percona/percona-server-mongodb
Jul 2025 – Mar 2026
8 Months active
Languages Used
C++JavaScriptIDLC
Technical Skills
Backend DevelopmentBuild System ConfigurationC++Code Ownership ManagementCode RefactoringConcurrency
Cole Harbeck
PROFILE
Cole Harbeck
Over eight months, this developer contributed to percona/percona-server-mongodb by delivering features and fixes that improved reliability, observability, and maintainability. They enhanced server concurrency and monitoring by increasing connection limits, adding telemetry counters, and exposing slow query metrics. Their work included refactoring serverStatus components for clearer code ownership, upgrading zlib for better data compression, and implementing robust FTDC data handling to prevent crashes from large BSON samples. Using C++ and JavaScript, they focused on backend development, concurrency, and testing, consistently addressing race conditions, improving test reliability, and aligning API surfaces to streamline operational workflows and support production-grade deployments.
Overall Statistics
Feature vs Bugs
75%Features
Repository Contributions
20Total
Bugs
4
Commits
20
Features
12
Lines of code
7,634
Activity Months8
Your Network
596 peopleShared Repositories
247
Work History
March 2026
3 Commits • 2 Features
Mar 1, 2026March 2026 monthly summary for percona/percona-server-mongodb. Focused on improving reliability for high-concurrency replica operations and enhancing data efficiency through a thread-safety/observability upgrade and a zlib library upgrade. Delivered tangible business value by reducing risk in replication monitoring and improving compression performance for storage and network efficiency.
3 Commits • 2 Features
Mar 1, 2026March 2026 monthly summary for percona/percona-server-mongodb. Focused on improving reliability for high-concurrency replica operations and enhancing data efficiency through a thread-safety/observability upgrade and a zlib library upgrade. Delivered tangible business value by reducing risk in replication monitoring and improving compression performance for storage and network efficiency.
March 2026
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for percona/percona-server-mongodb: Delivered targeted fixes and a code readability improvement that enhance stability and maintainability of the FTDC data collection and core controller logic.
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for percona/percona-server-mongodb: Delivered targeted fixes and a code readability improvement that enhance stability and maintainability of the FTDC data collection and core controller logic.
January 2026
3 Commits • 2 Features
Jan 1, 2026January 2026 monthly summary for the percona/percona-server-mongodb repository. This period focused on stabilizing test reliability, expanding observability, and aligning API surfaces to improve developer experience and operational efficiency. Key outcomes across features and bugs include stabilizing the ShutdownBehavior tests, introducing performance monitoring for slow queries, and standardizing parameter formatting for IngressRequestRateLimiterAppExemptions. These efforts reduce maintenance costs, enhance issue detection, and contribute to a more robust and observable server suitable for production workloads.
3 Commits • 2 Features
Jan 1, 2026January 2026 monthly summary for the percona/percona-server-mongodb repository. This period focused on stabilizing test reliability, expanding observability, and aligning API surfaces to improve developer experience and operational efficiency. Key outcomes across features and bugs include stabilizing the ShutdownBehavior tests, introducing performance monitoring for slow queries, and standardizing parameter formatting for IngressRequestRateLimiterAppExemptions. These efforts reduce maintenance costs, enhance issue detection, and contribute to a more robust and observable server suitable for production workloads.
January 2026
December 2025
4 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for percona/percona-server-mongodb: Delivered concurrency and observability improvements, expanded FTDC testing, and enhanced replica-set routing tagging. Through these efforts, the team increased throughput resilience under high load, improved telemetry fidelity, and strengthened data capture and routing correctness. The work lays a foundation for faster troubleshooting, better capacity planning, and more robust observability across high-concurrency deployments.
December 2025
4 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for percona/percona-server-mongodb: Delivered concurrency and observability improvements, expanded FTDC testing, and enhanced replica-set routing tagging. Through these efforts, the team increased throughput resilience under high load, improved telemetry fidelity, and strengthened data capture and routing correctness. The work lays a foundation for faster troubleshooting, better capacity planning, and more robust observability across high-concurrency deployments.
November 2025
2 Commits • 2 Features
Nov 1, 2025Concise monthly summary for 2025-11: Delivered two core features in percona/percona-server-mongodb that improve observability, logging governance, and metrics extraction. RamLog Configuration enables configurable RAM-log constraints (max lines and size), reducing logging overhead and enabling performance tuning. FTDC Double to Int64 Conversion implements proper numeric extraction per FTDC specs, correctly handling NaN and out-of-bounds values for reliable monitoring data. No major bugs fixed this month. Overall impact: improved operational control, better troubleshooting, and more accurate analytics. Technologies/skills demonstrated: C++ parameterization, robust numeric conversion, NaN/out-of-range handling, FTDC data workflows, and code review collaboration.
2 Commits • 2 Features
Nov 1, 2025Concise monthly summary for 2025-11: Delivered two core features in percona/percona-server-mongodb that improve observability, logging governance, and metrics extraction. RamLog Configuration enables configurable RAM-log constraints (max lines and size), reducing logging overhead and enabling performance tuning. FTDC Double to Int64 Conversion implements proper numeric extraction per FTDC specs, correctly handling NaN and out-of-bounds values for reliable monitoring data. No major bugs fixed this month. Overall impact: improved operational control, better troubleshooting, and more accurate analytics. Technologies/skills demonstrated: C++ parameterization, robust numeric conversion, NaN/out-of-range handling, FTDC data workflows, and code review collaboration.
November 2025
October 2025
1 Commits • 1 Features
Oct 1, 2025Month: 2025-10 — Summary of developer contributions for percona/percona-server-mongodb. Focused on observability improvements to aid monitoring and capacity planning for large data workloads. Key feature delivered: FTDC Visibility Enhancement for ServerStatus, which exposes the sizes of serverStatus sections when the aggregate FTDC payload is large, enabling faster diagnosis, better monitoring dashboards, and proactive capacity planning for large data collections. Major bugs fixed: none reported this month. Overall impact and accomplishments: strengthened operational visibility into diagnostic data, reduced time to diagnose issues in large deployments, and improved reliability of monitoring for production systems. Technologies/skills demonstrated: FTDC/diagnostics, serverStatus, MongoDB internals, performance monitoring, Git-based collaboration, and cross-repo coordination.
October 2025
1 Commits • 1 Features
Oct 1, 2025Month: 2025-10 — Summary of developer contributions for percona/percona-server-mongodb. Focused on observability improvements to aid monitoring and capacity planning for large data workloads. Key feature delivered: FTDC Visibility Enhancement for ServerStatus, which exposes the sizes of serverStatus sections when the aggregate FTDC payload is large, enabling faster diagnosis, better monitoring dashboards, and proactive capacity planning for large data collections. Major bugs fixed: none reported this month. Overall impact and accomplishments: strengthened operational visibility into diagnostic data, reduced time to diagnose issues in large deployments, and improved reliability of monitoring for production systems. Technologies/skills demonstrated: FTDC/diagnostics, serverStatus, MongoDB internals, performance monitoring, Git-based collaboration, and cross-repo coordination.
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025: Focused on maintainability and ownership improvements for the server_status component in Percona Server for MongoDB. Delivered a dedicated sub-directory refactor that moves server_status code into an N&O owned area, improving organization, ownership clarity, and future maintainability. The work aligns with architectural simplification goals and reduces future churn.
1 Commits • 1 Features
Sep 1, 2025September 2025: Focused on maintainability and ownership improvements for the server_status component in Percona Server for MongoDB. Delivered a dedicated sub-directory refactor that moves server_status code into an N&O owned area, improving organization, ownership clarity, and future maintainability. The work aligns with architectural simplification goals and reduces future churn.
September 2025
July 2025
4 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for percona/percona-server-mongodb focusing on reliability, maintainability, and clearer ownership. Deliverables center on network robustness, configuration validation, and code organization, supporting safer deployments and faster iteration cycles.
July 2025
4 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for percona/percona-server-mongodb focusing on reliability, maintainability, and clearer ownership. Deliverables center on network robustness, configuration validation, and code organization, supporting safer deployments and faster iteration cycles.
Activity
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Quality Metrics
Correctness98.6%
Maintainability90.0%
Architecture92.0%
Performance88.0%
AI Usage21.0%
Skills & Technologies
Programming Languages
CC++IDLJavaScript
Technical Skills
API designBSON handlingBackend DevelopmentBuild System ConfigurationC programmingC++C++ developmentC++ programmingCode Ownership ManagementCode RefactoringConcurrencyJavaScriptJavaScript testingMongoDBNetwork Configuration
Repositories Contributed To
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