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TencentDB for MongoDB
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    Configuring Event Alarms

    Last updated: 2024-05-07 12:37:13
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      Overview

      TencentDB for MongoDB has been integrated with Tencent Cloud Observability Platform, supporting the reporting of Tencent Cloud Observability Platform events. All Tencent Cloud Observability Platform events will be automatically delivered to Tencent Cloud's EventBridge in the Cloud Service Event Bus. Tencent Cloud Event Bridge (EventBridge) is a secure, stable, and efficient serverless event management platform. An event is a data record of a status change. Releasing an event from the event source to EventBridge needs to comply with CloudEvents specifications. For more information about the specifications, see CloudEvents 1.0.

      Event Target

      An event rule can have multiple event targets. Before creating an event rule, first plan the event target types. Event Bridge currently supports the following event targets:
      Message Push (only supports rules in the cloud service event bus)
      CLS Log
      Serverless Cloud Function (SCF)
      Ckafka

      TencentDB for MongoDB Event

      Event Chinese Name
      Event English Name
      Event Type
      Subordinate Dimension
      Recovery Concept Availability
      Event Description
      Solution and Suggestion
      Insufficient Backup Oplog
      oplogInsufficient
      Exception event
      Instance dimension
      No
      During the backup process of TencentDB for MongoDB, it is impossible to read the complete oplog from the last backup to the current backup, which will affect your ability to rollback the database to any point within 7 days.
      It is recommended to adjust the capacity size of the TencentDB for MongoDB oplog or the frequency of backups in the MongoDB console. For specific operations, see Adjust Oplog Storage Capacity.
      Number of Connections Exceeding Limit
      connectionOverlimit
      Exception event
      Instance dimension
      Yes
      Number of instance connections exceeds the maximum limit.
      Increase the maximum number of connections or restart the instance. For specific operations, see Solutions for Exceeded Connection Limit.
      For database performance optimization, see Analysis and Resolution Methods for Abnormal High Connection Usage.
      Primary-Replica Switch
      primarywitch
      Exception event
      Instance dimension
      Yes
      Instance primary node is abnormal, and switching with the secondary node occurs. This event may be triggered in case of physical server failure.
      Confirm whether the instance status is normal.
      Disk Space About to Run out
      instanceDiskSpaceLow
      Exception event
      Instance dimension
      Yes
      The disk space is about to be filled, which may cause the instance to become read-only.
      Clean up disk space. For specific operations, see Solutions for High Disk Space Usage.
      Instance Rollback
      instanceRollback
      Exception event
      Instance dimension
      Yes
      Instance data rollback. When some data on the primary node has not been timely synchronized to the secondary node, failure of the primary node concurrency leads to primary-replica switch, which may trigger this event.
      Confirm whether the instance status is normal.
      Node CPU Exception
      NodeCPUAbnormal
      Exception event
      Instance dimension
      Yes
      If any node in the cluster reaches 80% CPU usage, an alarm is immediately triggered.
      For specific operations, see Solutions for High CPU Usage.

      Billing Overview

      Tencent Cloud offers EventBridge as a pay-as-you-go service. For more information, see EventBridge > Product Pricing.
      Type
      Pay-as-You-Go
      Payment Method
      Settlement is based on the number of events actually delivered to the event bus, calculated hourly.
      Billing Unit
      CNY/Million Events
      Usage Scenario
      For applications with low or high fluctuating message volumes, it can effectively avoid resource waste.

      Directions

      1. Log in to the EventBridge console. In the left sidebar, choose Event Rule.
      2. At the top of the page on the right, under the Region, select Guangzhou, then select Event Set from the dropdown list and select default .
      Note:
      The cloud service event bus collects Monitor and Audit events generated by Tencent Cloud services across all regions. It is created by default in Guangzhou and cannot be deleted.
      In the left sidebar, choose Event Set. In the Event Set list, click Default to view the default event bus which already includes TencentDB for MongoDB. For specific operations, see Tencent Cloud Service Event Source.
      3. On the Event Rule page, click Create. On the Event Pattern navigation page, configure the page parameters according to the parameter explanations shown in the following table.
      Interface Area
      Interface Parameter
      Parameter Explanation
      Basic Information
      Region
      The region where the event rule is created.
      Event Bus
      Information about the event bus to which the event rule belongs.
      Rule Name
      Set the name of the event rule. It can only contain letters, numbers, underscores, hyphens, must start with a letter, and end with a number or letter, between 2 and 60 characters.
      Rule Description
      A brief description of the event rule.
      Tag
      Set the tag key and value for the event.
      Data Conversion
      Check if data conversion is needed.
      Event Example
      Event Example Selection
      In the dropdown list, you can search for MongoDB and view the relevant examples of MongoDB events.
      Event Matching
      Writing Pattern
      Form Pattern: This pattern allows you to select cloud service type and event type, providing event matching rules.
      Custom Event: Define event matching rules in the input box below. For rule writing instructions, click Rule Writing Guidelines.
      Cloud Service Type
      When Writing Pattern is set to Form Pattern, this parameter is shown. In the dropdown list, select TencentDB for MongoDB.
      Event Type
      When Writing Pattern is set to Form Pattern, this parameter is displayed. In the dropdown list, select the supported event types.
      Event Matching Rule Preview
      Preview the generated event matching rules.
      4. click Test Matching Rules to test the defined event matching rules. After passing the test, click Next. If the test fails, correct it according to the prompt information.
      5. (Optional) If you need to convert the data format, the Event Transformation page is displayed as shown in the following figure. Configure the format and fields for data transformation according to the parameter explanations in the table below.
      Note:
      Data conversion offers a simple data processing feature. By the input data and configured items, it can carry out data formatting, return the processed structured data, distribute to downstream targets, and create a bridge between data sources and data processing systems.
      
      Interface Area
      Interface Parameter
      Parameter Explanation
      Create New Data Conversion
      Event Pattern Preview
      By selecting Sample Event, you can use the event template;
      By selecting Manually Input, you can define the event fields in the input box below.
      Event Template
      For Event Pattern Preview, select Sample Event to display the parameter. In the dropdown list, you can search for MongoDB and select a template for MongoDB events. In the input box below, the specific field information of the event template will be displayed.
      Conversion Target
      Complete Event: Routes the complete structure of event fields to the event target.
      Partial Event: Event Bridge uses JSONPath configuration to extract event fields and routes the specified event fields to the event target.
      JSONPath
      When you select partial events for the conversion target, this parameter is displayed. Enter the event fields you wish to convert in the input box.
      Parsing Mode
      Select a parsing mode. Supports JSON, separators, and regular expression extraction.
      Parsing Result
      Click Confirm after the parsing mode to start parsing data, converting event rules into a Key-Value format.
      Filter
      Configure the filter to only output data that meets the filter rules.
      Data Processing
      For the current parsed data, select the data type in the TYPE column.
      Test Results
      Click Testing to perform a validity check and output the final conversion result.
      Failure Information Handling
      Dead Letter Queue
      Configure whether to deliver messages that fail to be processed properly to CKafka's dead letter queue.
      Delivery Type
      The delivery type for failed messages is set to CKafka.
      CKafka Instance
      Select the instance ID of the CKafka instance to which failed messages will be delivered.
      CKafka Topic
      Choose the topic within the selected CKafka instance to which failed messages will be delivered. CKafka uses the concept of topics externally. Producers write messages to a topic, and consumers read them from it.
      6. Click Confirm after the parsing mode to begin data parsing. Wait until the completion of data parsing. Set filter rules and data processing methods. For specific operations, see Configuring Data Conversion.
      7. Click Next to select the event target bound to this rule. You can deliver the collected events to the specified delivery target for completing processing and consuming. The following figure takes the Trigger Method as Message Push as an example. To configure event alarm push, see Configuring Push Target.
      
      8. To immediately activate the event rule, check Enable Event Rule Immediately, and click Complete.

      Event Rule Related Interface

      Interface Name
      Interface Feature
      Validation Rules
      Create Event Rule
      Delete Event Rule
      Retrieve Event Rule Details
      Retrieve Event Rule List
      Update Event Rules
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