2025-06 Monthly Summary for sched-ext/scx. Delivered enhanced observability for Scheduler Queue Placement in scx_mitosis with global and per-cell queue metrics, enabling faster debugging and performance tuning. Implemented logging for queue placement decisions, with distributions across queue types and tracking affinity violations. Updated BPF code, headers, and the main Rust application to collect, compute, and display metrics. Committed changes to log global + per-cell queue counts (commit 5db364f954b86c83f08c50cdbccf86a4cea1018a). Business value: improved visibility reduces mean time to identify scheduling bottlenecks, accelerates optimization and reliability. Technologies demonstrated: Rust, BPF, kernel/user-space instrumentation, observability tooling, data aggregation and reporting. Major bugs fixed: none this month.

April 2025 (Month: 2025-04) - Key feature delivered: Introduced a new 'get' action for the 'ruleset' object in the bfcli front-end API to retrieve the current ruleset and associated counters from the daemon. This enables CLI-driven visibility into policy state and runtime metrics, supporting faster issue diagnosis and policy auditing. Major bugs fixed: No major bugs reported for this period in the bpfilter repository. Overall impact and accomplishments: Enhances operational visibility and control over runtime rulesets, reducing mean time to insight and improving reliability of policy enforcement. Demonstrates end-to-end API surface work, alignment with existing design patterns, and concrete progress toward observability goals. Technologies/skills demonstrated: Front-end API extension, client-server contract design, daemon/frontend integration, isolated changelist with a traceable commit, and code contributions in a living open-source project.