Add metrics for prune messages (#1981)

src/cluster_info.rs

@@ -17,6 +17,7 @@ use bloom::Bloom;
 use contact_info::ContactInfo;
 use counter::Counter;
 use crds_gossip::CrdsGossip;
+use crds_gossip_error::CrdsGossipError;
 use crds_gossip_pull::CRDS_GOSSIP_PULL_CRDS_TIMEOUT_MS;
 use crds_value::{CrdsValue, CrdsValueLabel, LeaderId};
 use ledger::LedgerWindow;
@@ -898,16 +899,22 @@ impl ClusterInfo {
                 if data.verify() {
                     inc_new_counter_info!("cluster_info-prune_message", 1);
                     inc_new_counter_info!("cluster_info-prune_message-size", data.prunes.len());
-                    me.write()
+                    match me.write().unwrap().gossip.process_prune_msg(
-                        .unwrap()
-                        .gossip
-                        .process_prune_msg(
                         from,
                         data.destination,
                         &data.prunes,
                         data.wallclock,
                         timestamp(),
-                        ).ok();
+                    ) {
+                        Err(CrdsGossipError::PruneMessageTimeout) => {
+                            inc_new_counter_info!("cluster_info-prune_message_timeout", 1)
+                        }
+                        Err(CrdsGossipError::BadPruneDestination) => {
+                            inc_new_counter_info!("cluster_info-bad_prune_destination", 1)
+                        }
+                        Err(_) => (),
+                        Ok(_) => (),
+                    }
                 }
                 vec![]
             }