April 2026 monthly wrap-up for the prometheus/prometheus repository focused on Enhancing and hardening Prometheus service discovery metrics. Delivered a cleanup and enhancement of service discovery metrics to improve health visibility while reducing metric cardinality. Implemented removal of expired per-scrape-job refresh metrics when a scrape job config is deleted during reload, consolidating service discovery and refresh metrics for clearer health monitoring and lower cardinality. The change preserves generic service-discovery health signals while removing job-specific metrics that no longer reflect active configurations.

November 2025 monthly work summary focused on stabilizing AWS discovery and aligning service discovery APIs across engines to improve reliability and maintainability.

September 2025 focused on strengthening observability for HTTP Service Discovery in grafana/mimir-prometheus. Delivered a new config label ('config') to refresh metrics, enabling source-level identification and enhanced performance tracking across multiple HTTP SD sources. This change isolates metrics by source, improving root-cause analysis for refresh issues and performance regressions. Documentation updated to reference the new refresh metrics. No major bugs fixed this month. All changes captured in commit e894a22b88dabaa461fc30c686fe3f368d80dfad.