fix(gateway): reject enabled Datadog integration without a webhook block

Silently dropping a configured-but-webhook-less integration lets the gateway start with an operator-declared integration missing, so it must fail config resolution loudly instead.

Signed-off-by: Yordis Prieto <yordis.prieto@gmail.com>

Author: yordis

rsworkspace/crates/trogon-gateway/src/config.rs

@@ -1748,6 +1748,7 @@ fn resolve_datadog_integrations(
             continue;
         }
         let Some(webhook) = integration.webhook else {
+            errors.push(ConfigValidationError::missing_integration("datadog", &id, "webhook"));
             continue;
         };
         let Some(token) =

rsworkspace/crates/trogon-gateway/src/config/tests.rs

@@ -935,6 +935,19 @@ fn datadog_empty_webhook_token_is_invalid() {
     );
 }
 
+#[test]
+fn datadog_enabled_integration_without_webhook_block_is_invalid() {
+    let toml = r#"
+[sources.datadog.integrations.primary]
+subject_prefix = "datadog-primary"
+"#;
+    let f = write_toml(toml);
+    let result = load(Some(f.path()));
+    assert!(
+        matches!(result, Err(ConfigError::Validation(ref errs)) if errs.iter().any(|e| e.contains("datadog/primary: missing webhook")))
+    );
+}
+
 #[test]
 fn datadog_timestamp_tolerance_defaults_to_disabled() {
     let f = write_toml(&datadog_toml("datadog-webhook-token"));