feat: init

etcd/types.rs

@@ -0,0 +1,10 @@
+use std::collections::HashMap;
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ServiceInstance {
+    pub addr: String,
+    #[serde(default)]
+    pub metadata: HashMap<String, String>,
+}