log line every power of 10 to avoid spamming

crates/corro-agent/src/agent/handlers.rs

@@ -747,6 +747,7 @@ pub async fn handle_changes(
     const KEEP_SEEN_CACHE_SIZE: usize = 1000;
     let mut seen: IndexMap<_, RangeInclusiveSet<CrsqlSeq>> = IndexMap::new();
 
+    let mut drop_log_count: u64 = 0;
     // complicated loop to process changes efficiently w/ a max concurrency
     // and a minimum chunk size for bigger and faster SQLite transactions
     loop {
@@ -864,10 +865,21 @@ pub async fn handle_changes(
 
         // drop items when the queue is full.
         if queue.len() > max_queue_len {
-            warn!(
-                "dropping changes from {} because changes queue is full",
-                change.actor_id
-            );
+            drop_log_count += 1;
+            if is_pow_10(drop_log_count) {
+                if drop_log_count == 1 {
+                    warn!("dropping a change because changes queue is full");
+                } else {
+                    warn!(
+                        "dropping {} changes because changes queue is full",
+                        drop_log_count
+                    );
+                }
+            }
+            // reset count
+            if drop_log_count == 100000000 {
+                drop_log_count = 0;
+            }
             continue;
         }
 
@@ -1152,3 +1164,11 @@ mod tests {
         Ok(())
     }
 }
+
+#[inline]
+fn is_pow_10(i: u64) -> bool {
+    matches!(
+        i,
+        1 | 10 | 100 | 1000 | 10000 | 1000000 | 10000000 | 100000000
+    )
+}