentation quality, tooling, and release hygiene for Checkmk/checkmk-docs. Key outcomes include: enhanced guidance across CLI usage, configuration file handling, Python plugin behavior, Grafana plugin installation, and related tooling, plus removal of outdated dev guidelines; introduction of a Ruby-based commit history comparison tool to surface missing commits and changed files between master and a target pick branch; and a patch release bump to 2.4.0p11 with updated version metadata. Overall, these efforts improve developer onboarding, release reliability, and traceability of changes.
Month: 2025-08 — Checkmk/checkmk-docs Documentation Localization and UI Guidance Improvements Key features delivered: - Keyboard Macros Enhancement: added examples to improve macro support (KNW-1414). Commits: 788b03a1442400ec801057576a459c9690d677c0; 85d85d887082e349c57ec095f4a2de601c2bbb5. - DeepL Translation Fixes and GUI Hints (KNW-1902): fixed table for DeepL translation; added missing GUI hints across translations. Commits: bc71f8300bc9e3ba2b318d4b0693561ecf7c8610; d254e85b5a700eae20596f9225efec88b72c9698; eee5f86f6f3eabd86e61dc238c5f308b7801589c; 4a3d761458e26e3bc52448d667663a287c01fad4. - Admonitions added to surface differences and multiple data points (KNW-1904, KNW-1905): added admonition indicating differences between article and current state; added admonition hinting on multiple data points. Commits: cfe3968bd3a4d45b7a47b048bbdeb8fefad75dcd; 9c4a25af24080126ab1ac41d4b1ba25cb7fc07fd. - Localization and content clarity improvements: Notranslate spans for English-only content (KNW-190? Notranslate) Commits: 6d32bd3817f2f02b113b58edba6c569987fa3056; Localization sync: Only-De in Sync with Rest (10419142); Remove hint to old package (KNW-1898); Version bump (KNW-734, 10419142, etc). Commits: 6d32bd3817f2f02b113b58edba6c569987fa3056; 1041914254bdaa698a41311695c75eabbbd80758; 43a40b3e9e01686630dc3c3ca62f5277af6fe99a; a7adeba641901a3572a441460fc2bfe30a57d62d; (note: individual commits referenced inline) - Release readiness and platform alignment: Release 2.4.0 version bump; KNW-1905 development updates up to 2.4.0p10 including texts/images/review readiness; browser keycodes and keysyms clarifications; experimental feature addition. Commits: fb2dd920128ce4f5dd939395fae7897001d102a2; 147af8be9f299c2c318cbeb5d6cea68209a7bd68; 3ad4b91fa64ab1d412730cdf6b09b9c4d6b6bbd2; 02fd6f0e6a7eb828480c9daccbd9240bef03c091; bfc2059bb461b93a60195e5bb77126b6729b630b; e48a33b83c6ccd4441fae587b1456913c3b524cb; f8794aebcc0c097754f79376f14842e790c09f3e; fae44b290713f7d71fb0393f1aaa6daac6819499. Major bugs fixed: - DeepL translation: fixed table and added GUI hints across translations (KNW-1902). Commits: bc71f8300bc9e3ba2b318d4b0693561ecf7c8610; d254e85b5a700eae20596f9225efec88b72c9698; eee5f86f6f3eabd86e61dc238c5f308b7801589c; 4a3d761458e26e3bc52448d667663a287c01fad4. - Remove hint to old package as it is not relevant on modern distributions (KNW-1898). Commit: 43a40b3e9e01686630dc3c3ca62f5277af6fe99a. - Clarify multiple spaces and unparseable lines (KNW-1846). Commit: 74ea537b1df56a316917e5059d45f43e00abed85. - Explain Python file suffix usage (KNW-734). Commit: a7adeba641901a3572a441460fc2bfe30a57d62d. - Hint on manipulated spool files (KNW-1508). Commit: 94bcced788c58db9dda079cc3d00a48341b534e7. - Localization sync: Only-De in Sync with Rest (10419142). Commit: 1041914254bdaa698a41311695c75eabbbd80758. Overall impact and accomplishments: - Reduced translation and documentation errors, improving accuracy and consistency across languages, with explicit GUI hints and notranslate markers reducing rework. - Accelerated content updates and release readiness through a structured, KNW-driven workflow and versioning (2.4.0+ releases). - Improved user guidance and readability in docs, lowering support queries related to translation and content state differences. Technologies/skills demonstrated: - Localization and documentation practices, notranslate spans, admonitions, and translation table fixes. - Git-based release management, version bumps, and feature flag alignment (pick-24) for coordinated releases. - Cross-functional collaboration with product and localization teams, aligned with KNW issue tracking (1902, 1904, 1905, etc.).
Month: 2025-08 — Checkmk/checkmk-docs Documentation Localization and UI Guidance Improvements Key features delivered: - Keyboard Macros Enhancement: added examples to improve macro support (KNW-1414). Commits: 788b03a1442400ec801057576a459c9690d677c0; 85d85d887082e349c57ec095f4a2de601c2bbb5. - DeepL Translation Fixes and GUI Hints (KNW-1902): fixed table for DeepL translation; added missing GUI hints across translations. Commits: bc71f8300bc9e3ba2b318d4b0693561ecf7c8610; d254e85b5a700eae20596f9225efec88b72c9698; eee5f86f6f3eabd86e61dc238c5f308b7801589c; 4a3d761458e26e3bc52448d667663a287c01fad4. - Admonitions added to surface differences and multiple data points (KNW-1904, KNW-1905): added admonition indicating differences between article and current state; added admonition hinting on multiple data points. Commits: cfe3968bd3a4d45b7a47b048bbdeb8fefad75dcd; 9c4a25af24080126ab1ac41d4b1ba25cb7fc07fd. - Localization and content clarity improvements: Notranslate spans for English-only content (KNW-190? Notranslate) Commits: 6d32bd3817f2f02b113b58edba6c569987fa3056; Localization sync: Only-De in Sync with Rest (10419142); Remove hint to old package (KNW-1898); Version bump (KNW-734, 10419142, etc). Commits: 6d32bd3817f2f02b113b58edba6c569987fa3056; 1041914254bdaa698a41311695c75eabbbd80758; 43a40b3e9e01686630dc3c3ca62f5277af6fe99a; a7adeba641901a3572a441460fc2bfe30a57d62d; (note: individual commits referenced inline) - Release readiness and platform alignment: Release 2.4.0 version bump; KNW-1905 development updates up to 2.4.0p10 including texts/images/review readiness; browser keycodes and keysyms clarifications; experimental feature addition. Commits: fb2dd920128ce4f5dd939395fae7897001d102a2; 147af8be9f299c2c318cbeb5d6cea68209a7bd68; 3ad4b91fa64ab1d412730cdf6b09b9c4d6b6bbd2; 02fd6f0e6a7eb828480c9daccbd9240bef03c091; bfc2059bb461b93a60195e5bb77126b6729b630b; e48a33b83c6ccd4441fae587b1456913c3b524cb; f8794aebcc0c097754f79376f14842e790c09f3e; fae44b290713f7d71fb0393f1aaa6daac6819499. Major bugs fixed: - DeepL translation: fixed table and added GUI hints across translations (KNW-1902). Commits: bc71f8300bc9e3ba2b318d4b0693561ecf7c8610; d254e85b5a700eae20596f9225efec88b72c9698; eee5f86f6f3eabd86e61dc238c5f308b7801589c; 4a3d761458e26e3bc52448d667663a287c01fad4. - Remove hint to old package as it is not relevant on modern distributions (KNW-1898). Commit: 43a40b3e9e01686630dc3c3ca62f5277af6fe99a. - Clarify multiple spaces and unparseable lines (KNW-1846). Commit: 74ea537b1df56a316917e5059d45f43e00abed85. - Explain Python file suffix usage (KNW-734). Commit: a7adeba641901a3572a441460fc2bfe30a57d62d. - Hint on manipulated spool files (KNW-1508). Commit: 94bcced788c58db9dda079cc3d00a48341b534e7. - Localization sync: Only-De in Sync with Rest (10419142). Commit: 1041914254bdaa698a41311695c75eabbbd80758. Overall impact and accomplishments: - Reduced translation and documentation errors, improving accuracy and consistency across languages, with explicit GUI hints and notranslate markers reducing rework. - Accelerated content updates and release readiness through a structured, KNW-driven workflow and versioning (2.4.0+ releases). - Improved user guidance and readability in docs, lowering support queries related to translation and content state differences. Technologies/skills demonstrated: - Localization and documentation practices, notranslate spans, admonitions, and translation table fixes. - Git-based release management, version bumps, and feature flag alignment (pick-24) for coordinated releases. - Cross-functional collaboration with product and localization teams, aligned with KNW issue tracking (1902, 1904, 1905, etc.).
July 2025 monthly summary for Checkmk/checkmk-docs focusing on delivering business value and technical excellence across documentation, release management, security, and build quality. The month featured coordinated, multi-repo progress with a strong emphasis on accuracy, localization, and maintainability.
July 2025 monthly summary for Checkmk/checkmk-docs focusing on delivering business value and technical excellence across documentation, release management, security, and build quality. The month featured coordinated, multi-repo progress with a strong emphasis on accuracy, localization, and maintainability.
June 2025 – Checkmk/checkmk-docs: Delivered cross-language consistency, release-readiness improvements, and architectural modernization, while stabilizing the docs platform with targeted bug fixes and onboarding enhancements. Business value focused on reducing contributor confusion, accelerating release planning, and improving maintainability of the documentation stack. Key outcomes include cross-language changes applied after review, updated patch-release targeting guidance, a foundational move to a common architecture, onboarding guide enhancements, and release hygiene through version bumps. Key deliverables: - Apply review changes across languages in docs: ensured parity between language implementations and captured in the commit 3639118f5d4a889849d31f09ad674f7dca8dcbac. - Patch release target hints: clarified latest patch release as update target across docs (commits 92705f7186b15996fe7cbad3b460008f9852145b, 5c446b0af34e9d32aea0a26bb98585ba2fec693e, e287438551647cbb935a06d0d0ce2b89ccf553da). - Move to common architecture: architectural refactor to consolidate core under a common layer (commit a97c82ef1f92f883e3395ab0207e9f4d83e531c3). - Onboarding guide patchsets: integrated patches from Hojjat to improve onboarding docs (commits a6bb33c9600fa0f616e623fbb3f22e037973a7f1, 0d95c03a99ffdf8b87dea64ef7a8f5e18f96d04d, ec2c4c83005d7104c1b9ba16a104f5105e402df6). - Version bumps and minor release hygiene: aligned 2.4.x series across the project (commits 21832e11ca1ff1383fb168d39a71ae3a91e6a1ab, c24aabaa57e25435be48064cabad4eed3d407353). - Additional enhancements: ongoing improvements including the addition of admonitions and related doc structure improvements (commit 8dd27c29b72eee6cf6e17120f613f26065fc5b6b). Major bugs fixed: - Guidelines cleanup: Removed references to outdated developer guidelines to avoid confusion (commits a8b8e8d41ff84e2177392af86bddc24aad227b52, 1d4b5529126dd91142e3db19a3abc93ed77a7469). - Terminal screenshot improvements: Correctly classified color terminal screenshots not in a TUI window (commit 56f5f3282d2add7f7e1d969c3b08871933aa6406). - Adjust revision date: Fixed date revision issue (commit 92bfad281e9b436f2a9d030ba091862754dc5cce). - Revert: Sanitize TUI XML files for correct display: Restored previous behavior to fix display issues (commit 6fdaf9d209f8908ae929fe63d4099a4af3380c3d). Overall impact and accomplishments: - Reduced contributor confusion and onboarding time by cleaning outdated guidelines and enhancing onboarding patchsets. - Improved release readiness and planning accuracy through explicit patch-release hints and versioning alignment. - Strengthened maintainability and consistency via a move to a common architecture and targeted refactors across languages. - Delivered tangible business value with faster documentation updates, consistent language support, and stable release workflows. Technologies/skills demonstrated: - Multilingual documentation parity, architectural refactoring (common layer), and preprocessor macro usage for SaaS scenarios. - Release hygiene: version bumps, patch targeting, and structured documentation patches. - Localization/translation improvements and improved doc structuring (admonitions, pagetitle translations).
June 2025 – Checkmk/checkmk-docs: Delivered cross-language consistency, release-readiness improvements, and architectural modernization, while stabilizing the docs platform with targeted bug fixes and onboarding enhancements. Business value focused on reducing contributor confusion, accelerating release planning, and improving maintainability of the documentation stack. Key outcomes include cross-language changes applied after review, updated patch-release targeting guidance, a foundational move to a common architecture, onboarding guide enhancements, and release hygiene through version bumps. Key deliverables: - Apply review changes across languages in docs: ensured parity between language implementations and captured in the commit 3639118f5d4a889849d31f09ad674f7dca8dcbac. - Patch release target hints: clarified latest patch release as update target across docs (commits 92705f7186b15996fe7cbad3b460008f9852145b, 5c446b0af34e9d32aea0a26bb98585ba2fec693e, e287438551647cbb935a06d0d0ce2b89ccf553da). - Move to common architecture: architectural refactor to consolidate core under a common layer (commit a97c82ef1f92f883e3395ab0207e9f4d83e531c3). - Onboarding guide patchsets: integrated patches from Hojjat to improve onboarding docs (commits a6bb33c9600fa0f616e623fbb3f22e037973a7f1, 0d95c03a99ffdf8b87dea64ef7a8f5e18f96d04d, ec2c4c83005d7104c1b9ba16a104f5105e402df6). - Version bumps and minor release hygiene: aligned 2.4.x series across the project (commits 21832e11ca1ff1383fb168d39a71ae3a91e6a1ab, c24aabaa57e25435be48064cabad4eed3d407353). - Additional enhancements: ongoing improvements including the addition of admonitions and related doc structure improvements (commit 8dd27c29b72eee6cf6e17120f613f26065fc5b6b). Major bugs fixed: - Guidelines cleanup: Removed references to outdated developer guidelines to avoid confusion (commits a8b8e8d41ff84e2177392af86bddc24aad227b52, 1d4b5529126dd91142e3db19a3abc93ed77a7469). - Terminal screenshot improvements: Correctly classified color terminal screenshots not in a TUI window (commit 56f5f3282d2add7f7e1d969c3b08871933aa6406). - Adjust revision date: Fixed date revision issue (commit 92bfad281e9b436f2a9d030ba091862754dc5cce). - Revert: Sanitize TUI XML files for correct display: Restored previous behavior to fix display issues (commit 6fdaf9d209f8908ae929fe63d4099a4af3380c3d). Overall impact and accomplishments: - Reduced contributor confusion and onboarding time by cleaning outdated guidelines and enhancing onboarding patchsets. - Improved release readiness and planning accuracy through explicit patch-release hints and versioning alignment. - Strengthened maintainability and consistency via a move to a common architecture and targeted refactors across languages. - Delivered tangible business value with faster documentation updates, consistent language support, and stable release workflows. Technologies/skills demonstrated: - Multilingual documentation parity, architectural refactoring (common layer), and preprocessor macro usage for SaaS scenarios. - Release hygiene: version bumps, patch targeting, and structured documentation patches. - Localization/translation improvements and improved doc structuring (admonitions, pagetitle translations).
May 2025 focused on finishing 2.4.0 release readiness for Checkmk docs, modernization of version macros, and expanding localization while tightening documentation quality and maintainability. Key activities included release-topic updates, migration-alignment cleanup, and removal of legacy beta references; macro revdate adjustments and removal of obsolete {v20} macro; introduction of IT/JA/ES/FR/PT-BR asciidoc menus with a standardized version macro; codebase organization improvements (consistent block IDs; moving localchecks and spool_directory to development); IT translation inclusion; HTML/TUI screenshot references; content synchronization across all 2.4.0 reviews; and KNW-related items prepared for first review with patch application. Business value focus: accelerated release readiness, reduced migration risk, broader localization reach, and improved doc maintainability.
May 2025 focused on finishing 2.4.0 release readiness for Checkmk docs, modernization of version macros, and expanding localization while tightening documentation quality and maintainability. Key activities included release-topic updates, migration-alignment cleanup, and removal of legacy beta references; macro revdate adjustments and removal of obsolete {v20} macro; introduction of IT/JA/ES/FR/PT-BR asciidoc menus with a standardized version macro; codebase organization improvements (consistent block IDs; moving localchecks and spool_directory to development); IT translation inclusion; HTML/TUI screenshot references; content synchronization across all 2.4.0 reviews; and KNW-related items prepared for first review with patch application. Business value focus: accelerated release readiness, reduced migration risk, broader localization reach, and improved doc maintainability.
April 2025 highlights: Delivered macro-based versioning and doc standardization (KNW-1639) and macro modernization (KNW-1640), enabling consistent releases and easier localization. Completed Linux-focused scaffolding and OS-compatibility cleanup (KNW-1678) to align guidance with target deployment. Enhanced technical preview materials (KNW-1768) with images, first draft, hints, readability improvements, examples, links, and ports docs. Prepared internationalization readiness for translations and updated metadata for versioned docs. Major bugs fixed include KNW-1419 dynamic state restoration and KNW-1782 readability/formatting improvements, along with a typo fix, reducing user confusion and support overhead.
April 2025 highlights: Delivered macro-based versioning and doc standardization (KNW-1639) and macro modernization (KNW-1640), enabling consistent releases and easier localization. Completed Linux-focused scaffolding and OS-compatibility cleanup (KNW-1678) to align guidance with target deployment. Enhanced technical preview materials (KNW-1768) with images, first draft, hints, readability improvements, examples, links, and ports docs. Prepared internationalization readiness for translations and updated metadata for versioned docs. Major bugs fixed include KNW-1419 dynamic state restoration and KNW-1782 readability/formatting improvements, along with a typo fix, reducing user confusion and support overhead.
In March 2025, the Checkmk Docs team delivered focused, high-impact documentation enhancements across bakery tooling, special agents, and MKP/extensions, driving adoption, accuracy, and cross-version guidance. Key outcomes include a unified Bakery API/docs experience aligned to the new rulespec API, improved navigation and naming for Special Agents, and updated visuals and compatibility notes for MKP/Extensions up to v25, with explicit memory usage guidance and packaging best practices. Targeted fixes (e.g., broken links and snippet corrections) reduced onboarding friction and support load for bakery-based checks and integrations.
In March 2025, the Checkmk Docs team delivered focused, high-impact documentation enhancements across bakery tooling, special agents, and MKP/extensions, driving adoption, accuracy, and cross-version guidance. Key outcomes include a unified Bakery API/docs experience aligned to the new rulespec API, improved navigation and naming for Special Agents, and updated visuals and compatibility notes for MKP/Extensions up to v25, with explicit memory usage guidance and packaging best practices. Targeted fixes (e.g., broken links and snippet corrections) reduced onboarding friction and support load for bakery-based checks and integrations.
February 2025 monthly summary for Checkmk/checkmk-docs. Focused on delivering SaaS-ready capabilities, improving reliability, and accelerating adoption, with cross-team collaboration around docs and release readiness.
February 2025 monthly summary for Checkmk/checkmk-docs. Focused on delivering SaaS-ready capabilities, improving reliability, and accelerating adoption, with cross-team collaboration around docs and release readiness.
Monthly summary for 2025-01 in Checkmk/checkmk-docs focusing on documentation improvements for multi-environment deployment, authentication, and monitoring integrations. Delivered comprehensive agent deployment and TLS guidance across on-prem and SaaS, enhanced REST API documentation with environment-specific conditional rendering, expanded monitoring integration docs with SaaS/on-prem context, deprecated Nagstamon integration docs, and clarified SaaS authentication and user roles.
Monthly summary for 2025-01 in Checkmk/checkmk-docs focusing on documentation improvements for multi-environment deployment, authentication, and monitoring integrations. Delivered comprehensive agent deployment and TLS guidance across on-prem and SaaS, enhanced REST API documentation with environment-specific conditional rendering, expanded monitoring integration docs with SaaS/on-prem context, deprecated Nagstamon integration docs, and clarified SaaS authentication and user roles.
December 2024 monthly summary for Checkmk/checkmk-docs: Consolidated macro-driven development across the docs/codebase, advanced SaaS vs On-Prem differentiation, and improved agent deployment hygiene. The month delivered standardized build-time macros, clarified localization/deployment guidance, and reduced maintenance overhead by removing non-working and non-SaaS-usable components. Security and diagnostics visibility were enhanced, with added SaaS-specific assets and password safeguards. This set foundations for scalable localization, safer defaults, and clearer customer guidance.
December 2024 monthly summary for Checkmk/checkmk-docs: Consolidated macro-driven development across the docs/codebase, advanced SaaS vs On-Prem differentiation, and improved agent deployment hygiene. The month delivered standardized build-time macros, clarified localization/deployment guidance, and reduced maintenance overhead by removing non-working and non-SaaS-usable components. Security and diagnostics visibility were enhanced, with added SaaS-specific assets and password safeguards. This set foundations for scalable localization, safer defaults, and clearer customer guidance.
Month: 2024-11 — Delivered targeted documentation enhancements for MySQL monitoring configuration within Checkmk-docs, focusing on clarity for mysql.cfg setup, authentication, and secure password management with .mylogin.cnf. This work supports faster onboarding and reduces misconfigurations in production monitoring. Overall, this effort reinforces security best practices and improves user experience when configuring MySQL monitoring in Checkmk.
Month: 2024-11 — Delivered targeted documentation enhancements for MySQL monitoring configuration within Checkmk-docs, focusing on clarity for mysql.cfg setup, authentication, and secure password management with .mylogin.cnf. This work supports faster onboarding and reduces misconfigurations in production monitoring. Overall, this effort reinforces security best practices and improves user experience when configuring MySQL monitoring in Checkmk.
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