feat(observability): add local grafana+prom stack for metrics insights

observability/prometheus/prometheus.yml

@@ -0,0 +1,17 @@
+global:
+  scrape_interval: 15s
+
+# A scrape configuration containing exactly one endpoint to scrape.
+scrape_configs:
+  - job_name: "listory"
+    metrics_path: "/metrics"
+    static_configs:
+      - targets: ["api:9464"]
+
+  - job_name: "prometheus"
+    static_configs:
+      - targets: ["localhost:9090"]
+
+  - job_name: "tempo"
+    static_configs:
+      - targets: ["tempo:3100"]