Add: Log message for config loading.

src/main.rs

@@ -36,16 +36,15 @@ fn resolve_host_or_ip(label: &str, value: &str) -> Option<IpAddr> {
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
     // Bootstrap configuration: prefer appsettings.json, otherwise rely on baked-in demo defaults.
-    let cfg = match Config::load_default() {
+    let (cfg, cfg_source) = match Config::load_default() {
-        Ok(c) => {
+        Ok(c) => (c, "appsettings.json".to_string()),
-            c
-        }
         Err(e) => {
             eprintln!(
                 "no appsettings.json found or failed to load: {} — using defaults",
                 e
             );
             // defaults
+            (
                 Config {
                     server: niom_turn::config::ServerOptions {
                         bind: "0.0.0.0:3478".to_string(),
@@ -66,7 +65,9 @@ async fn main() -> anyhow::Result<()> {
                     relay: niom_turn::config::RelayOptions::default(),
                     logging: niom_turn::config::LoggingOptions::default(),
                     limits: niom_turn::config::LimitsOptions::default(),
-            }
+                },
+                "defaults".to_string(),
+            )
         }
     };
 
@@ -81,6 +82,13 @@ async fn main() -> anyhow::Result<()> {
     let rate_limiters = Arc::new(RateLimiters::from_limits(&cfg.limits));
 
     info!("niom-turn starting");
+    info!("config source={} realm={} creds={} rest_secret={} tls_cert={}",
+        cfg_source,
+        cfg.auth.realm,
+        cfg.credentials.len(),
+        cfg.auth.rest_secret.is_some(),
+        cfg.server.tls_cert.is_some()
+    );
     info!("logging.default_directive={}", log_directive);
 
     let udp_bind = cfg