Logging: peer table refresh (#4391)

changed some log messages

Signed-off-by: Sally MacFarlane <macfarla.github@gmail.com>
Co-authored-by: Simon Dudley <simon.dudley@consensys.net>

ethereum/p2p/src/main/java/org/hyperledger/besu/ethereum/p2p/discovery/internal/PeerDiscoveryController.java

@@ -436,10 +436,10 @@ public class PeerDiscoveryController {
   private void refreshTableIfRequired() {
     final long now = System.currentTimeMillis();
     if (lastRefreshTime + tableRefreshIntervalMs <= now) {
-      LOG.debug("Peer table refresh triggered by timer expiry");
+      LOG.debug("Refreshing peer table after {} ms", tableRefreshIntervalMs);
       refreshTable();
     } else if (!peerRequirement.hasSufficientPeers()) {
-      LOG.debug("Peer table refresh triggered by insufficient peers");
+      LOG.debug("Refreshing peer table: seeking more peers. peer count < max");
       refreshTable();
     }
   }

ethereum/p2p/src/main/java/org/hyperledger/besu/ethereum/p2p/discovery/internal/RecursivePeerRefreshState.java

@@ -191,7 +191,10 @@ public class RecursivePeerRefreshState {
     if (metadataPeer == null) {
       return;
     }
-    LOG.debug("Received neighbours packet with {} neighbours", peers.size());
+    LOG.debug(
+        "Received neighbours packet with {} neighbours from {}",
+        peers.size(),
+        peer.getEnodeURLString());
     for (final DiscoveryPeer receivedDiscoPeer : peers) {
       if (satisfiesMapAdditionCriteria(receivedDiscoPeer)) {
         final MetadataPeer receivedMetadataPeer =