70 lines
2.4 KiB
Markdown
70 lines
2.4 KiB
Markdown
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---
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title: Tempo
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modified: 2026-03-05
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tags:
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- service
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- observability
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---
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# Grafana Tempo
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Distributed tracing backend for BlumeOps infrastructure. Receives traces via OTLP, stores them locally, and generates RED metrics (rate, error, duration) for [[prometheus]].
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## Quick Reference
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| Property | Value |
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|----------|-------|
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| **URL** | https://tempo.ops.eblu.me (when Caddy route added) |
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| **Tailscale URL** | https://tempo.tail8d86e.ts.net |
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| **OTLP Endpoint** | https://tempo-otlp.tail8d86e.ts.net |
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| **Namespace** | `monitoring` |
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| **Image** | `grafana/tempo:2.10.1` |
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| **Storage** | 10Gi PVC (local filesystem) |
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| **Retention** | 7 days |
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## Architecture
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- Single-node deployment with local filesystem storage
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- OTLP receivers: gRPC (4317) and HTTP (4318)
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- `metrics_generator` produces span-metrics and service-graphs, remote-written to [[prometheus]]
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- Queried via [[grafana]] Tempo datasource
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- Two Tailscale Ingresses: one for query API (3200), one for OTLP HTTP receiver (4318)
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## Trace Sources
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**From ringtail (via Beyla eBPF in Alloy):**
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| Service | Protocol | Coverage |
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|---------|----------|----------|
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| [[frigate]] | HTTP REST | Request rate, error rate, latency, trace spans |
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| [[ntfy]] | HTTP | Same |
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| [[ollama]] | HTTP REST | Same (model inference latency) |
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| [[immich]] | HTTP REST | Same |
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Beyla auto-instruments HTTP services via eBPF kernel hooks — no code changes needed. MQTT (Mosquitto) is not instrumented (no eBPF parser for MQTT).
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**Future: SDK instrumentation**
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Services with OTel SDK support (e.g., Hermes) can send traces directly to the OTLP endpoint for deeper internal spans (DB queries, business logic) alongside eBPF envelope traces.
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## Storage Monitoring
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Tempo exposes `tempodb_backend_bytes_total` via its `/metrics` endpoint (scraped by [[prometheus]]). To check storage utilization against the 10Gi PVC:
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```promql
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tempodb_backend_bytes_total / 10737418240 * 100
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```
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Full PVC-level monitoring (via kubelet volume stats) is not yet available — see backlog.
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## Grafana Integration
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- **Tempo datasource** with trace-to-log and trace-to-metrics correlation
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- **Service map** and **node graph** visualization
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- **Loki derived fields** link trace IDs in logs back to Tempo
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## Related
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- [[alloy|Alloy]] - Trace collector (Beyla eBPF on ringtail)
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- [[prometheus]] - Receives span-metrics from Tempo
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- [[loki]] - Log correlation via trace IDs
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- [[grafana]] - Trace visualization
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