fix: change log level when we can't get the schema from GCP

NEXT_CHANGELOG.md

@@ -42,6 +42,13 @@ It defaults to 30 seconds.
 By [@o0Ignition0o](https://github.com/o0Ignition0o) in https://github.com/apollographql/router/pull/2271
 
 ## 🐛 Fixes
+
+### Change log level when we can't get the schema from GCP ([Issue #2004](https://github.com/apollographql/router/issues/2004))
+
+Set the log level for this specific log to `debug`.
+
+By [@bnjjj](https://github.com/bnjjj) in https://github.com/apollographql/router/pull/2215
+
 ### Traces won't cause missing field-stats ([Issue #2267](https://github.com/apollographql/router/issues/2267))
 
 Previously if a request was sampled for tracing it was not contributing to metrics correctly. This was a particular problem for users with a high sampling rate.

apollo-router/src/uplink/mod.rs

@@ -64,7 +64,9 @@ pub(crate) fn stream_supergraph(
         let mut current_url_idx = 0;
 
         loop {
+            let mut nb_errors = 0usize;
             match fetch_supergraph(
+                &mut nb_errors,
                 api_key.to_string(),
                 graph_ref.to_string(),
                 composition_id.clone(),
@@ -122,7 +124,6 @@ pub(crate) fn stream_supergraph(
                     }
                 },
                 Err(err) => {
-                    tracing::error!("error fetching supergraph from Uplink: {:?}", err);
                     if let Some(urls) = &urls {
                         current_url_idx = (current_url_idx + 1) % urls.len();
                     }
@@ -139,6 +140,7 @@ pub(crate) fn stream_supergraph(
 }
 
 pub(crate) async fn fetch_supergraph(
+    nb_errors: &mut usize,
     api_key: String,
     graph_ref: String,
     composition_id: Option<String>,
@@ -155,9 +157,20 @@ pub(crate) async fn fetch_supergraph(
     let response = match url {
         Some(url) => http_request(url.as_str(), &request_body, timeout).await?,
         None => match http_request(GCP_URL, &request_body, timeout).await {
-            Ok(response) => response,
+            Ok(response) => {
+                if *nb_errors > 0 {
+                    *nb_errors = 0;
+                    tracing::info!("successfully retrieved the schema from GCP");
+                }
+                response
+            }
             Err(e) => {
-                tracing::error!("could not get schema from GCP, trying AWS: {:?}", e);
+                if *nb_errors == 3 {
+                    tracing::error!("could not get schema from GCP, trying AWS: {:?}", e);
+                } else {
+                    tracing::debug!("could not get schema from GCP, trying AWS: {:?}", e);
+                }
+                *nb_errors += 1;
                 http_request(AWS_URL, &request_body, timeout).await?
             }
         },