Merge pull request #12616 from AndriiLandiak/notifications-on-resource-shortage

Notification on resources shortage

application/src/main/java/org/thingsboard/server/install/ThingsboardInstallService.java

@@ -116,6 +116,7 @@ public class ThingsboardInstallService {
                     entityDatabaseSchemaService.createDatabaseIndexes();
 
                     // TODO: cleanup update code after each release
+                    systemDataLoaderService.updateDefaultNotificationConfigs(false);
 
                     // Runs upgrade scripts that are not possible in plain SQL.
                     dataUpdateService.updateData();

application/src/main/java/org/thingsboard/server/service/notification/rule/trigger/ResourcesShortageTriggerProcessor.java

@@ -0,0 +1,50 @@
+/**
+ * Copyright © 2016-2025 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.service.notification.rule.trigger;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.thingsboard.server.common.data.notification.info.ResourcesShortageNotificationInfo;
+import org.thingsboard.server.common.data.notification.info.RuleOriginatedNotificationInfo;
+import org.thingsboard.server.common.data.notification.rule.trigger.ResourcesShortageTrigger;
+import org.thingsboard.server.common.data.notification.rule.trigger.config.NotificationRuleTriggerType;
+import org.thingsboard.server.common.data.notification.rule.trigger.config.ResourcesShortageNotificationRuleTriggerConfig;
+
+@Service
+@RequiredArgsConstructor
+public class ResourcesShortageTriggerProcessor implements NotificationRuleTriggerProcessor<ResourcesShortageTrigger, ResourcesShortageNotificationRuleTriggerConfig> {
+
+    @Override
+    public boolean matchesFilter(ResourcesShortageTrigger trigger, ResourcesShortageNotificationRuleTriggerConfig triggerConfig) {
+        float usagePercent = trigger.getUsage() / 100.0f;
+        return switch (trigger.getResource()) {
+            case CPU -> usagePercent >= triggerConfig.getCpuThreshold();
+            case RAM -> usagePercent >= triggerConfig.getRamThreshold();
+            case STORAGE -> usagePercent >= triggerConfig.getStorageThreshold();
+        };
+    }
+
+    @Override
+    public RuleOriginatedNotificationInfo constructNotificationInfo(ResourcesShortageTrigger trigger) {
+        return ResourcesShortageNotificationInfo.builder().resource(trigger.getResource().name()).usage(trigger.getUsage()).build();
+    }
+
+    @Override
+    public NotificationRuleTriggerType getTriggerType() {
+        return NotificationRuleTriggerType.RESOURCES_SHORTAGE;
+    }
+
+}

application/src/main/java/org/thingsboard/server/service/system/DefaultSystemInfoService.java

@@ -39,6 +39,9 @@ import org.thingsboard.server.common.data.kv.BooleanDataEntry;
 import org.thingsboard.server.common.data.kv.JsonDataEntry;
 import org.thingsboard.server.common.data.kv.LongDataEntry;
 import org.thingsboard.server.common.data.kv.TsKvEntry;
+import org.thingsboard.server.common.data.notification.rule.trigger.ResourcesShortageTrigger;
+import org.thingsboard.server.common.data.notification.rule.trigger.ResourcesShortageTrigger.Resource;
+import org.thingsboard.server.common.msg.notification.NotificationRuleProcessor;
 import org.thingsboard.server.common.msg.queue.ServiceType;
 import org.thingsboard.server.common.stats.TbApiUsageStateClient;
 import org.thingsboard.server.dao.domain.DomainService;
@@ -92,6 +95,7 @@ public class DefaultSystemInfoService extends TbApplicationEventListener<Partiti
     private final DomainService domainService;
     private final MailService mailService;
     private final SmsService smsService;
+    private final NotificationRuleProcessor notificationRuleProcessor;
     private volatile ScheduledExecutorService scheduler;
 
     @Value("${metrics.system_info.persist_frequency:60}")
@@ -163,7 +167,7 @@ public class DefaultSystemInfoService extends TbApplicationEventListener<Partiti
         if (twoFaSettings != null) {
             var providers = twoFaSettings.getJsonValue().get("providers");
             if (providers != null) {
-                return providers.size() > 0;
+                return !providers.isEmpty();
             }
         }
         return false;
@@ -180,6 +184,11 @@ public class DefaultSystemInfoService extends TbApplicationEventListener<Partiti
     private void saveCurrentClusterSystemInfo() {
         long ts = System.currentTimeMillis();
         List<SystemInfoData> clusterSystemData = getSystemData(serviceInfoProvider.getServiceInfo());
+        clusterSystemData.forEach(data -> {
+            notificationRuleProcessor.process(ResourcesShortageTrigger.builder().resource(Resource.CPU).usage(data.getCpuUsage()).build());
+            notificationRuleProcessor.process(ResourcesShortageTrigger.builder().resource(Resource.RAM).usage(data.getMemoryUsage()).build());
+            notificationRuleProcessor.process(ResourcesShortageTrigger.builder().resource(Resource.STORAGE).usage(data.getDiscUsage()).build());
+        });
         BasicTsKvEntry clusterDataKv = new BasicTsKvEntry(ts, new JsonDataEntry("clusterSystemData", JacksonUtil.toString(clusterSystemData)));
         doSave(Arrays.asList(new BasicTsKvEntry(ts, new BooleanDataEntry("clusterMode", true)), clusterDataKv));
     }
@@ -188,9 +197,21 @@ public class DefaultSystemInfoService extends TbApplicationEventListener<Partiti
         long ts = System.currentTimeMillis();
         List<TsKvEntry> tsList = new ArrayList<>();
         tsList.add(new BasicTsKvEntry(ts, new BooleanDataEntry("clusterMode", false)));
-        getCpuUsage().ifPresent(v -> tsList.add(new BasicTsKvEntry(ts, new LongDataEntry("cpuUsage", (long) v))));
-        getMemoryUsage().ifPresent(v -> tsList.add(new BasicTsKvEntry(ts, new LongDataEntry("memoryUsage", (long) v))));
-        getDiscSpaceUsage().ifPresent(v -> tsList.add(new BasicTsKvEntry(ts, new LongDataEntry("discUsage", (long) v))));
+        getCpuUsage().ifPresent(v -> {
+            long value = (long) v;
+            tsList.add(new BasicTsKvEntry(ts, new LongDataEntry("cpuUsage", value)));
+            notificationRuleProcessor.process(ResourcesShortageTrigger.builder().resource(Resource.CPU).usage(value).build());
+        });
+        getMemoryUsage().ifPresent(v -> {
+            long value = (long) v;
+            tsList.add(new BasicTsKvEntry(ts, new LongDataEntry("memoryUsage", value)));
+            notificationRuleProcessor.process(ResourcesShortageTrigger.builder().resource(Resource.RAM).usage(value).build());
+        });
+        getDiscSpaceUsage().ifPresent(v -> {
+            long value = (long) v;
+            tsList.add(new BasicTsKvEntry(ts, new LongDataEntry("discUsage", value)));
+            notificationRuleProcessor.process(ResourcesShortageTrigger.builder().resource(Resource.STORAGE).usage(value).build());
+        });
 
         getCpuCount().ifPresent(v -> tsList.add(new BasicTsKvEntry(ts, new LongDataEntry("cpuCount", (long) v))));
         getTotalMemory().ifPresent(v -> tsList.add(new BasicTsKvEntry(ts, new LongDataEntry("totalMemory", v))));
@@ -244,4 +265,5 @@ public class DefaultSystemInfoService extends TbApplicationEventListener<Partiti
             scheduler = null;
         }
     }
+
 }

application/src/test/java/org/thingsboard/server/service/notification/NotificationRuleApiTest.java

@@ -68,6 +68,8 @@ import org.thingsboard.server.common.data.notification.rule.NotificationRule;
 import org.thingsboard.server.common.data.notification.rule.NotificationRuleInfo;
 import org.thingsboard.server.common.data.notification.rule.trigger.NewPlatformVersionTrigger;
 import org.thingsboard.server.common.data.notification.rule.trigger.RateLimitsTrigger;
+import org.thingsboard.server.common.data.notification.rule.trigger.ResourcesShortageTrigger;
+import org.thingsboard.server.common.data.notification.rule.trigger.ResourcesShortageTrigger.Resource;
 import org.thingsboard.server.common.data.notification.rule.trigger.config.AlarmAssignmentNotificationRuleTriggerConfig;
 import org.thingsboard.server.common.data.notification.rule.trigger.config.AlarmCommentNotificationRuleTriggerConfig;
 import org.thingsboard.server.common.data.notification.rule.trigger.config.AlarmNotificationRuleTriggerConfig;
@@ -78,6 +80,7 @@ import org.thingsboard.server.common.data.notification.rule.trigger.config.Entit
 import org.thingsboard.server.common.data.notification.rule.trigger.config.NewPlatformVersionNotificationRuleTriggerConfig;
 import org.thingsboard.server.common.data.notification.rule.trigger.config.NotificationRuleTriggerType;
 import org.thingsboard.server.common.data.notification.rule.trigger.config.RateLimitsNotificationRuleTriggerConfig;
+import org.thingsboard.server.common.data.notification.rule.trigger.config.ResourcesShortageNotificationRuleTriggerConfig;
 import org.thingsboard.server.common.data.notification.targets.NotificationTarget;
 import org.thingsboard.server.common.data.notification.targets.platform.AffectedTenantAdministratorsFilter;
 import org.thingsboard.server.common.data.notification.targets.platform.SystemAdministratorsFilter;
@@ -91,6 +94,7 @@ import org.thingsboard.server.common.data.rule.RuleChain;
 import org.thingsboard.server.common.data.rule.RuleChainMetaData;
 import org.thingsboard.server.common.data.security.Authority;
 import org.thingsboard.server.common.msg.notification.NotificationRuleProcessor;
+import org.thingsboard.server.controller.TbTestWebSocketClient;
 import org.thingsboard.server.dao.notification.DefaultNotifications;
 import org.thingsboard.server.dao.notification.NotificationRequestService;
 import org.thingsboard.server.dao.rule.RuleChainService;
@@ -98,8 +102,10 @@ import org.thingsboard.server.dao.service.DaoSqlTest;
 import org.thingsboard.server.queue.notification.DefaultNotificationDeduplicationService;
 import org.thingsboard.server.service.notification.rule.cache.DefaultNotificationRulesCache;
 import org.thingsboard.server.service.state.DeviceStateService;
+import org.thingsboard.server.service.system.DefaultSystemInfoService;
 import org.thingsboard.server.service.telemetry.AlarmSubscriptionService;
 
+import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -134,6 +140,8 @@ public class NotificationRuleApiTest extends AbstractNotificationApiTest {
     @SpyBean
     private AlarmSubscriptionService alarmSubscriptionService;
     @Autowired
+    private DefaultSystemInfoService systemInfoService;
+    @Autowired
     private NotificationRequestService notificationRequestService;
     @Autowired
     private RateLimitService rateLimitService;
@@ -254,7 +262,7 @@ public class NotificationRuleApiTest extends AbstractNotificationApiTest {
             assertThat(info.getAlarmStatus()).isEqualTo(AlarmStatus.ACTIVE_UNACK);
         });
 
-        clients.values().forEach(wsClient -> wsClient.registerWaitForUpdate());
+        clients.values().forEach(TbTestWebSocketClient::registerWaitForUpdate);
         alarmSubscriptionService.acknowledgeAlarm(tenantId, alarm.getId(), System.currentTimeMillis());
         AlarmStatus expectedStatus = AlarmStatus.ACTIVE_ACK;
         AlarmSeverity expectedSeverity = AlarmSeverity.CRITICAL;
@@ -638,7 +646,7 @@ public class NotificationRuleApiTest extends AbstractNotificationApiTest {
         rule = saveNotificationRule(rule);
 
         NotificationRuleInfo ruleInfo = findNotificationRules().getData().get(0);
-        assertThat(ruleInfo.getId()).isEqualTo(ruleInfo.getId());
+        assertThat(ruleInfo.getId()).isEqualTo(rule.getId());
         assertThat(ruleInfo.getTemplateName()).isEqualTo(template.getName());
         assertThat(ruleInfo.getDeliveryMethods()).containsOnly(deliveryMethods);
     }
@@ -780,6 +788,59 @@ public class NotificationRuleApiTest extends AbstractNotificationApiTest {
                 });
     }
 
+    @Test
+    public void testNotificationRuleProcessing_resourcesShortage() throws Exception {
+        loginSysAdmin();
+        ResourcesShortageNotificationRuleTriggerConfig triggerConfig = ResourcesShortageNotificationRuleTriggerConfig.builder()
+                .ramThreshold(0.01f)
+                .cpuThreshold(1f)
+                .storageThreshold(1f)
+                .build();
+        createNotificationRule(triggerConfig, "Warning: ${resource} shortage", "${resource} shortage", createNotificationTarget(tenantAdminUserId).getId());
+        loginTenantAdmin();
+
+        Method method = DefaultSystemInfoService.class.getDeclaredMethod("saveCurrentMonolithSystemInfo");
+        method.setAccessible(true);
+        method.invoke(systemInfoService);
+
+        await().atMost(10, TimeUnit.SECONDS).until(() -> getMyNotifications(false, 100).size() == 1);
+        Notification notification = getMyNotifications(false, 100).get(0);
+        assertThat(notification.getSubject()).isEqualTo("Warning: RAM shortage");
+        assertThat(notification.getText()).isEqualTo("RAM shortage");
+    }
+
+    @Test
+    public void testNotificationsDeduplication_resourcesShortage() throws Exception {
+        loginSysAdmin();
+        ResourcesShortageNotificationRuleTriggerConfig triggerConfig = ResourcesShortageNotificationRuleTriggerConfig.builder()
+                .ramThreshold(0.01f)
+                .cpuThreshold(1f)
+                .storageThreshold(1f)
+                .build();
+        createNotificationRule(triggerConfig, "Warning: ${resource} shortage", "${resource} shortage", createNotificationTarget(tenantAdminUserId).getId());it a
+        loginTenantAdmin();
+
+        assertThat(getMyNotifications(false, 100)).size().isZero();
+        for (int i = 0; i < 10; i++) {
+            notificationRuleProcessor.process(ResourcesShortageTrigger.builder()
+                    .resource(Resource.RAM)
+                    .usage(15L)
+                    .build());
+            TimeUnit.MILLISECONDS.sleep(300);
+        }
+        await().atMost(10, TimeUnit.SECONDS).until(() -> getMyNotifications(false, 100).size() == 1);
+        Notification notification = getMyNotifications(false, 100).get(0);
+        assertThat(notification.getSubject()).isEqualTo("Warning: RAM shortage");
+        assertThat(notification.getText()).isEqualTo("RAM shortage");
+
+        // deduplication is 5 minute, no new message is exp
+        notificationRuleProcessor.process(ResourcesShortageTrigger.builder()
+                .resource(Resource.RAM)
+                .usage(5L)
+                .build());
+        await("").atMost(5, TimeUnit.SECONDS).untilAsserted(() -> assertThat(getMyNotifications(false, 100)).size().isOne());
+    }
+
     @Test
     public void testNotificationRuleDisabling() throws Exception {
         EntityActionNotificationRuleTriggerConfig triggerConfig = new EntityActionNotificationRuleTriggerConfig();

common/data/src/main/java/org/thingsboard/server/common/data/notification/NotificationType.java

@@ -37,7 +37,8 @@ public enum NotificationType {
     RATE_LIMITS,
     EDGE_CONNECTION,
     EDGE_COMMUNICATION_FAILURE,
-    TASK_PROCESSING_FAILURE;
+    TASK_PROCESSING_FAILURE,
+    RESOURCES_SHORTAGE;
 
     @Getter
     private boolean system; // for future use and compatibility with PE

common/data/src/main/java/org/thingsboard/server/common/data/notification/info/ResourcesShortageNotificationInfo.java

@@ -0,0 +1,42 @@
+/**
+ * Copyright © 2016-2025 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.common.data.notification.info;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.Map;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class ResourcesShortageNotificationInfo implements RuleOriginatedNotificationInfo {
+
+    private String resource;
+    private Long usage;
+
+    @Override
+    public Map<String, String> getTemplateData() {
+        return Map.of(
+                "resource", resource,
+                "usage", String.valueOf(usage)
+        );
+    }
+
+}

common/data/src/main/java/org/thingsboard/server/common/data/notification/rule/trigger/NewPlatformVersionTrigger.java

@@ -55,9 +55,4 @@ public class NewPlatformVersionTrigger implements NotificationRuleTrigger {
                 updateInfo.getCurrentVersion(), updateInfo.getLatestVersion());
     }
 
-    @Override
-    public long getDefaultDeduplicationDuration() {
-        return 0;
-    }
-
 }

common/data/src/main/java/org/thingsboard/server/common/data/notification/rule/trigger/ResourcesShortageTrigger.java

@@ -0,0 +1,71 @@
+/**
+ * Copyright © 2016-2025 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.common.data.notification.rule.trigger;
+
+import lombok.Builder;
+import lombok.Data;
+import org.thingsboard.server.common.data.id.EntityId;
+import org.thingsboard.server.common.data.id.TenantId;
+import org.thingsboard.server.common.data.notification.rule.trigger.config.NotificationRuleTriggerType;
+
+import java.io.Serial;
+import java.util.concurrent.TimeUnit;
+
+@Data
+@Builder
+public class ResourcesShortageTrigger implements NotificationRuleTrigger {
+
+    @Serial
+    private static final long serialVersionUID = 6024216015202949570L;
+
+    private Resource resource;
+    private Long usage;
+
+    @Override
+    public TenantId getTenantId() {
+        return TenantId.SYS_TENANT_ID;
+    }
+
+    @Override
+    public EntityId getOriginatorEntityId() {
+        return TenantId.SYS_TENANT_ID;
+    }
+
+    @Override
+    public boolean deduplicate() {
+        return true;
+    }
+
+    @Override
+    public String getDeduplicationKey() {
+        return resource.name();
+    }
+
+    @Override
+    public long getDefaultDeduplicationDuration() {
+        return TimeUnit.HOURS.toMillis(1);
+    }
+
+    @Override
+    public NotificationRuleTriggerType getType() {
+        return NotificationRuleTriggerType.RESOURCES_SHORTAGE;
+    }
+
+    public enum Resource {
+        CPU, RAM, STORAGE
+    }
+
+}

common/data/src/main/java/org/thingsboard/server/common/data/notification/rule/trigger/TaskProcessingFailureTrigger.java

@@ -22,10 +22,15 @@ import org.thingsboard.server.common.data.id.EntityId;
 import org.thingsboard.server.common.data.id.TenantId;
 import org.thingsboard.server.common.data.notification.rule.trigger.config.NotificationRuleTriggerType;
 
+import java.io.Serial;
+
 @Data
 @Builder
 public class TaskProcessingFailureTrigger implements NotificationRuleTrigger {
 
+    @Serial
+    private static final long serialVersionUID = 5606203770553105345L;
+
     private final HousekeeperTask task;
     private final int attempt;
     private final Throwable error;
@@ -45,9 +50,4 @@ public class TaskProcessingFailureTrigger implements NotificationRuleTrigger {
         return task.getEntityId();
     }
 
-    @Override
-    public boolean deduplicate() {
-        return false;
-    }
-
 }

common/data/src/main/java/org/thingsboard/server/common/data/notification/rule/trigger/config/NotificationRuleTriggerConfig.java

@@ -38,7 +38,8 @@ import java.io.Serializable;
         @Type(value = RateLimitsNotificationRuleTriggerConfig.class, name = "RATE_LIMITS"),
         @Type(value = EdgeConnectionNotificationRuleTriggerConfig.class, name = "EDGE_CONNECTION"),
         @Type(value = EdgeCommunicationFailureNotificationRuleTriggerConfig.class, name = "EDGE_COMMUNICATION_FAILURE"),
-        @Type(value = TaskProcessingFailureNotificationRuleTriggerConfig.class, name = "TASK_PROCESSING_FAILURE")
+        @Type(value = TaskProcessingFailureNotificationRuleTriggerConfig.class, name = "TASK_PROCESSING_FAILURE"),
+        @Type(value = ResourcesShortageNotificationRuleTriggerConfig.class, name = "RESOURCES_SHORTAGE")
 })
 public interface NotificationRuleTriggerConfig extends Serializable {
 

common/data/src/main/java/org/thingsboard/server/common/data/notification/rule/trigger/config/NotificationRuleTriggerType.java

@@ -32,7 +32,8 @@ public enum NotificationRuleTriggerType {
     ENTITIES_LIMIT(false),
     API_USAGE_LIMIT(false),
     RATE_LIMITS(false),
-    TASK_PROCESSING_FAILURE(false);
+    TASK_PROCESSING_FAILURE(false),
+    RESOURCES_SHORTAGE(false);
 
     private final boolean tenantLevel;
 

common/data/src/main/java/org/thingsboard/server/common/data/notification/rule/trigger/config/ResourcesShortageNotificationRuleTriggerConfig.java

@@ -0,0 +1,47 @@
+/**
+ * Copyright © 2016-2025 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.common.data.notification.rule.trigger.config;
+
+import jakarta.validation.constraints.Max;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.io.Serial;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+@Builder
+public class ResourcesShortageNotificationRuleTriggerConfig implements NotificationRuleTriggerConfig {
+
+    @Serial
+    private static final long serialVersionUID = 339395299693241424L;
+
+    @Max(1)
+    private float cpuThreshold; // in percents
+    @Max(1)
+    private float ramThreshold; // in percents
+    @Max(1)
+    private float storageThreshold; // in percents
+
+    @Override
+    public NotificationRuleTriggerType getTriggerType() {
+        return NotificationRuleTriggerType.RESOURCES_SHORTAGE;
+    }
+
+}

dao/src/main/java/org/thingsboard/server/dao/notification/DefaultNotificationSettingsService.java

@@ -186,6 +186,7 @@ public class DefaultNotificationSettingsService implements NotificationSettingsS
             defaultNotifications.create(tenantId, DefaultNotifications.exceededRateLimitsForSysadmin, sysAdmins.getId());
             defaultNotifications.create(tenantId, DefaultNotifications.newPlatformVersion, sysAdmins.getId());
             defaultNotifications.create(tenantId, DefaultNotifications.taskProcessingFailure, tenantAdmins.getId());
+            defaultNotifications.create(tenantId, DefaultNotifications.resourcesShortage, sysAdmins.getId());
             return;
         }
 
@@ -221,6 +222,9 @@ public class DefaultNotificationSettingsService implements NotificationSettingsS
             if (!isNotificationConfigured(tenantId, NotificationType.TASK_PROCESSING_FAILURE)) {
                 defaultNotifications.create(tenantId, DefaultNotifications.taskProcessingFailure, sysAdmins.getId());
             }
+            if (!isNotificationConfigured(tenantId, NotificationType.RESOURCES_SHORTAGE)) {
+                defaultNotifications.create(tenantId, DefaultNotifications.resourcesShortage, sysAdmins.getId());
+            }
         } else {
             var requiredNotificationTypes = List.of(NotificationType.EDGE_CONNECTION, NotificationType.EDGE_COMMUNICATION_FAILURE);
             var existingNotificationTypes = notificationTemplateService.findNotificationTemplatesByTenantIdAndNotificationTypes(

dao/src/main/java/org/thingsboard/server/dao/notification/DefaultNotifications.java

@@ -33,6 +33,7 @@ import org.thingsboard.server.common.data.notification.rule.DefaultNotificationR
 import org.thingsboard.server.common.data.notification.rule.EscalatedNotificationRuleRecipientsConfig;
 import org.thingsboard.server.common.data.notification.rule.NotificationRule;
 import org.thingsboard.server.common.data.notification.rule.NotificationRuleConfig;
+import org.thingsboard.server.common.data.notification.rule.trigger.ResourcesShortageTrigger.Resource;
 import org.thingsboard.server.common.data.notification.rule.trigger.config.AlarmAssignmentNotificationRuleTriggerConfig;
 import org.thingsboard.server.common.data.notification.rule.trigger.config.AlarmCommentNotificationRuleTriggerConfig;
 import org.thingsboard.server.common.data.notification.rule.trigger.config.AlarmNotificationRuleTriggerConfig;
@@ -49,6 +50,7 @@ import org.thingsboard.server.common.data.notification.rule.trigger.config.NewPl
 import org.thingsboard.server.common.data.notification.rule.trigger.config.NotificationRuleTriggerConfig;
 import org.thingsboard.server.common.data.notification.rule.trigger.config.NotificationRuleTriggerType;
 import org.thingsboard.server.common.data.notification.rule.trigger.config.RateLimitsNotificationRuleTriggerConfig;
+import org.thingsboard.server.common.data.notification.rule.trigger.config.ResourcesShortageNotificationRuleTriggerConfig;
 import org.thingsboard.server.common.data.notification.rule.trigger.config.RuleEngineComponentLifecycleEventNotificationRuleTriggerConfig;
 import org.thingsboard.server.common.data.notification.rule.trigger.config.TaskProcessingFailureNotificationRuleTriggerConfig;
 import org.thingsboard.server.common.data.notification.template.NotificationTemplate;
@@ -372,6 +374,20 @@ public class DefaultNotifications {
                     .build())
             .build();
 
+    public static final DefaultNotification resourcesShortage = DefaultNotification.builder()
+            .name("Resources shortage notification")
+            .type(NotificationType.RESOURCES_SHORTAGE)
+            .subject("Warning: ${resource} shortage")
+            .text("${resource} usage is at ${usage}%.")
+            .icon("warning")
+            .rule(DefaultRule.builder()
+                    .name("Resources shortage")
+                    .triggerConfig(ResourcesShortageNotificationRuleTriggerConfig.builder().cpuThreshold(0.8f).storageThreshold(0.8f).ramThreshold(0.8f).build())
+                    .description("Send notification to system admins on resource shortage")
+                    .build())
+            .color(RED_COLOR)
+            .build();
+
     private final NotificationTemplateService templateService;
     private final NotificationRuleService ruleService;
 

ui-ngx/src/app/modules/home/pages/notification/rule/rule-notification-dialog.component.html

@@ -480,17 +480,18 @@
                                ignoreAuthorityFilter
                                [allowedEntityTypes]="allowEntityTypeForEntitiesLimit">
           </tb-entity-type-list>
-          <div class="limit-slider-container flex flex-row items-center justify-start xs:flex-col xs:items-stretch">
-            <label translate>notification.threshold</label>
+          <div class="limit-slider-container mb-4 flex flex-row items-center justify-start xs:flex-col xs:items-stretch">
+            <span translate>notification.threshold</span>
             <div class="flex flex-1 flex-row items-center justify-start">
-              <mat-slider class="flex-1" min="0" max="1" step="0.01" discrete [displayWith]="formatLabel">
+              <mat-slider class="flex-1" min="0" max="100" step="1" discrete [displayWith]="formatLabel">
                 <input matSliderThumb formControlName="threshold">
               </mat-slider>
-              <mat-form-field class="limit-slider-value">
-                <input matInput formControlName="threshold" type="number" step="0.01"
+              <mat-form-field class="limit-slider-value" subscriptSizing="dynamic">
+                <input matInput formControlName="threshold" type="number" step="1"
                        [value]="entitiesLimitTemplateForm.get('triggerConfig.threshold').value"
                        min="0"
-                       max="1"/>
+                       max="100"/>
+                <span class="mr-2" matSuffix>%</span>
               </mat-form-field>
             </div>
           </div>
@@ -591,6 +592,69 @@
         </section>
       </form>
     </mat-step>
+
+    <mat-step *ngIf="ruleNotificationForm.get('triggerType').value === triggerType.RESOURCES_SHORTAGE"
+              [stepControl]="resourceUsageShortageTemplateForm">
+      <ng-template matStepLabel>{{ 'notification.resources-shortage-trigger-settings' | translate }}</ng-template>
+      <form [formGroup]="resourceUsageShortageTemplateForm">
+        <fieldset class="fields-group tb-margin" formGroupName="triggerConfig">
+          <legend translate>notification.filter</legend>
+          <div class="limit-slider-container mb-4 flex flex-row items-center justify-start xs:flex-col xs:items-stretch">
+            <span translate>notification.cpu-threshold</span>
+            <div class="flex flex-1 flex-row items-center justify-start">
+              <mat-slider class="flex-1" min="0" max="100" step="1" discrete [displayWith]="formatLabel">
+                <input matSliderThumb formControlName="cpuThreshold">
+              </mat-slider>
+              <mat-form-field class="limit-slider-value" subscriptSizing="dynamic">
+                <input matInput formControlName="cpuThreshold" type="number" step="1"
+                       [value]="resourceUsageShortageTemplateForm.get('triggerConfig.cpuThreshold').value"
+                       min="0"
+                       max="100"/>
+                <span class="mr-2" matSuffix>%</span>
+              </mat-form-field>
+            </div>
+          </div>
+          <div class="limit-slider-container mb-4 flex flex-row items-center justify-start xs:flex-col xs:items-stretch">
+            <span translate>notification.ram-threshold</span>
+            <div class="flex flex-1 flex-row items-center justify-start">
+              <mat-slider class="flex-1" min="0" max="100" step="1" discrete [displayWith]="formatLabel">
+                <input matSliderThumb formControlName="ramThreshold">
+              </mat-slider>
+              <mat-form-field class="limit-slider-value" subscriptSizing="dynamic">
+                <input matInput formControlName="ramThreshold" type="number" step="1"
+                       [value]="resourceUsageShortageTemplateForm.get('triggerConfig.ramThreshold').value"
+                       min="0"
+                       max="100"/>
+                <span class="mr-2" matSuffix>%</span>
+              </mat-form-field>
+            </div>
+          </div>
+          <div class="limit-slider-container mb-4 flex flex-row items-center justify-start xs:flex-col xs:items-stretch">
+            <span translate>notification.storage-threshold</span>
+            <div class="flex flex-1 flex-row items-center justify-start">
+              <mat-slider class="flex-1" min="0" max="100" step="1" discrete [displayWith]="formatLabel">
+                <input matSliderThumb formControlName="storageThreshold">
+              </mat-slider>
+              <mat-form-field class="limit-slider-value" subscriptSizing="dynamic">
+                <input matInput formControlName="storageThreshold" type="number" step="1"
+                       [value]="resourceUsageShortageTemplateForm.get('triggerConfig.storageThreshold').value"
+                       min="0"
+                       max="100"/>
+                <span class="mr-2" matSuffix>%</span>
+              </mat-form-field>
+            </div>
+          </div>
+        </fieldset>
+      </form>
+      <form [formGroup]="ruleNotificationForm">
+        <section formGroupName="additionalConfig">
+          <mat-form-field class="mat-block">
+            <mat-label translate>notification.description</mat-label>
+            <input matInput formControlName="description">
+          </mat-form-field>
+        </section>
+      </form>
+    </mat-step>
   </mat-horizontal-stepper>
 </div>
 <mat-divider></mat-divider>

ui-ngx/src/app/modules/home/pages/notification/rule/rule-notification-dialog.component.scss

@@ -81,7 +81,7 @@
       min-width: 364px;
     }
     .limit-slider-container {
-      > label {
+      > span {
         margin-right: 16px;
         width: min-content;
         max-width: 40%;

ui-ngx/src/app/modules/home/pages/notification/rule/rule-notification-dialog.component.ts

@@ -102,6 +102,7 @@ export class RuleNotificationDialogComponent extends
   edgeCommunicationFailureTemplateForm: FormGroup;
   edgeConnectionTemplateForm: FormGroup;
   taskProcessingFailureTemplateForm: FormGroup;
+  resourceUsageShortageTemplateForm: FormGroup;
 
   triggerType = TriggerType;
   triggerTypes: TriggerType[];
@@ -315,7 +316,7 @@ export class RuleNotificationDialogComponent extends
     this.entitiesLimitTemplateForm = this.fb.group({
       triggerConfig: this.fb.group({
         entityTypes: [],
-        threshold: [.8, [Validators.min(0), Validators.max(1)]]
+        threshold: [80, [Validators.min(0), Validators.max(100)]]
       })
     });
 
@@ -344,6 +345,14 @@ export class RuleNotificationDialogComponent extends
       })
     });
 
+    this.resourceUsageShortageTemplateForm = this.fb.group({
+      triggerConfig: this.fb.group({
+        cpuThreshold: [80, [Validators.min(0), Validators.max(100)]],
+        ramThreshold: [80, [Validators.min(0), Validators.max(100)]],
+        storageThreshold: [80, [Validators.min(0), Validators.max(100)]]
+      })
+    });
+
     this.triggerTypeFormsMap = new Map<TriggerType, FormGroup>([
       [TriggerType.ALARM, this.alarmTemplateForm],
       [TriggerType.ALARM_COMMENT, this.alarmCommentTemplateForm],
@@ -357,7 +366,8 @@ export class RuleNotificationDialogComponent extends
       [TriggerType.RATE_LIMITS, this.rateLimitsTemplateForm],
       [TriggerType.EDGE_COMMUNICATION_FAILURE, this.edgeCommunicationFailureTemplateForm],
       [TriggerType.EDGE_CONNECTION, this.edgeConnectionTemplateForm],
-      [TriggerType.TASK_PROCESSING_FAILURE, this.taskProcessingFailureTemplateForm]
+      [TriggerType.TASK_PROCESSING_FAILURE, this.taskProcessingFailureTemplateForm],
+      [TriggerType.RESOURCES_SHORTAGE, this.resourceUsageShortageTemplateForm]
     ]);
 
     if (data.isAdd || data.isCopy) {
@@ -380,6 +390,14 @@ export class RuleNotificationDialogComponent extends
         this.deviceInactivityTemplateForm.get('triggerConfig.filterByDevice')
           .patchValue(!!this.ruleNotification.triggerConfig.devices, {onlySelf: true});
       }
+      if (this.ruleNotification.triggerType === TriggerType.ENTITIES_LIMIT) {
+        this.entitiesLimitTemplateForm.get('triggerConfig.threshold').patchValue(this.ruleNotification.triggerConfig.threshold * 100, {emitEvent: false});
+      }
+      if (this.ruleNotification.triggerType === TriggerType.RESOURCES_SHORTAGE) {
+        this.resourceUsageShortageTemplateForm.get('triggerConfig.cpuThreshold').patchValue(this.ruleNotification.triggerConfig.cpuThreshold * 100, {emitEvent: false});
+        this.resourceUsageShortageTemplateForm.get('triggerConfig.ramThreshold').patchValue(this.ruleNotification.triggerConfig.ramThreshold * 100, {emitEvent: false});
+        this.resourceUsageShortageTemplateForm.get('triggerConfig.storageThreshold').patchValue(this.ruleNotification.triggerConfig.storageThreshold * 100, {emitEvent: false});
+      }
     }
   }
 
@@ -428,6 +446,14 @@ export class RuleNotificationDialogComponent extends
       if (triggerType === TriggerType.DEVICE_ACTIVITY) {
         delete formValue.triggerConfig.filterByDevice;
       }
+      if (triggerType === TriggerType.ENTITIES_LIMIT) {
+        formValue.triggerConfig.threshold = formValue.triggerConfig.threshold / 100;
+      }
+      if (triggerType === TriggerType.RESOURCES_SHORTAGE) {
+        formValue.triggerConfig.cpuThreshold = formValue.triggerConfig.cpuThreshold / 100;
+        formValue.triggerConfig.ramThreshold = formValue.triggerConfig.ramThreshold / 100;
+        formValue.triggerConfig.storageThreshold = formValue.triggerConfig.storageThreshold / 100;
+      }
       formValue.recipientsConfig.triggerType = triggerType;
       formValue.triggerConfig.triggerType = triggerType;
       if (this.ruleNotification && !this.data.isCopy) {
@@ -483,8 +509,7 @@ export class RuleNotificationDialogComponent extends
   }
 
   formatLabel(value: number): string {
-    const formatValue = (value * 100).toFixed();
-    return `${formatValue}%`;
+    return `${value}%`;
   }
 
   private isSysAdmin(): boolean {
@@ -497,7 +522,8 @@ export class RuleNotificationDialogComponent extends
       TriggerType.API_USAGE_LIMIT,
       TriggerType.NEW_PLATFORM_VERSION,
       TriggerType.RATE_LIMITS,
-      TriggerType.TASK_PROCESSING_FAILURE
+      TriggerType.TASK_PROCESSING_FAILURE,
+      TriggerType.RESOURCES_SHORTAGE
     ]);
 
     if (this.isSysAdmin()) {

ui-ngx/src/app/modules/home/pages/notification/template/template-notification-dialog.component.ts

@@ -180,7 +180,8 @@ export class TemplateNotificationDialogComponent
       NotificationType.API_USAGE_LIMIT,
       NotificationType.NEW_PLATFORM_VERSION,
       NotificationType.RATE_LIMITS,
-      NotificationType.TASK_PROCESSING_FAILURE
+      NotificationType.TASK_PROCESSING_FAILURE,
+      NotificationType.RESOURCES_SHORTAGE
     ]);
 
     if (this.isSysAdmin()) {

ui-ngx/src/app/shared/models/notification.models.ts

@@ -129,7 +129,7 @@ export interface NotificationRule extends Omit<BaseData<NotificationRuleId>, 'la
 export type NotificationRuleTriggerConfig = Partial<AlarmNotificationRuleTriggerConfig & DeviceInactivityNotificationRuleTriggerConfig &
   EntityActionNotificationRuleTriggerConfig & AlarmCommentNotificationRuleTriggerConfig & AlarmAssignmentNotificationRuleTriggerConfig &
   RuleEngineLifecycleEventNotificationRuleTriggerConfig & EntitiesLimitNotificationRuleTriggerConfig &
-  ApiUsageLimitNotificationRuleTriggerConfig & RateLimitsNotificationRuleTriggerConfig>;
+  ApiUsageLimitNotificationRuleTriggerConfig & RateLimitsNotificationRuleTriggerConfig & ResourceUsageShortageNotificationRuleTriggerConfig>;
 
 export interface AlarmNotificationRuleTriggerConfig {
   alarmTypes?: Array<string>;
@@ -183,6 +183,12 @@ export interface EntitiesLimitNotificationRuleTriggerConfig {
   threshold: number;
 }
 
+export interface ResourceUsageShortageNotificationRuleTriggerConfig {
+  cpuThreshold: number;
+  ramThreshold: number;
+  storageThreshold: number;
+}
+
 export interface ApiUsageLimitNotificationRuleTriggerConfig {
   apiFeatures: ApiFeature[];
   notifyOn: ApiUsageStateValue[];
@@ -526,7 +532,8 @@ export enum NotificationType {
   RATE_LIMITS = 'RATE_LIMITS',
   EDGE_CONNECTION = 'EDGE_CONNECTION',
   EDGE_COMMUNICATION_FAILURE = 'EDGE_COMMUNICATION_FAILURE',
-  TASK_PROCESSING_FAILURE = 'TASK_PROCESSING_FAILURE'
+  TASK_PROCESSING_FAILURE = 'TASK_PROCESSING_FAILURE',
+  RESOURCES_SHORTAGE = 'RESOURCES_SHORTAGE'
 }
 
 export const NotificationTypeIcons = new Map<NotificationType, string | null>([
@@ -538,7 +545,8 @@ export const NotificationTypeIcons = new Map<NotificationType, string | null>([
   [NotificationType.RULE_ENGINE_COMPONENT_LIFECYCLE_EVENT, 'settings_ethernet'],
   [NotificationType.ENTITIES_LIMIT, 'data_thresholding'],
   [NotificationType.API_USAGE_LIMIT, 'insert_chart'],
-  [NotificationType.TASK_PROCESSING_FAILURE, 'warning']
+  [NotificationType.TASK_PROCESSING_FAILURE, 'warning'],
+  [NotificationType.RESOURCES_SHORTAGE, 'warning']
 ]);
 
 export const AlarmSeverityNotificationColors = new Map<AlarmSeverity, string>(
@@ -657,6 +665,12 @@ export const NotificationTemplateTypeTranslateMap = new Map<NotificationType, No
       helpId: 'notification/task_processing_failure'
     }
   ],
+  [NotificationType.RESOURCES_SHORTAGE,
+    {
+      name: 'notification.template-type.resources-shortage',
+      helpId: 'notification/resources_shortage'
+    }
+  ]
 ]);
 
 export enum TriggerType {
@@ -673,6 +687,7 @@ export enum TriggerType {
   EDGE_CONNECTION = 'EDGE_CONNECTION',
   EDGE_COMMUNICATION_FAILURE = 'EDGE_COMMUNICATION_FAILURE',
   TASK_PROCESSING_FAILURE = 'TASK_PROCESSING_FAILURE',
+  RESOURCES_SHORTAGE = 'RESOURCES_SHORTAGE'
 }
 
 export const TriggerTypeTranslationMap = new Map<TriggerType, string>([
@@ -688,7 +703,8 @@ export const TriggerTypeTranslationMap = new Map<TriggerType, string>([
   [TriggerType.RATE_LIMITS, 'notification.trigger.rate-limits'],
   [TriggerType.EDGE_CONNECTION, 'notification.trigger.edge-connection'],
   [TriggerType.EDGE_COMMUNICATION_FAILURE, 'notification.trigger.edge-communication-failure'],
-  [TriggerType.TASK_PROCESSING_FAILURE, 'notification.trigger.task-processing-failure']
+  [TriggerType.TASK_PROCESSING_FAILURE, 'notification.trigger.task-processing-failure'],
+  [TriggerType.RESOURCES_SHORTAGE, 'notification.trigger.resources-shortage']
 ]);
 
 export interface NotificationUserSettings {

ui-ngx/src/assets/help/en_US/notification/resources_shortage.md

@@ -0,0 +1,41 @@
+#### Resources shortage notification templatization
+
+<div class="divider"></div>
+<br/>
+
+Notification subject and message fields support templatization.
+The list of available templatization parameters depends on the template type.
+See the available types and parameters below:
+
+Available template parameters:
+
+* `resource` - the resource name;
+* `usage` - the resource usage value;
+
+Parameter names must be wrapped using `${...}`. For example: `${resource}`.
+You may also modify the value of the parameter with one of the suffixes:
+
+* `upperCase`, for example - `${resource:upperCase}`
+* `lowerCase`, for example - `${resource:lowerCase}`
+* `capitalize`, for example - `${resource:capitalize}`
+
+<div class="divider"></div>
+
+##### Examples
+
+Let's assume there is a resource usage shortage and the system is low on free resources (CPU, RAM, or Storage).
+The following template:
+
+```text
+Warning: ${resource} is critically high at ${usage}%
+{:copy-code}
+```
+
+will be transformed to:
+
+```text
+Warning: CPU is critically high at 83%
+```
+
+<br>
+<br>

ui-ngx/src/assets/locale/locale.constant-en_US.json

@@ -3876,6 +3876,7 @@
         "new-platform-version-trigger-settings": "New platform version trigger settings",
         "rate-limits-trigger-settings": "Exceeded rate limits trigger settings",
         "task-processing-failure-trigger-settings": "Task processing failure trigger settings",
+        "resources-shortage-trigger-settings": "Resources shortage trigger settings",
         "at-least-one-should-be-selected": "At least one should be selected",
         "basic-settings": "Basic settings",
         "button-text": "Button text",
@@ -3890,6 +3891,7 @@
         "create-new": "Create new",
         "created": "Created",
         "customize-messages": "Customize messages",
+        "cpu-threshold": "CPU threshold",
         "delete-notification-text": "Be careful, after the confirmation the notification will become unrecoverable.",
         "delete-notification-title": "Are you sure you want to delete the notification?",
         "delete-notifications-text": "Be careful, after the confirmation notifications will become unrecoverable.",
@@ -4005,6 +4007,7 @@
         "only-rule-chain-lifecycle-failures": "Only rule chain lifecycle failures",
         "only-rule-node-lifecycle-failures": "Only rule node lifecycle failures",
         "platform-users": "Platform users",
+        "ram-threshold": "RAM threshold",
         "rate-limits": "Rate limits",
         "rate-limits-hint": "If the field is empty, the trigger will be applied to all rate limits",
         "recipient": "Recipient",
@@ -4070,6 +4073,7 @@
         "start-from-scratch": "Start from scratch",
         "status": "Status",
         "stop-escalation-alarm-status-become": "Stop the escalation on the alarm status become:",
+        "storage-threshold": "Storage threshold",
         "subject": "Subject",
         "subject-required": "Subject is required",
         "subject-max-length": "Subject should be less than or equal to {{ length }} characters",
@@ -4091,7 +4095,8 @@
             "rate-limits": "Exceeded rate limits",
             "edge-communication-failure": "Edge communication failure",
             "edge-connection": "Edge connection",
-            "task-processing-failure": "Task processing failure"
+            "task-processing-failure": "Task processing failure",
+            "resources-shortage": "Resources shortage"
         },
         "templates": "Templates",
         "notification-templates": "Notifications / Templates",
@@ -4115,6 +4120,7 @@
             "edge-connection": "Edge connection",
             "edge-communication-failure": "Edge communication failure",
             "task-processing-failure": "Task processing failure",
+            "resources-shortage": "Resources shortage",
             "trigger": "Trigger",
             "trigger-required": "Trigger is required"
         },