Monitoring: Alloy → Prometheus/Loki auf Selendis

Status: ✅ Vollständig deployed
Remote Storage: 10.0.0.3:9090 (Prometheus), 10.0.0.3:3100 (Loki)

Überblick

Alloy (Grafana Agent) sammelt Metriken & Logs vom K3S-Cluster und schickt sie zu Prometheus/Loki auf Selendis.

Komponenten

Komponente	Rolle
Alloy	Metrics & Logs Collector
kube-state-metrics	Kubernetes Object Status
node-exporter	Host Metrics (CPU, Memory, Disk)
Prometheus (Selendis)	Metrics Ingestion
Loki (Selendis)	Logs Ingestion

Dateien (in `apps/monitoring/`)

namespace.yaml
helm-repos.yaml (prometheus-community, grafana)
kube-state-metrics.yaml, node-exporter.yaml
alloy-config.yaml (River config with scrape targets + remote write)
alloy.yaml (HelmRelease)

Scrape Targets

Alloy scraped:

Flux Controllers (flux-system ns, port 8080)
kube-state-metrics (monitoring:8080)
node-exporter (monitoring:9100)
Synapse (matrix.axion1337.chat:9000)

Alle Remote Write zu 10.0.0.3:9090 (Prometheus) + 10.0.0.3:3100 (Loki).

Troubleshooting

# Check Alloy Logs
kubectl logs -n monitoring -l app.kubernetes.io/name=alloy

# Check Prometheus remote write
curl http://10.0.0.3:9090/api/v1/query?query=up

# Loki test
curl -s http://10.0.0.3:3100/loki/api/v1/query_range?query=%7B%7D | jq .

Weitere Details: Siehe Kapitel 3.