fix: allow null status_code in ingest schema; check HTTP status in post_result

apps/monitor/src/runner.rs

@@ -342,7 +342,7 @@ async fn post_result(
     token: &str,
     result: PingResult,
 ) -> Result<()> {
-    tokio::time::timeout(
+    let resp = tokio::time::timeout(
         std::time::Duration::from_secs(10),
         client
             .post(format!("{coordinator_url}/internal/ingest"))
@@ -352,5 +352,11 @@ async fn post_result(
     ).await
         .map_err(|_| anyhow::anyhow!("post_result timed out"))?
         .map_err(|e| anyhow::anyhow!("{e}"))?;
+
+    if !resp.status().is_success() {
+        let status = resp.status();
+        let body = resp.text().await.unwrap_or_default();
+        return Err(anyhow::anyhow!("ingest returned {status}: {body}"));
+    }
     Ok(())
 }