GreenKube v0.2.12

What's Changed

Added

• Auth-proxy routing (#245): TRUST_AUTH_PROXY config flag enables forwarding authenticated requests through an external auth proxy (Authentik, Caddy). When enabled, the API reads the authenticated user identity from the X-Forwarded-User / X-Auth-Request-User headers instead of performing its own authentication, removing the need to expose credentials directly to the proxy. Special thanks to @kahnwong for the detailed reproduction information that led to this fix.
• Structured logging with structlog: A new LOG_FORMAT config option (json or text, default text) controls the log output format. JSON mode emits machine-readable structured log lines suitable for log aggregation pipelines (e.g. Loki). Exposed in Helm values.yaml via config.logFormat.
• DB vacuuming and savings-ledger pruning: MetricsCompressor now runs VACUUM on the main metrics tables after each compaction cycle. A dedicated pruning pass removes stale hourly-savings-ledger records older than the configured retention window, keeping storage usage bounded on long-running deployments.
• Metrics: DB-level pagination for GET /api/v1/metrics — The endpoint now uses SQL COUNT(*) + LIMIT/OFFSET instead of loading the full result set into Python. A new METRICS_LIST_MAX_RANGE_DAYS config (default 30, exposed in Helm values.yaml via config.metricsListMaxRangeDays) rejects requests wider than the limit with HTTP 400 to prevent accidental OOM on large clusters.
• Repository: read_combined_metrics_page — New method on CombinedMetricsRepository (base Python fallback + optimised PostgreSQL UNION ALL implementation) for DB-level paginated reads.
• Repository: read_latest_per_pod — New method returning the single most-recent metric snapshot for each (namespace, pod_name) pair. PostgreSQL implementation uses DISTINCT ON for efficiency; base class falls back to Python deduplication.
• Repository: aggregate_grouped_row_count — New method returning the number of distinct (group_key × time_bucket) rows a grouped-aggregate export would produce, computed entirely in SQL (COUNT DISTINCT). Implemented for PostgreSQL and SQLite.
• Metrics endpoint: Prometheus gauge refresh via read_latest_per_pod — refresh_metrics_from_db now calls read_latest_per_pod instead of loading the full metrics history and deduplicating in Python, eliminating a major OOM source for large clusters.

Changed

• Toolchain: switched from pip to uv — All CI workflows, the Dockerfile, and developer documentation now use uv for dependency management and virtual-environment creation. A uv.lock lockfile replaces the previous requirements*.txt files, ensuring fully reproducible builds across environments.
• Settings: replaced python-dotenv with pydantic-settings — config.py is now driven by pydantic-settings BaseSettings, giving automatic environment-variable parsing with type coercion, validation, and cleaner secret handling. python-dotenv removed from dependencies.
• Type checking: Pyrefly added to pre-commit — Pyrefly static type checker integrated into the pre-commit hook chain. Codebase cleaned up (dead code, redundant imports, incorrect annotations) as part of the initial Pyrefly pass.
• Frontend: metrics page removed — The /metrics route and its associated Svelte page have been removed. Dashboard panels reordered accordingly.

Fixed

• API: oversized response headers causing Caddy/Authentik 502/503 errors — Bloated debug and CORS headers removed from all API responses; the fix resolves upstream sent invalid header 50x errors seen behind reverse-proxy setups.
• Frontend: donut chart legend overflow — Namespaces beyond the top-N are now collapsed into an other slice, preventing the chart legend from overflowing the panel.
• Ruff version mismatch in CI — Pinned ruff version in CI to match the local configuration, eliminating lint-step failures caused by version skew.
• OOM (OOMKilled, exit code 137) in greenkube-api — GET /api/v1/metrics, GET /api/v1/report/summary?aggregate=true, and the Prometheus gauge refresh all previously loaded up to 1 M+ CombinedMetric objects into memory. All three paths are now SQL-backed and never materialise full row sets in Python (#239).
• report/summary?aggregate=true uses pure SQL — The aggregate summary path calls aggregate_grouped_row_count (SQL COUNT DISTINCT) instead of invoking aggregate_metrics() over loaded rows, making large date ranges safe regardless of dataset size.
• Memory leaks in Kubernetes API client — NodeCollector and PodCollector now explicitly close the async kubernetes_asyncio API client after each collection cycle, preventing handle leaks on long-running pods.
• Security: frontend dependency updates — package.json / package-lock.json updated to remediate Trivy-flagged vulnerabilities in transitive frontend dependencies.

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Docker: docker pull greenkube/greenkube:0.2.12

Helm:

helm repo add greenkube https://GreenKubeCloud.github.io/GreenKube
helm repo update
helm install greenkube greenkube/greenkube -n greenkube --create-namespace