feat(billing): implement tenant subscription entitlements system (milestones 0-6)

control/api/tests/observability_configs.rs

@@ -8,6 +8,20 @@ fn repo_root() -> PathBuf {
         .to_path_buf()
 }
 
+#[test]
+fn loki_and_tempo_s3_config_variants_are_syntactically_valid() {
+    let root = repo_root();
+
+    for file in [
+        root.join("observability/loki/config.s3.yml"),
+        root.join("observability/tempo/config.s3.yml"),
+    ] {
+        let raw = fs::read_to_string(&file).unwrap_or_else(|e| panic!("{file:?}: {e}"));
+        let _: serde_yaml::Value =
+            serde_yaml::from_str(&raw).unwrap_or_else(|e| panic!("{file:?}: {e}"));
+    }
+}
+
 #[test]
 fn grafana_provisioning_files_are_syntactically_valid() {
     let root = repo_root();