cilium/tetragon
Oct 2025 – May 2026
8 Months active
Languages Used
GoCMakefileMarkdownprotobufYAMLJSON
Technical Skills
Bug FixKernel DevelopmentSystem ProgrammingBPFC ProgrammingC programming
Andy Strohman
PROFILE
Andy Strohman
Over eight months, contributed to the cilium/tetragon repository by building advanced kernel tracing and observability features focused on reliability, cross-architecture support, and robust policy management. Developed and refined dynamic tracing with BPF and Go, enabling CEL-based filtering, multi-target uprobe policies, and ARM64 compatibility. Enhanced error handling, memory management, and argument resolution for kprobes, uprobes, and USDT, while expanding automated testing and documentation. Addressed kernel compatibility issues, improved build automation with Makefile scripting, and stabilized dependency management. These efforts reduced false positives, improved policy load success, and strengthened the platform’s safety and maintainability for production-grade system tracing workloads.
Overall Statistics
Feature vs Bugs
71%Features
Repository Contributions
94Total
Bugs
9
Commits
94
Features
22
Lines of code
10,778
Activity Months8
Your Network
164 peopleSame Organization
@isovalent.com69
Work History
May 2026
10 Commits • 5 Features
May 1, 2026May 2026 focused on enhancing policy loading reliability, expanding testing tooling, and stabilizing dependencies. Key features delivered include multi-target/multi-attach Uprobe policies, testing utilities for nested anonymous structs in tracing policies, a MultiCmdTrigger for policy tests, and documentation clarifications on followForks. Dependency update controls were added to prevent automated digest updates for critical Go modules, reducing CI fragility. These efforts improved policy load success rates, reduced debugging time, and strengthened overall platform stability for production tracing workloads. Technologies demonstrated include Go, BPF, uprobe instrumentation, and the policy testing framework.
10 Commits • 5 Features
May 1, 2026May 2026 focused on enhancing policy loading reliability, expanding testing tooling, and stabilizing dependencies. Key features delivered include multi-target/multi-attach Uprobe policies, testing utilities for nested anonymous structs in tracing policies, a MultiCmdTrigger for policy tests, and documentation clarifications on followForks. Dependency update controls were added to prevent automated digest updates for critical Go modules, reducing CI fragility. These efforts improved policy load success rates, reduced debugging time, and strengthened overall platform stability for production tracing workloads. Technologies demonstrated include Go, BPF, uprobe instrumentation, and the policy testing framework.
May 2026
April 2026
18 Commits • 3 Features
Apr 1, 2026April 2026: Strengthened the observability and stability of the tetragon tracing stack. Delivered robust fault detection and error handling for BPF tracing probes, expanded external BTF-based kfunc support with gating to prevent verifier rejections, and refined CEL-based argument parsing and USDT map integration. Expanded test coverage for NULL string arguments and probe indexing to reduce event drops and policy load failures. These efforts improved reliability, safety, and business value of kernel-tracing observability.
April 2026
18 Commits • 3 Features
Apr 1, 2026April 2026: Strengthened the observability and stability of the tetragon tracing stack. Delivered robust fault detection and error handling for BPF tracing probes, expanded external BTF-based kfunc support with gating to prevent verifier rejections, and refined CEL-based argument parsing and USDT map integration. Expanded test coverage for NULL string arguments and probe indexing to reduce event drops and policy load failures. These efforts improved reliability, safety, and business value of kernel-tracing observability.
March 2026
7 Commits • 3 Features
Mar 1, 2026March 2026 monthly summary for cilium/tetragon focuses on delivering robust observability and testing capabilities, while improving build reliability to support faster, safer releases.
7 Commits • 3 Features
Mar 1, 2026March 2026 monthly summary for cilium/tetragon focuses on delivering robust observability and testing capabilities, while improving build reliability to support faster, safer releases.
March 2026
February 2026
20 Commits • 3 Features
Feb 1, 2026February 2026 — Delivered major enhancements to dynamic tracing and reliability for cilium/tetragon. USDT-driven dynamic tracing with preload support introduced; kernel compatibility and argument indexing fixes across 5.4 and RHEL8.9; pageout refactor and library extraction to support arbitrary memory sizes; enhanced uprobe resilience against memory/page faults during BTF resolution; and stability cleanups to maintain a healthy baseline.
February 2026
20 Commits • 3 Features
Feb 1, 2026February 2026 — Delivered major enhancements to dynamic tracing and reliability for cilium/tetragon. USDT-driven dynamic tracing with preload support introduced; kernel compatibility and argument indexing fixes across 5.4 and RHEL8.9; pageout refactor and library extraction to support arbitrary memory sizes; enhanced uprobe resilience against memory/page faults during BTF resolution; and stability cleanups to maintain a healthy baseline.
January 2026
15 Commits • 3 Features
Jan 1, 2026January 2026 (repo: cilium/tetragon) focused on correctness, reliability, cross-architecture support, and expanded tracing capabilities. Business value delivered includes fewer false positives in selector-based filtering, improved data resolution on ARM64 uprobes, enhanced performance and maintainability of argument filtering, and richer tracing features with string argument support and USDT filtering. Key features and improvements: - Selector Filtering Correctness: Fixed a bug where a selector could match if only some filters matched; now all filters must match to ensure correctness as capabilities change. (Commit: 7d16d8f2a981a49810805aedada6a97a6330a54d) - Arm64 pt_regs data source resolution: Correct data source resolution for pt_regs on arm64 uprobes; added tests to ensure correct data retrieval on arm64. (Commits: c400551506395d72433c287b8b189b8d9fcff3b8; 57c6bf8e2915e07c865b7463145dd5065bc42bee) - Performance and refactoring of argument filtering: Centralized and optimized argument filtering; early returns on filter failures; split filter_arg for small kernels; adjusted for kernel instruction budgets to enable future features. (Commits: 8cee1db5aa58ff522e9e88d2dbc0551ecb989472; 66c0a0e5f02bf4b916519269334f7a9fbcb3cad6; 2ef89469343e2f87570091d720e243adf4e4f4db; 4daf8ab3a0643109bbef5d86b75671aab1aecb61; 74438d7ff35e3a3de80bf456b44bc45d4f22d605) - Uprobe string argument support and preload: Added string-argument support for uprobes with preload resolution; arm64 preload program enabled; extended tests for string args and paged memory scenarios. (Commits: e862ccf6b150da2cf683ce06946a3553d3a2f357; e897eaf501f9e25eee2cf575955869a9e123347c; 47c2ef5826693f1dbce12e3c53a3096432436f2c; f9c47507eebe42b493a7837eaeffcb77166e0306) - USDT string argument filtering and maps support: Enabled filtering by string arguments in USDT tracing by loading filter maps; added tests for string handling and USDT argument filtering. (Commits: a4c084adf7a6a0f319ecd497ae92e92bbe8c7592; 0aa7c187c85628fd580d0a605aa737a1c5e0d7f3; c5f5de15529c5ab1f4d4940fb0a09c2075602ef1)
15 Commits • 3 Features
Jan 1, 2026January 2026 (repo: cilium/tetragon) focused on correctness, reliability, cross-architecture support, and expanded tracing capabilities. Business value delivered includes fewer false positives in selector-based filtering, improved data resolution on ARM64 uprobes, enhanced performance and maintainability of argument filtering, and richer tracing features with string argument support and USDT filtering. Key features and improvements: - Selector Filtering Correctness: Fixed a bug where a selector could match if only some filters matched; now all filters must match to ensure correctness as capabilities change. (Commit: 7d16d8f2a981a49810805aedada6a97a6330a54d) - Arm64 pt_regs data source resolution: Correct data source resolution for pt_regs on arm64 uprobes; added tests to ensure correct data retrieval on arm64. (Commits: c400551506395d72433c287b8b189b8d9fcff3b8; 57c6bf8e2915e07c865b7463145dd5065bc42bee) - Performance and refactoring of argument filtering: Centralized and optimized argument filtering; early returns on filter failures; split filter_arg for small kernels; adjusted for kernel instruction budgets to enable future features. (Commits: 8cee1db5aa58ff522e9e88d2dbc0551ecb989472; 66c0a0e5f02bf4b916519269334f7a9fbcb3cad6; 2ef89469343e2f87570091d720e243adf4e4f4db; 4daf8ab3a0643109bbef5d86b75671aab1aecb61; 74438d7ff35e3a3de80bf456b44bc45d4f22d605) - Uprobe string argument support and preload: Added string-argument support for uprobes with preload resolution; arm64 preload program enabled; extended tests for string args and paged memory scenarios. (Commits: e862ccf6b150da2cf683ce06946a3553d3a2f357; e897eaf501f9e25eee2cf575955869a9e123347c; 47c2ef5826693f1dbce12e3c53a3096432436f2c; f9c47507eebe42b493a7837eaeffcb77166e0306) - USDT string argument filtering and maps support: Enabled filtering by string arguments in USDT tracing by loading filter maps; added tests for string handling and USDT argument filtering. (Commits: a4c084adf7a6a0f319ecd497ae92e92bbe8c7592; 0aa7c187c85628fd580d0a605aa737a1c5e0d7f3; c5f5de15529c5ab1f4d4940fb0a09c2075602ef1)
January 2026
December 2025
12 Commits • 3 Features
Dec 1, 2025December 2025 monthly summary for cilium/tetragon focusing on reliability, data quality, and cross-architecture support. Delivered enhanced error reporting for kprobe/tracepoint data, policy-aligned rate limiting, and ARM64 support across registry/uprobes with expanded test coverage. Implementations reduce noise, improve observability, and broaden hardware coverage while maintaining safety guarantees.
December 2025
12 Commits • 3 Features
Dec 1, 2025December 2025 monthly summary for cilium/tetragon focusing on reliability, data quality, and cross-architecture support. Delivered enhanced error reporting for kprobe/tracepoint data, policy-aligned rate limiting, and ARM64 support across registry/uprobes with expanded test coverage. Implementations reduce noise, improve observability, and broaden hardware coverage while maintaining safety guarantees.
November 2025
11 Commits • 2 Features
Nov 1, 2025November 2025 (2025-11) – cilium/tetragon: Focused improvements to uprobes, pointer handling, and tracing policy clarity, delivering higher reliability and business value. Key outcomes include argument-resolution for uprobes, robust matching controls, safer dereference handling, build hygiene, and policy documentation with a new tracing parameter. All changes include test coverage to reduce runtime errors and false positives, enabling more accurate observability.
11 Commits • 2 Features
Nov 1, 2025November 2025 (2025-11) – cilium/tetragon: Focused improvements to uprobes, pointer handling, and tracing policy clarity, delivering higher reliability and business value. Key outcomes include argument-resolution for uprobes, robust matching controls, safer dereference handling, build hygiene, and policy documentation with a new tracing parameter. All changes include test coverage to reduce runtime errors and false positives, enabling more accurate observability.
November 2025
October 2025
1 Commits
Oct 1, 20252025-10 monthly summary for cilium/tetragon focusing on stability improvements in kernel selectors and tracing policy data filters. No new features shipped this month; key maintenance work delivered to improve reliability and reduce crash risk in policy evaluation.
October 2025
1 Commits
Oct 1, 20252025-10 monthly summary for cilium/tetragon focusing on stability improvements in kernel selectors and tracing policy data filters. No new features shipped this month; key maintenance work delivered to improve reliability and reduce crash risk in policy evaluation.
Activity
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Quality Metrics
Correctness96.4%
Maintainability86.0%
Architecture87.2%
Performance86.8%
AI Usage21.8%
Skills & Technologies
Programming Languages
CGoJSONMakefileMarkdownYAMLprotobuf
Technical Skills
API DevelopmentAPI designBPFBug FixC ProgrammingC programmingCELCI/CDDevOpsDocumentationGitHub ActionsGoGo DevelopmentGo ProgrammingGo programming
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