
Jeroen contributed to several Grafana and Prometheus repositories, focusing on backend development, configuration, and workflow automation. He enhanced alerting in prometheus/node_exporter by introducing configurable time windows, allowing users to fine-tune filesystem and inode alerts. In grafana/crossplane-provider-grafana, he upgraded the Terraform provider and refactored credential handling for improved security using Go and Terraform. Jeroen also streamlined CI/CD pipelines in grafana/shared-workflows with a GitHub Actions integration for Jrsonnet CLI caching. His work in Backstage cataloging improved metadata management and discoverability, while stability fixes in grafana/cloudcost-exporter ensured reliable AWS RDS data collection. His contributions demonstrated technical depth and maintainability.
December 2025 (2025-12) monthly summary for grafana/cloudcost-exporter: Focused on reliability and data quality in RDS data collection. The primary work this month was a stability improvement addressing a recurring data collection failure scenario. No new features were released; instead, robustness enhancements were implemented to ensure consistent cost reporting even when some RDS instances lack an Availability Zone.
December 2025 (2025-12) monthly summary for grafana/cloudcost-exporter: Focused on reliability and data quality in RDS data collection. The primary work this month was a stability improvement addressing a recurring data collection failure scenario. No new features were released; instead, robustness enhancements were implemented to ensure consistent cost reporting even when some RDS instances lack an Availability Zone.
Sep 2025 monthly summary focusing on Backstage catalog work and metadata enhancements across two Grafana repositories. Delivered concrete enhancements to tooling discovery, ownership, and governance with minimal disruption to ongoing work; prepared groundwork for broader adoption and improved cross-team collaboration.
Sep 2025 monthly summary focusing on Backstage catalog work and metadata enhancements across two Grafana repositories. Delivered concrete enhancements to tooling discovery, ownership, and governance with minimal disruption to ongoing work; prepared groundwork for broader adoption and improved cross-team collaboration.
June 2025 monthly summary for grafana/grafana focused on stabilizing and clarifying Grafonnet usage for programmatic Grafana dashboard generation. Key outcome: removal of the Grafonnet deprecation notice, confirming it remains a viable option for generating Grafana dashboard JSON definitions. This reduces developer confusion, preserves automation capabilities, and aligns with ongoing maintenance and documentation efforts.
June 2025 monthly summary for grafana/grafana focused on stabilizing and clarifying Grafonnet usage for programmatic Grafana dashboard generation. Key outcome: removal of the Grafonnet deprecation notice, confirming it remains a viable option for generating Grafana dashboard JSON definitions. This reduces developer confusion, preserves automation capabilities, and aligns with ongoing maintenance and documentation efforts.
Month: 2024-12 — grafana/shared-workflows monthly summary focusing on key outcomes and deliverables.
Month: 2024-12 — grafana/shared-workflows monthly summary focusing on key outcomes and deliverables.
For 2024-10, delivered a security-focused upgrade of Grafana Terraform provider to v3.11.0 in grafana/crossplane-provider-grafana, along with essential repository hygiene. Updated Go and golangci-lint to current versions; tightened golangci-lint configuration with targeted suppressions and a 5-minute timeout. Refactored sensitive credentials (passwords and bearer tokens) to secret references, reducing exposure and improving security posture. These changes enhance security, maintainability, and alignment with platform standards, while reducing technical debt and enabling smoother future releases.
For 2024-10, delivered a security-focused upgrade of Grafana Terraform provider to v3.11.0 in grafana/crossplane-provider-grafana, along with essential repository hygiene. Updated Go and golangci-lint to current versions; tightened golangci-lint configuration with targeted suppressions and a 5-minute timeout. Refactored sensitive credentials (passwords and bearer tokens) to secret references, reducing exposure and improving security posture. These changes enhance security, maintainability, and alignment with platform standards, while reducing technical debt and enabling smoother future releases.
September 2022 monthly summary for prometheus/node_exporter: Focused on delivering configurable alert time windows to improve predictability for filesystem space and inode-related alerts. Feature delivery enables users to set custom warning/critical windows, reducing alert flapping and aiding capacity planning. Documentation was updated to reflect the new option (node(Warning|Critical)WindowHours) in the node-mixin, supported by a dedicated docs commit. No major code bugs fixed this month; emphasis was on feature enablement, documentation accuracy, and release-readiness.
September 2022 monthly summary for prometheus/node_exporter: Focused on delivering configurable alert time windows to improve predictability for filesystem space and inode-related alerts. Feature delivery enables users to set custom warning/critical windows, reducing alert flapping and aiding capacity planning. Documentation was updated to reflect the new option (node(Warning|Critical)WindowHours) in the node-mixin, supported by a dedicated docs commit. No major code bugs fixed this month; emphasis was on feature enablement, documentation accuracy, and release-readiness.

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