Month: 2026-04 — Focused on delivering a performance-oriented taint analysis enhancement in semgrep/semgrep via enabling Run-Taint-Once (RTO) by default, with a safe fallback path to run taint twice. This change aims to speed up scans, reduce noise in findings, and preserve or improve true-positive rates. The work includes a feature flag to revert to the previous behavior if needed, and is coordinated with related rule-repo changes to align annotations and dependencies. Validation was performed through CI and targeted test plans, with diffs showing measurable improvements in performance and findings in several scenarios. No major bug fixes were recorded in this period; the primary value lies in architectural optimization, reliability, and scalability of taint analysis for production workloads.

March 2026 focused on performance, observability, and stability across Semgrep core and related interfaces. Key throughput improvements were delivered by enabling parallel processing in core workflows (targeting and taint config computation) and by enhancing tracing to surface target counts and time distribution, enabling data-driven optimizations. A configurable secret validation timeout reduced user-visible latency. The effort also advanced documentation clarity, OSS onboarding, and developer workflows, while aggressively cleaning legacy code and stabilizing the codebase. In addition, AI-assisted workflow improvements were introduced for code reviews and task management, improving collaboration and throughput. The combined work lays groundwork for faster scans on large repositories, smoother upgrades, and more reliable builds.

February 2026 monthly summary for semgrep/semgrep. This period delivered substantial improvements in observability, performance, and developer experience across the core scanning workflow, aligning with business goals of faster, more reliable scans and clearer visibility into performance. Key outcomes include enhanced telemetry and metrics for scan operations, improved performance visibility, stabilized CI/OSS delivery, and usability enhancements for experiment filtering.

January 2026 monthly summary for semgrep/semgrep focused on delivering CI/automation improvements, observability upgrades, and stabilization efforts that reduce toil and accelerate release cycles. Delivered a comprehensive set of CI enhancements, upgraded tracing and telemetry, and consolidated maintenance processes to improve reliability and velocity across OSS and proprietary builds.

December 2025 performance summary for semgrep/semgrep: Stability wins, CI/process improvements, and OSS/Pro alignment that collectively reduce release risk and accelerate delivery. Key outcomes include stabilizing fixpoint worker timeouts by reverting the default multicore parameters; delivering CI and release process improvements (Makefile release target reintroduction, GitHub Actions-based snapshot testing, and general CI reliability fixes); aligning Semgrep Pro with OSS and enhancing PHP AST parsing to distinguish if statements with and without else; and infrastructure improvements to support larger-scale testing with depot runners.

November 2025 (semgrep/semgrep) focused on stability, profiling, and reliability to drive business value through faster builds, deeper performance insights, and more robust CI. Key features delivered include dependency cleanup and build stability improvements (removing unused dependencies such as ppx_trace and ppx_expect; documenting ppxlib compatibility and upgrade requirements; stabilizing Nix/LLVM/build configurations). Profiling support integration with Pyro-Caml: added pyro-caml as a dependency and integrated it into semgrep-core and the CLI with a --profile flag and Dockerfile adjustments to enable low-overhead, user-space profiling. Deterministic testing and improved error visibility for secrets validation to reduce CI flakiness and improve debugging. Major reliability work includes OpenTelemetry tracing stability fixes via dependency vendoring to stabilize mutex behavior in canary runs, OCaml object system mutex safety enhancements, and a thread-safety rule for lazy usage in OCaml.

Concise monthly summary for 2025-10 focusing on business value and technical achievements for semgrep/semgrep. Delivered features and stability enhancements across CI/CD, runtime concurrency, and dependency management, with strong emphasis on reliability, performance, and developer productivity.

September 2025 Monthly Summary for semgrep-interfaces: Stabilized backward compatibility for the Language Schema to support older CLI versions and data from older Semgrep releases. Delivered a bug fix that reverts a recent change by making the languages field accept either a string or an enum, ensuring seamless data consumption across versions. No new user-facing features; the work focused on reliability and compatibility.

August 2025 Monthly Summary for semgrep/semgrep focused on delivering performance insights, robust observability, and compatibility improvements that directly enhance reliability, developer productivity, and product quality.

July 2025 monthly summary for semgrep-interfaces: Delivered merge-base calculation support for diff scans by extending the configuration and metadata models. Specifically, added project_merge_base to scan_configuration and base_branch_head_commit to project_metadata to enable the application to determine the merge base for diff scans. This work is implemented via commit 3ce3539b8d9e46b98cf73d08f0b44ef63c3e80a0 (feat: pass info for app to decide merge base; PR #392). Major bugs fixed: none recorded for this repository in July 2025 based on the available data. The feature enhances diff-analysis accuracy, reduces ambiguity in cross-branch scan results, and lays groundwork for more reliable, scalable scanning. Technologies demonstrated: configuration/schema extension, data-model augmentation, and cross-repo traceability with explicit commit/PR references.

June 2025 monthly summary for semgrep/semgrep. Delivered a comprehensive OpenTelemetry-based tracing and telemetry overhaul, standardizing terminology, renaming and restructuring telemetry modules, and improving error tracking with server-span classification. Replaced legacy tracing with OTEL-only tracing, enabled recording of exceptions, and integrated parmap tracing under OTEL to enhance debugging visibility while removing unused trace_data_only to simplify the codebase and mitigate Datadog issues. Introduced the OpenTelemetry metrics framework, added scan input metrics, timeout metrics, and refined metric aggregation to improve operational visibility and data-driven decisions for performance and security rules. Performed changelog and release notes maintenance to ensure accurate patch/release entries and updated the build/dependency chain (Homebrew macOS base to v0.17.3) to improve cross-environment stability. Overall, these efforts increased reliability, reduced incident dwell time, and provided actionable telemetry that supports proactive performance tuning and faster issue resolution.

May 2025 Summary for semgrep/semgrep: Key features delivered - SMS Docker image promotion during canary releases and automated build of SMS image on develop, enabling faster, safer phased rollouts. Related commits include 2c04875f8b0897ba6f13dddf6fedd027b649279e and 0c61699fcfdeeb21e178b63cbbaae390c86de0c4. - OpenTelemetry data enrichment with VCS metadata (commit SHA and branch) to improve correlation between builds, traces, and debugging. Commit: bc0af0c79dad617fcaf6cf323f0f3681e9e2dd40. Major bugs fixed - Telemetry logging tag creation bug fixed to restore accurate log reporting. Commit: 74bc8c39e211c51b42c85bfaf43d0a49ecb6beb2. - OpenTelemetry tracing error handling and cleanup improvements to ensure spans are recorded during errors and to enhance shutdown robustness. Commits: ad01cd1be489f25fa668afe4cfc45009c3cbbead, 1537af9f4b638e80713e14b589fb551afa7bea7f. Overall impact and accomplishments - Streamlined release workflow with automated SMS image builds and canary promotion, accelerating time-to-release and reducing manual ops. - Strengthened observability by linking telemetry to VCS metadata, improving root-cause analysis and debugging efficiency. - Increased system reliability through robust error handling in tracing and safer shutdown processes. Technologies/skills demonstrated - Docker image pipelines, CI automation, and canary-release workflow - OpenTelemetry instrumentation and data enrichment - Logs/trace integrity fixes and exception-driven error handling - Backend cleanup and resilience improvements Business value - Faster, safer release cycles with measurable improvements in deployment confidence, debugging speed, and telemetry reliability.

April 2025: Delivered major packaging, CI/CD, and release-management enhancements for semgrep/semgrep, with critical workflows now centralized in the Pro repository to improve security, reproducibility, and release velocity. Key changes spanned Docker, Python packaging, wheels, and OSS release pipelines, supported by targeted CI infra improvements and release governance. Highlights by area: - Docker and Pro-repo release workflow: Refactored image tagging and enabled releasing Docker images from the Pro repository, enabling streamlined, auditable releases. - PyPI publishing relocation: Moved PyPI publishing to the Pro repo and consolidated the publish/release workflow with cleanup tasks for a cleaner, more reliable publish cycle. - OSS wheels and artifact mgmt: Built and published Linux/macOS wheels and OSS Windows wheels with refactored wheel build steps to simplify maintenance and improve artifact availability. - CI infra and build stability: Updated Ubuntu runner image, refactored docker.libsonnet/build_args, added OSS docker builds, and included docker-based CLI tests to strengthen CI reliability. - Release workflow governance: Implemented patch-aware release behavior, skip OSS releases on patch releases, and added housekeeping like pushing benchmark bins on release branches; required OSS synchronization before release starts to ensure assets are aligned. - Naming and release hygiene: Branding/name consistency changes and release-tagging fixes to improve traceability and compliance.

Month 2025-03 – Focused on modernizing the OCaml build system in semgrep-interfaces to improve reproducibility, onboarding, and maintainability. Delivered Build System Modernization by switching OCaml dependencies from the previous dev.opam setup to a centralized semgrep-interfaces.opam, refactoring the Makefile and setup target, and consolidating OCaml dependencies and external tooling under opam. The change is captured in a single commit: dee4b8b389fcdcb9b11c82ac4394e3c995822da1 ("chore: use opam to simplify makefile (#361)"). No additional features or bug fixes were recorded for this month in semgrep-interfaces. Overall impact: simplifies builds, improves reproducibility across environments, and lays the groundwork for future OCaml tooling convergence within the project.

February 2025 monthly summary for semgrep/semgrep: Focused on stabilizing CI/CD pipelines across multiple platforms, improving the development environment with Nix, and hardening Windows CI reliability and test stability. Achieved cross-platform build determinism, streamlined developer onboarding, and stronger build integrity through vendored dependencies and libcurl consistency. Overall impact: more reliable pipelines, faster PR throughput, and higher confidence in releases across Linux, macOS, and Windows.

January 2025 monthly summary for semgrep/semgrep focusing on business value and technical achievements. Key outcomes include faster, more reliable builds; improved upload stability; and a more robust release process, underpinned by modernized Nix tooling and careful bug fixes.

December 2024: OpenTelemetry Telemetry Data Enrichment and Organization delivered for semgrep/semgrep, enabling metrics to be grouped by scan and attaching deployment information to all traces and logs. This enhances visibility, correlation, and analysis in Grafana dashboards and downstream telemetry pipelines, enabling faster incident response and deployment-level insights.

November 2024 monthly summary for semgrep/semgrep focusing on observability improvements and CI automation. Delivered end-to-end telemetry pipelines using Datadog and OpenTelemetry, ensured spans flush on exit, aligned tracing environment defaults, and improved error grouping. Hardened tracing initialization to be idempotent and disabled telemetry in GC alarms to reduce noise. Automated weekly Nix flake updates and CI adjustments to keep dependencies current and reduce manual maintenance. Overall, these changes strengthen incident response, improve developer productivity, and lower operational risk across the repository.

Month: 2024-10 — Focused on stabilizing tracing observability and CI reliability for semgrep/semgrep. Key features delivered: 1) Tracing stability: fixed crashes when --trace is enabled due to OpenTelemetry resource aggregation/type checks; 2) CI workflow stabilization: temporarily disable test-osemgrep in GitHub Actions to stabilize builds. These changes reduced CI flakiness, improved feedback loops, and enhanced observability stability. Overall impact: increased production stability, faster PR validation, and safer rollout of tracing features. Technologies/skills demonstrated: OpenTelemetry tracing, crash debugging, CI/CD management in GitHub Actions, and regression testing discipline.