MM-25050: Add gossip encryption to telemetry (#15137)

app/diagnostics.go

@@ -593,6 +593,7 @@ func (s *Server) trackConfig() {
 		"advertise_address":                     isDefault(*cfg.ClusterSettings.AdvertiseAddress, ""),
 		"use_ip_address":                        *cfg.ClusterSettings.UseIpAddress,
 		"use_experimental_gossip":               *cfg.ClusterSettings.UseExperimentalGossip,
+		"enable_experimental_gossip_encryption": *cfg.ClusterSettings.EnableExperimentalGossipEncryption,
 		"read_only_config":                      *cfg.ClusterSettings.ReadOnlyConfig,
 	})