Correctly initialize [server].bind & [metrics].bind

Fixes #10.

Signed-off-by: Gergely Nagy <me@gergo.csillger.hu>

CHANGELOG.md

@@ -12,6 +12,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 - Implemented a new metric, `iocaine_maze_depth`, a counter to track how deep the maze has been explored so far.
 - When metrics are enabled, process metrics such as CPU seconds used, memory usage, etc, are also emitted.
 
+### Fixed
+
+- The default bind address, both for the main service, and for metrics, are now correctly initialized with a default.
+
 ## [1.0.0] - 2025-03-01
 
 _Initial release._

src/config.rs

@@ -19,13 +19,13 @@ pub struct Config {
     pub metrics: MetricsConfig,
 }
 
-#[derive(Clone, Debug, Deserialize, Default)]
+#[derive(Clone, Debug, Deserialize)]
 pub struct ServerConfig {
     #[serde(default = "ServerConfig::default_bind")]
     pub bind: String,
 }
 
-#[derive(Clone, Debug, Deserialize, Default)]
+#[derive(Clone, Debug, Deserialize)]
 pub struct MetricsConfig {
     #[serde(default)]
     pub enable: bool,
@@ -43,6 +43,17 @@ impl MetricsConfig {
     }
 }
 
+impl Default for MetricsConfig {
+    fn default() -> Self {
+        Self {
+            enable: Default::default(),
+            labels: Default::default(),
+            bind: Self::default_bind(),
+            agent_group: Default::default(),
+        }
+    }
+}
+
 #[derive(Clone, Debug, Deserialize, PartialEq)]
 pub enum MetricsLabel {
     Host,
@@ -63,6 +74,14 @@ impl ServerConfig {
     }
 }
 
+impl Default for ServerConfig {
+    fn default() -> Self {
+        Self {
+            bind: Self::default_bind(),
+        }
+    }
+}
+
 #[derive(Clone, Debug, Deserialize)]
 pub struct SourceConfig {
     pub markov: Vec<String>,