Avoid log spam about cluster node failure detection by each primary (#2010)

After node failure detection/recovery and gossip by each primary, we log
about the failure detection/recovery at NOTICE level which can spam the
server and the behavior is quite expensive on ec2 burstable instance
types. I would prefer us rolling it back to VERBOSE level.

Change was introduced in #633

Signed-off-by: Harkrishn Patro <[email protected]>

Author: hpatro

src/cluster_legacy.c

@@ -2410,13 +2410,13 @@ void clusterProcessGossipSection(clusterMsg *hdr, clusterLink *link) {
             if (sender) {
                 if (flags & (CLUSTER_NODE_FAIL | CLUSTER_NODE_PFAIL)) {
                     if (clusterNodeIsVotingPrimary(sender) && clusterNodeAddFailureReport(node, sender)) {
-                        serverLog(LL_NOTICE, "Node %.40s (%s) reported node %.40s (%s) as not reachable.", sender->name,
+                        serverLog(LL_VERBOSE, "Node %.40s (%s) reported node %.40s (%s) as not reachable.", sender->name,
                                   sender->human_nodename, node->name, node->human_nodename);
                     }
                     markNodeAsFailingIfNeeded(node);
                 } else {
                     if (clusterNodeDelFailureReport(node, sender)) {
-                        serverLog(LL_NOTICE, "Node %.40s (%s) reported node %.40s (%s) is back online.", sender->name,
+                        serverLog(LL_VERBOSE, "Node %.40s (%s) reported node %.40s (%s) is back online.", sender->name,
                                   sender->human_nodename, node->name, node->human_nodename);
                     }
                 }