fix(observability): suppress VOYAGE_API_KEY not configured Sentry noise (#2912)

src/core/observability.rs

@@ -284,6 +284,13 @@ pub fn expected_error_kind(message: &str) -> Option<ExpectedErrorKind> {
     if lower.contains("local ai is disabled") {
         return Some(ExpectedErrorKind::LocalAiDisabled);
     }
+    // `_api_key is not configured` catches backend-reported environment variable
+    // phrases like `VOYAGE_API_KEY is not configured` and
+    // `COHERE_API_KEY is not configured` returned by the embeddings backend
+    // when the relevant env var is absent (TAURI-RUST-2H5, ~5 K events).
+    // The `_api_key` anchor (lower-cased suffix of an env-var name) keeps
+    // generic "X is not configured" prose from being silenced — only
+    // ALL_CAPS_API_KEY-style names match.
     if lower.contains("api key not set")
         || lower.contains("missing api key")
         || lower.contains("_api_key is not configured")
@@ -2004,6 +2011,11 @@ mod tests {
 
     #[test]
     fn classifies_backend_env_api_key_not_configured() {
+        // TAURI-RUST-2H5 (~5 K events): backend embedding endpoint returns a
+        // 400 with `{"success":false,"error":"VOYAGE_API_KEY is not configured"}`
+        // whenever the backend env var is absent. This is a known server-side
+        // config state, not an app error — silence it the same way we silence
+        // other `ApiKeyMissing` variants.
         for raw in [
             r#"Embedding API error (400 Bad Request): {"success":false,"error":"VOYAGE_API_KEY is not configured"}"#,
             r#"Embedding API error 400 Bad Request: {"success":false,"error":"VOYAGE_API_KEY is not configured"}"#,
@@ -2027,6 +2039,10 @@ mod tests {
             expected_error_kind("workspace path is not configured for this user"),
             None
         );
+        assert_eq!(
+            expected_error_kind("embedding model is not configured"),
+            None
+        );
         assert_eq!(
             expected_error_kind("provider 'voyage' is not configured in settings"),
             None