almost ready

monitoring/prometheus/prometheus.service

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+# Prometheus is not in the Grafana apt repo, so install.sh drops the release binary into
+# /opt/prometheus and installs this unit. Flags: remote-write + OTLP receivers ON (Alloy and
+# Tempo push to it), 15-day local retention.
+[Unit]
+Description=Prometheus
+Documentation=https://prometheus.io/docs/
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+User=prometheus
+Group=prometheus
+Type=simple
+Restart=on-failure
+RestartSec=5
+ExecStart=/opt/prometheus/prometheus \
+  --config.file=/etc/prometheus/prometheus.yml \
+  --storage.tsdb.path=/var/lib/prometheus \
+  --storage.tsdb.retention.time=15d \
+  --web.enable-remote-write-receiver \
+  --web.enable-otlp-receiver \
+  --web.listen-address=0.0.0.0:9090
+
+[Install]
+WantedBy=multi-user.target