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Replace transmission-exporter with homegrown Python exporter (#283)
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## Summary
- Replace unmaintained `metalmatze/transmission-exporter:master` sidecar with a homegrown Python exporter
- Uses `prometheus_client` + `transmission-rpc` with collect-on-scrape pattern (fresh metrics per scrape, no stale labels)
- Same metric names so existing Grafana Transmission dashboard works unchanged
- Container built with `uv` for dependency management, follows `grafana-sidecar` Dockerfile pattern

## Changes
- **New:** `containers/transmission-exporter/exporter.py` — single-file exporter (~130 lines)
- **New:** `containers/transmission-exporter/Dockerfile` — multi-stage Alpine build with uv
- **Modified:** `argocd/manifests/torrent/deployment.yaml` — swap sidecar image reference
- **Modified:** `argocd/manifests/torrent/kustomization.yaml` — add image tag entry
- **Modified:** `service-versions.yaml` — add transmission-exporter entry

## Deployment and Testing
- [ ] Build container: `mise run container-build-and-release transmission-exporter`
- [ ] Update kustomization.yaml newTag with build SHA
- [ ] Branch deploy: `argocd app set torrent --revision feature/transmission-exporter-python && argocd app sync torrent`
- [ ] Verify metrics: `kubectl -n torrent --context=minikube-indri port-forward svc/transmission 19091:19091` then `curl localhost:19091/metrics | grep transmission_`
- [ ] Verify Grafana Transmission dashboard panels populate
- [ ] After merge: `argocd app set torrent --revision main && argocd app sync torrent`

Reviewed-on: #283
This commit is contained in:
Erich Blume 2026-03-04 21:55:00 -08:00
commit f2704b26da
6 changed files with 182 additions and 1 deletions
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# Transmission Prometheus exporter - collect-on-scrape, no polling loop
# uv run --script handles dependency resolution at runtime
ARG CONTAINER_APP_VERSION=1.0.0
FROM python:3.13-alpine3.23
LABEL org.opencontainers.image.title="Transmission Exporter"
LABEL org.opencontainers.image.description="Prometheus exporter for Transmission BitTorrent client"
COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv
ENV PYTHONUNBUFFERED=1
ENV UV_CACHE_DIR=/tmp/uv-cache
WORKDIR /app
COPY exporter.py .
EXPOSE 19091
USER 65534:65534
CMD ["uv", "run", "--script", "/app/exporter.py"]