[sui-edge-proxy] add filters for certain reqs we aren't interested in (…

…#20908)

## Description 

the new logging feature was including a lot of requests we're not
interested in

---

## Release notes

Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.

For each box you select, include information after the relevant heading
that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [ ] gRPC:
- [ ] JSON-RPC: 
- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK:

crates/sui-edge-proxy/src/handlers.rs

@@ -115,6 +115,31 @@ async fn proxy_request(
         body_bytes.len(),
         peer_type
     );
+    if matches!(peer_type, PeerRole::Read) {
+        let user_agent = parts
+            .headers
+            .get("user-agent")
+            .and_then(|h| h.to_str().ok());
+        let is_health_check = matches!(user_agent, Some(ua) if ua.contains("GoogleHC/1.0"));
+        let is_grafana_agent = matches!(user_agent, Some(ua) if ua.contains("GrafanaAgent"));
+        let is_grpc = parts
+            .headers
+            .get("content-type")
+            .and_then(|h| h.to_str().ok())
+            .map(|ct| ct.contains("grpc"))
+            .unwrap_or(false);
+
+        let should_sample = !is_health_check && !is_grafana_agent && !is_grpc;
+        let rate = state.logging_config.read_request_sample_rate;
+        if should_sample && rand::thread_rng().gen::<f64>() < rate {
+            tracing::info!(
+                headers = ?parts.headers,
+                body = ?body_bytes,
+                peer_type = ?peer_type,
+                "Sampled read request"
+            );
+        }
+    }
 
     let metrics = &state.metrics;
     let peer_type_str = peer_type.as_str();
@@ -210,16 +235,5 @@ async fn proxy_request(
         }
     }
 
-    if matches!(peer_type, PeerRole::Read) {
-        let rate = state.logging_config.read_request_sample_rate;
-        if rand::thread_rng().gen::<f64>() < rate {
-            tracing::info!(
-                headers = ?parts.headers,
-                body = ?body_bytes,
-                peer_type = ?peer_type,
-                "Sampled read request"
-            );
-        }
-    }
     Ok(resp)
 }