OpenNMS/opennms
Sep 2025 – Feb 2026
4 Months active
Languages Used
AsciiDocJavaAsciidocasciidocXML
Technical Skills
Database MonitoringDocumentationJDBCJavaUnit Testingdatabase management
David Schlenk
PROFILE
David Schlenk
David Schlenk contributed to the OpenNMS/opennms repository over four months, focusing on observability, documentation, and data integrity. He enhanced the JDBCQueryMonitor to improve incident troubleshooting by including executed queries in unavailability messages and refactored driver loading for better compatibility using Java and JDBC. David improved documentation by clarifying deprecation plans and fixing configuration rendering, reducing user confusion. He addressed data integrity by correcting foreign identity field mapping in CollectionSetMapper, ensuring accurate analytics. Additionally, he integrated Prometheus monitoring by managing Maven dependencies and schema inclusion, enabling metrics-driven operations. His work demonstrated depth in Java, Maven, and technical writing.
Overall Statistics
Feature vs Bugs
60%Features
Repository Contributions
5Total
Bugs
2
Commits
5
Features
3
Lines of code
852
Activity Months4
Your Network
26 peopleShared Repositories
26
Atif AliMember
aurangzebMember
Atlassian BambooMember
Chandra GorantlaMember
Chandra GorantlaMember
Christian PapeMember
CI/CD SystemMember
DinoMember
David SchlenkMember
Work History
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026: Delivered Prometheus monitoring integration for OpenNMS by adding the Prometheus collector XSD dependency to pom.xml and including the collector schema. This enables Prometheus-based metrics collection, dashboards, and alerts, strengthening observability and incident response. No major bugs fixed this month; minor maintenance tasks completed as part of integrating the new monitoring stack. Overall business impact: improved visibility into system performance, faster issue detection, and better data-driven decision making. Technologies/skills demonstrated: Maven dependency management, POM changes, schema inclusion, Prometheus integration, observability best practices.
1 Commits • 1 Features
Feb 1, 2026February 2026: Delivered Prometheus monitoring integration for OpenNMS by adding the Prometheus collector XSD dependency to pom.xml and including the collector schema. This enables Prometheus-based metrics collection, dashboards, and alerts, strengthening observability and incident response. No major bugs fixed this month; minor maintenance tasks completed as part of integrating the new monitoring stack. Overall business impact: improved visibility into system performance, faster issue detection, and better data-driven decision making. Technologies/skills demonstrated: Maven dependency management, POM changes, schema inclusion, Prometheus integration, observability best practices.
February 2026
January 2026
1 Commits
Jan 1, 2026January 2026 monthly summary for OpenNMS/opennms: Delivered a targeted bug fix to correct foreign identity field mapping in CollectionSetMapper, preventing data misrepresentation across collection relationships. The fix, associated with NMS-19362, is implemented in commit 8543da6717edd416fc09aa5ee8e10d14a0af0a51 and signed off by David Schlenk. This improves data integrity and reliability of downstream analytics and dashboards.
January 2026
1 Commits
Jan 1, 2026January 2026 monthly summary for OpenNMS/opennms: Delivered a targeted bug fix to correct foreign identity field mapping in CollectionSetMapper, preventing data misrepresentation across collection relationships. The fix, associated with NMS-19362, is implemented in commit 8543da6717edd416fc09aa5ee8e10d14a0af0a51 and signed off by David Schlenk. This improves data integrity and reliability of downstream analytics and dashboards.
December 2025
2 Commits • 1 Features
Dec 1, 2025Dec 2025 monthly summary for OpenNMS/opennms focused on documentation and maintainability improvements that enhance customer guidance and future-proof the product. Delivered two targeted documentation updates: (1) Deprecation notice for JRobin time series database with an explicit plan for removal in future releases; (2) Alignment of Kafka Producer Configuration documentation by adding a missing newline that fixed header rendering. These changes reduce customer confusion, minimize support friction, and establish clearer deprecation messaging, while preserving docs quality and release readiness.
2 Commits • 1 Features
Dec 1, 2025Dec 2025 monthly summary for OpenNMS/opennms focused on documentation and maintainability improvements that enhance customer guidance and future-proof the product. Delivered two targeted documentation updates: (1) Deprecation notice for JRobin time series database with an explicit plan for removal in future releases; (2) Alignment of Kafka Producer Configuration documentation by adding a missing newline that fixed header rendering. These changes reduce customer confusion, minimize support friction, and establish clearer deprecation messaging, while preserving docs quality and release readiness.
December 2025
September 2025
1 Commits • 1 Features
Sep 1, 20252025-09 monthly summary for OpenNMS/opennms focusing on observability, compatibility, and configuration simplification. Delivered a targeted enhancement to JDBCQueryMonitor that improves incident troubleshooting and cross-environment reliability.
September 2025
1 Commits • 1 Features
Sep 1, 20252025-09 monthly summary for OpenNMS/opennms focusing on observability, compatibility, and configuration simplification. Delivered a targeted enhancement to JDBCQueryMonitor that improves incident troubleshooting and cross-environment reliability.
Activity
Loading activity data...
Quality Metrics
Correctness98.0%
Maintainability92.0%
Architecture92.0%
Performance92.0%
AI Usage28.0%
Skills & Technologies
Programming Languages
AsciiDocAsciidocJavaXMLasciidoc
Technical Skills
Database MonitoringDependency ManagementDocumentationJDBCJavaMavenMockitoUnit Testingdatabase managementdocumentationtechnical writing
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline