diff --git a/pandora_console/extras/mr/46.sql b/pandora_console/extras/mr/46.sql
index bef40253a2..833e1a7a49 100644
--- a/pandora_console/extras/mr/46.sql
+++ b/pandora_console/extras/mr/46.sql
@@ -5,6 +5,22 @@ ALTER TABLE `tagent_custom_fields` MODIFY COLUMN `combo_values` TEXT NOT NULL DE
 ALTER TABLE `treport_content` MODIFY `external_source` MEDIUMTEXT;
 ALTER TABLE `treport_content_template` MODIFY `external_source` MEDIUMTEXT;
 
+ALTER TABLE `tevent_rule` MODIFY COLUMN `agent` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `id_usuario` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `id_grupo` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `evento` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `event_type` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `module` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `alert` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `criticity` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `user_comment` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `id_tag` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `name` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `group_recursion` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `log_content` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `log_source` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `log_agent` TEXT;
+
 UPDATE `talert_commands` SET `fields_descriptions` = '[\"Event name\",\"Event type\",\"Source\",\"Agent name or _agent_\",\"Event severity\",\"ID extra\",\"Tags separated by commas\",\"Comments\",\"\",\"\"]' WHERE `name` = "Monitoring Event";
 
 UPDATE `tskin` SET `name` = 'Default theme' , `relative_path` = 'pandora.css' WHERE `id` = 1;
diff --git a/pandora_console/extras/pandoradb_migrate_6.0_to_7.0.mysql.sql b/pandora_console/extras/pandoradb_migrate_6.0_to_7.0.mysql.sql
index 9b35347564..bfb3d93c8d 100644
--- a/pandora_console/extras/pandoradb_migrate_6.0_to_7.0.mysql.sql
+++ b/pandora_console/extras/pandoradb_migrate_6.0_to_7.0.mysql.sql
@@ -628,6 +628,22 @@ ALTER TABLE `tevent_rule` MODIFY COLUMN `event_type` enum('','unknown','alert_fi
 ALTER TABLE `tevent_rule` MODIFY COLUMN `criticity` int(4) unsigned DEFAULT NULL;
 ALTER TABLE `tevent_rule` MODIFY COLUMN `id_grupo` mediumint(4) DEFAULT NULL;
 
+ALTER TABLE `tevent_rule` MODIFY COLUMN `agent` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `id_usuario` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `id_grupo` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `evento` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `event_type` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `module` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `alert` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `criticity` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `user_comment` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `id_tag` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `name` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `group_recursion` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `log_content` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `log_source` TEXT;
+ALTER TABLE `tevent_rule` MODIFY COLUMN `log_agent` TEXT;
+
 UPDATE `tevent_rule` SET `operator_agent` = "REGEX" WHERE `agent` != '';
 UPDATE `tevent_rule` SET `operator_id_usuario` = "REGEX" WHERE `id_usuario` != '';
 UPDATE `tevent_rule` SET `operator_id_grupo` = "REGEX" WHERE `id_grupo` > 0;
diff --git a/pandora_console/include/styles/alert.css b/pandora_console/include/styles/alert.css
index 9a068cba34..eb8f2d7583 100644
--- a/pandora_console/include/styles/alert.css
+++ b/pandora_console/include/styles/alert.css
@@ -1,12 +1,44 @@
+.rules div {
+  display: inline-block;
+}
+
 li#li-buttons-alert-list > div {
   margin-left: 10px;
 }
 
+ul.sample li {
+  padding-bottom: 1em;
+}
+ul.sample li:last-child {
+  padding-bottom: 0;
+}
+
 #rule-builder .rule-builder-actions li {
   display: inline;
   width: auto;
 }
 
+li#li-filters_show_action_alerts > label,
+li#li-buttons-alert-list > label,
+li#li-filters-alert-list > label {
+  width: initial;
+}
+
+form#advanced_filters_alert ul li label,
+form#general_filters_alert ul li label {
+  width: 150px;
+}
+
+#rules.flex-row label {
+  flex: 1 1 70px;
+}
+
+li#li-from-to-threshold > label:not(:first-child),
+li#li-time-from-to > label:not(:first-child) {
+  width: initial;
+  margin-right: 15px;
+}
+
 #rule-builder .rule-builder-actions li label {
   width: 0;
 }
@@ -21,10 +53,6 @@ ul.sample {
   flex: 1 1 300px;
 }
 
-#rules.flex-row label {
-  flex: 1 1 70px;
-}
-
 #rules.flex-row div {
   flex: 10 1 200px;
 }
@@ -39,17 +67,6 @@ span.rule-title {
   width: 100%;
 }
 
-li#li-filters_show_action_alerts > label,
-li#li-buttons-alert-list > label,
-li#li-filters-alert-list > label {
-  width: initial;
-}
-
-form#advanced_filters_alert ul li label,
-form#general_filters_alert ul li label {
-  width: 150px;
-}
-
 form#conditions_filters_alert ul li label:first-child {
   width: 300px;
 }
@@ -62,17 +79,14 @@ li#li-description textarea {
   flex: 1 1 auto;
 }
 
-li#li-from-to-threshold > label:not(:first-child),
-li#li-time-from-to > label:not(:first-child) {
-  width: initial;
-  margin-right: 15px;
-}
-
 li#li-from-to-threshold > input,
 li#li-time-from-to > input {
   margin-right: 15px;
 }
-
+.mode_table_firing table.info_table thead tr th img {
+  padding: 10px;
+  vertical-align: middle;
+}
 form#advanced_filters_alert textarea {
   flex: 1 1 auto;
   height: 5em;
@@ -106,19 +120,16 @@ ul.sample {
   max-width: 50%;
   flex-grow: 1;
   justify-content: space-between;
+  min-width: 300px;
 }
-ul.sample li {
-  padding-bottom: 1em;
-}
-ul.sample li:last-child {
-  padding-bottom: 0;
-}
+
 div.target {
   flex-grow: 1;
   flex-basis: auto;
   margin-left: 3em;
   display: flex;
   flex-direction: column;
+  width: 100%;
 }
 div.target.flex {
   display: block;
@@ -140,28 +151,28 @@ div.target.flex {
   position: relative;
   top: 25%;
   display: block;
-  left: 37%;
+  margin: 0 auto;
   font-size: 3em;
   color: #aaa;
   overflow: hidden;
-  width: 6em;
   background: #fff;
   text-align: center;
-  z-index: 2;
 }
-div#rules.show::after {
+div#rules::after {
+  content: "Drop Here";
   position: relative;
-  top: 25%;
   display: block;
-  left: 37%;
+  margin: 2em auto;
   font-size: 3em;
   color: #aaa;
   overflow: hidden;
-  width: 6em;
   background: #fff;
   text-align: center;
-  z-index: 2;
 }
+div#rules.cleanup::after {
+  content: none;
+}
+
 div#rules.show {
   box-shadow: 0 0 15px -5px #424242;
   border: 1px solid #ddd;
@@ -185,7 +196,10 @@ div#rules.show {
   opacity: 0.2;
   cursor: not-allowed;
 }
-
+.field.disabledElements {
+  opacity: 0.2;
+  cursor: not-allowed;
+}
 .log {
   background-color: #638460;
 }
@@ -209,10 +223,6 @@ div#rules.show {
   background-color: #424242;
 }
 
-.rules div {
-  display: inline-block;
-}
-
 .inEdit {
   background-color: #888;
 }
@@ -253,11 +263,6 @@ div#rules.show {
   font-weight: bolder;
 }
 
-.mode_table_firing table.info_table thead tr th img {
-  padding: 10px;
-  vertical-align: middle;
-}
-
 #rules select.click-list-elements {
   border-radius: 0px;
   background-color: #424242;
diff --git a/pandora_console/pandoradb.sql b/pandora_console/pandoradb.sql
index 8d8a809d3c..3e4b5b0605 100644
--- a/pandora_console/pandoradb.sql
+++ b/pandora_console/pandoradb.sql
@@ -2913,18 +2913,18 @@ CREATE TABLE IF NOT EXISTS `tevent_rule` (
 	`order` int(10) unsigned default '0',
 	`window` int(10) NOT NULL default '0',
 	`count` int(4) NOT NULL default '1',
-	`agent` text default '',
-	`id_usuario` varchar(100) NOT NULL default '',
-	`id_grupo` mediumint(4) default NULL,
-	`evento` text NOT NULL default '',
-	`event_type` enum('','unknown','alert_fired','alert_recovered','alert_ceased','alert_manual_validation','recon_host_detected','system','error','new_agent','going_up_warning','going_up_critical','going_down_warning','going_down_normal','going_down_critical','going_up_normal') default '',
-	`module` text default '',
-	`alert` text default '',
-	`criticity` int(4) unsigned default NULL,
-	`user_comment` text NOT NULL,
-	`id_tag` integer(10) unsigned NOT NULL default '0',
-	`name` text default '',
-	`group_recursion` INT(1) unsigned default 0,
+	`agent` text,
+	`id_usuario` text,
+	`id_grupo` text,
+	`evento` text,
+	`event_type` text,
+	`module` text,
+	`alert` text,
+	`criticity` text,
+	`user_comment` text,
+	`id_tag` text,
+	`name` text,
+	`group_recursion` text,
 	`log_content` text,
 	`log_source` text,
 	`log_agent` text,
diff --git a/pandora_server/conf/pandora_server.conf.new b/pandora_server/conf/pandora_server.conf.new
index ad2ef22e28..53ae7a4604 100644
--- a/pandora_server/conf/pandora_server.conf.new
+++ b/pandora_server/conf/pandora_server.conf.new
@@ -470,6 +470,9 @@ log_window 3600
 # Pre-load windows on start with available information. (PANDORA FMS ENTERPRISE ONLY).
 #preload_windows 0
 
+# Correlated Alerts, group cache ttl (in seconds). Set to 0 to disable. (PANDORA FMS ENTERPRISE ONLY).
+#event_server_cache_ttl 10
+
 # If set to 1, an alert will not be fired if the last event it generated is in 'in-process' status.
 
 event_inhibit_alerts 0
diff --git a/pandora_server/lib/PandoraFMS/Config.pm b/pandora_server/lib/PandoraFMS/Config.pm
index 85c73ea84b..4c131bc080 100644
--- a/pandora_server/lib/PandoraFMS/Config.pm
+++ b/pandora_server/lib/PandoraFMS/Config.pm
@@ -302,6 +302,7 @@ sub pandora_load_config {
 	$pa_config->{"eventserver"} = 1; # 4.0
 	$pa_config->{"event_window"} = 3600; # 4.0
 	$pa_config->{"log_window"} = 3600; # 7.741
+	$pa_config->{"event_server_cache_ttl"} = 10; # 7.754
 	$pa_config->{"preload_windows"} = 0; # 7.741
 	$pa_config->{"icmpserver"} = 0; # 4.0
 	$pa_config->{"icmp_threads"} = 3; # 4.0
@@ -1001,6 +1002,9 @@ sub pandora_load_config {
 		elsif ($parametro =~ m/^preload_windows\s+([0-9]*)/i) {
 			$pa_config->{'preload_windows'}= clean_blank($1);
 		}
+		elsif ($parametro =~ m/^event_server_cache_ttl\s+([0-9]*)/i) {
+			$pa_config->{"event_server_cache_ttl"} = clean_blank($1);
+		}
 		elsif ($parametro =~ m/^snmp_threads\s+([0-9]*)/i) {
 			$pa_config->{'snmp_threads'}= clean_blank($1);
 		}
diff --git a/pandora_server/lib/PandoraFMS/DB.pm b/pandora_server/lib/PandoraFMS/DB.pm
index 045e84f1e2..1148984d18 100644
--- a/pandora_server/lib/PandoraFMS/DB.pm
+++ b/pandora_server/lib/PandoraFMS/DB.pm
@@ -92,6 +92,7 @@ our @EXPORT = qw(
 		get_priority_name
 		get_server_id
 		get_tag_id
+		get_tag_name
 		get_group_name
 		get_template_id
 		get_template_module_id
@@ -276,6 +277,20 @@ sub get_tag_id ($$) {
 	return defined ($rc) ? $rc : -1;
 }
 
+########################################################################
+## Return the name of a tag given its id.
+########################################################################
+sub get_tag_name ($$) {
+	my ($dbh, $id) = @_;
+
+	my $rc = get_db_value(
+		$dbh, "SELECT name FROM ttag
+					WHERE id_tag = ?",
+		safe_input($id)
+	);
+	return $rc;
+}
+
 ########################################################################
 ## Return the first enabled server name found.
 ########################################################################