
Kevin Leimkuhler enhanced the grafana/alloy repository by refactoring the Loki SecretFilter to use a Gitleaks-based secret detection approach, focusing on improved performance and maintainability. He implemented new redaction controls, such as redact_percent, while preserving essential configuration arguments and removing deprecated options to streamline user experience. The update included a comprehensive overhaul of metrics and observability, adding new metrics for redaction tracking and deprecating less useful ones. Kevin also updated documentation to guide users through breaking changes. His work leveraged Go and security engineering expertise, delivering faster secret scans, clearer operator behavior, and a foundation for future Gitleaks integration.
February 2026 (2026-02) monthly summary for grafana/alloy: Delivered Loki SecretFilter enhancement by migrating to a Gitleaks-based detector, delivering faster secret detection and easier maintenance. Implemented new redaction controls (redact_percent) while preserving essential arguments (forward_to, origin_label, gitleaks_config, redact_with); removed deprecated options to streamline usage. Updated metrics and observability to include secrets_redacted_total, secrets_redacted_by_rule_total, secrets_redacted_by_origin, and processing_duration_seconds; deprecated/removed metrics (secrets_allowlisted_total, secrets_skipped_entropy_by_rule_total) for clearer signal. Documentation updated with new arguments, metrics, and breaking-change guidance. BREAKING CHANGE: several config options removed (partial_mask, allowlist, enable_entropy, include_generic, types). Business value: improved security coverage, faster scans, reduced maintenance burden, and clearer operator behavior. Tech stack impact: Gitleaks integration in Loki SecretFilter, config refactor, observability instrumentation, and supporting docs.
February 2026 (2026-02) monthly summary for grafana/alloy: Delivered Loki SecretFilter enhancement by migrating to a Gitleaks-based detector, delivering faster secret detection and easier maintenance. Implemented new redaction controls (redact_percent) while preserving essential arguments (forward_to, origin_label, gitleaks_config, redact_with); removed deprecated options to streamline usage. Updated metrics and observability to include secrets_redacted_total, secrets_redacted_by_rule_total, secrets_redacted_by_origin, and processing_duration_seconds; deprecated/removed metrics (secrets_allowlisted_total, secrets_skipped_entropy_by_rule_total) for clearer signal. Documentation updated with new arguments, metrics, and breaking-change guidance. BREAKING CHANGE: several config options removed (partial_mask, allowlist, enable_entropy, include_generic, types). Business value: improved security coverage, faster scans, reduced maintenance burden, and clearer operator behavior. Tech stack impact: Gitleaks integration in Loki SecretFilter, config refactor, observability instrumentation, and supporting docs.

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