Adjust the log level of some logs in the cluster

I think the log of pfail status changes will be very useful.
The other parts were scanned and found that it can be modified.

Signed-off-by: Binbin <binloveplay1314@qq.com>

src/cluster_legacy.c

@@ -1755,7 +1755,7 @@ void clusterHandleConfigEpochCollision(clusterNode *sender) {
     server.cluster->currentEpoch++;
     myself->configEpoch = server.cluster->currentEpoch;
     clusterSaveConfigOrDie(1);
-    serverLog(LL_VERBOSE,
+    serverLog(LL_WARNING,
               "WARNING: configEpoch collision with node %.40s (%s)."
               " configEpoch set to %llu",
               sender->name, sender->human_nodename, (unsigned long long)myself->configEpoch);
@@ -2094,13 +2094,13 @@ void clusterProcessGossipSection(clusterMsg *hdr, clusterLink *link) {
             if (sender && clusterNodeIsPrimary(sender)) {
                 if (flags & (CLUSTER_NODE_FAIL | CLUSTER_NODE_PFAIL)) {
                     if (clusterNodeAddFailureReport(node, sender)) {
-                        serverLog(LL_VERBOSE, "Node %.40s (%s) reported node %.40s (%s) as not reachable.",
+                        serverLog(LL_NOTICE, "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_VERBOSE, "Node %.40s (%s) reported node %.40s (%s) is back online.", sender->name,
+                        serverLog(LL_NOTICE, "Node %.40s (%s) reported node %.40s (%s) is back online.", sender->name,
                                   sender->human_nodename, node->name, node->human_nodename);
                     }
                 }
@@ -2971,7 +2971,7 @@ int clusterProcessPacket(clusterLink *link) {
                 /* If the reply has a non matching node ID we
                  * disconnect this node and set it as not having an associated
                  * address. */
-                serverLog(LL_DEBUG,
+                serverLog(LL_WARNING,
                           "PONG contains mismatching sender ID. About node %.40s (%s) in shard %.40s added %d ms ago, "
                           "having flags %d",
                           link->node->name, link->node->human_nodename, link->node->shard_id,
@@ -3196,7 +3196,7 @@ int clusterProcessPacket(clusterLink *link) {
                 if (bitmapTestBit(hdr->myslots, j)) {
                     if (server.cluster->slots[j] == sender || isSlotUnclaimed(j)) continue;
                     if (server.cluster->slots[j]->configEpoch > senderConfigEpoch) {
-                        serverLog(LL_VERBOSE,
+                        serverLog(LL_NOTICE,
                                   "Node %.40s has old slots configuration, sending "
                                   "an UPDATE message about %.40s",
                                   sender->name, server.cluster->slots[j]->name);
@@ -4782,7 +4782,7 @@ void clusterCron(void) {
                 if (clusterNodeIsPrimary(myself) && server.cluster->size == 1) {
                     markNodeAsFailingIfNeeded(node);
                 } else {
-                    serverLog(LL_DEBUG, "*** NODE %.40s possibly failing", node->name);
+                    serverLog(LL_NOTICE, "NODE %.40s possibly failing.", node->name);
                 }
             }
         }