Trace Prometheus' metrics requests

src/metrics.rs

@@ -90,6 +90,7 @@ fn handle_request(
     prometheus::TextEncoder::new()
         .encode(&reg.gather(), &mut buffer)
         .unwrap();
+    trace!("metrics: {:?} -> {} bytes", request, buffer.len());
     let response = tiny_http::Response::from_data(buffer);
     request.respond(response)
 }

src/rest.rs

@@ -585,7 +585,10 @@ fn handle_request(
             };
             let proof = query.get_merkle_proof(&hash, &status.block_hash.unwrap())?;
             let ttl = ttl_by_depth(status.block_height, query);
-            json_response(json!({ "block_height": status.block_height, "merkle": proof.0, "pos": proof.1 }), ttl)
+            json_response(
+                json!({ "block_height": status.block_height, "merkle": proof.0, "pos": proof.1 }),
+                ttl,
+            )
         }
         (&Method::GET, Some(&"tx"), Some(hash), Some(&"outspend"), Some(index)) => {
             let hash = Sha256dHash::from_hex(hash)?;