You can create a log monitoring metric and create an alert rule for the metric. You can also modify and delete a metric.
Prerequisites
A project and a Logstore are created in Simple Log Service.
For more information, see Getting Started.
CloudMonitor is granted the permissions to access Simple Log Service.
For more information, see Authorize CloudMonitor to access Simple Log Service.
Create a log monitoring metric
CloudMonitor has discontinued the log monitoring, custom monitoring, and custom event monitoring features since September 13, 2022. Users who enabled the preceding features before September 13, 2022 can still use them until September 13, 2024. If you have not enabled these features, we recommend that you use the business monitoring feature of Hybrid Cloud Monitoring to monitor on-premises logs, Simple Log Service logs, and custom data with more flexibility and lower costs. For more information, see Manage metric import tasks for on-premises logs, Manage metrics for logs imported from Simple Log Service, and Report custom monitoring data.
Log on to the CloudMonitor console.
In the left-side navigation pane, choose .
On the Log Monitoring page, click Create Log Monitoring Metric.
In the Associate Resource step, configure the parameters and click Next. The following table describes the parameters.
Parameter
Description
Region
The region in which the Simple Log Service project resides.
Project
The name of the Simple Log Service project.
Logstore
The name of the Simple Log Service Logstore.
In the Define Metric step, configure the parameters and click Next. The following table describes the parameters.
Parameter
Description
Metric Name
The name of the metric.
Unit
The unit of the metric.
Computing Cycle
The statistical period of the metric. Unit: minutes. Valid values: 1, 2, 3, 4, 5, 10, 15, 20, 30, and 60.
Statistical Method
The function that is used to aggregate log data within a statistical period. If the value of the specified field is a numeric value, you can use all statistical methods. Otherwise, you can use only the Count and countps methods to aggregate log data. Valid values:
Count: calculates the number of values of the specified field within a statistical period.
Sum: calculates the sum of the values of the specified field within the last minute.
Max: calculates the maximum value of the specified field within a statistical period.
Min: calculates the minimum value of the specified field within a statistical period.
Average: calculates the average of the values of the specified field within a statistical period.
countps: calculates the number of values of the specified field divided by the total number of seconds within a statistical period.
sumps: calculates the sum of the values of the specified field divided by the total number of seconds within a statistical period.
distinct: calculates the number of unique values of the specified field within a statistical period.
Extended Field
Performs basic operations on calculation results. For example, after you set the Statistical Method parameter to aggregate log data, you specify a field as TotalNumber to calculate the total number of HTTP requests. At the same time, you specify another field as 5xxNumber to calculate the number of HTTP requests whose status code is greater than 499. In this case, you can specify an extended field to calculate the server error rate by using the following formula: 5XXNumber/TotalNumber × 100%.
Log Filter
Filters log data. This parameter is equivalent to the WHERE clause in SQL. For example, if you want to monitor logs in which the value of the level field is ERROR, set the parameter to
level>=ERROR.The name of the log field that you use to filter data cannot contain Chinese characters.
Group-By
The dimension based on which data is aggregated. This parameter is equivalent to the GROUP BY clause in SQL.
Log data is grouped by the specified dimension. If you do not specify a dimension, all data is aggregated based on the specified aggregate function.
For more information, see GROUP BY clause.
Select SQL
Converts the statistical methods that you specify to an SQL statement. This parameter indicates how data is processed.
Application Groups
The name of the application group. The metric is added to the specified application group.
In the Configure Alert Rule step, configure the parameters and click Next. The following table describes the parameters.
Parameter
Description
Alert Rule
The name of the alert rule.
Rule Description
The condition that triggers an alert. If the metric meets the specified condition, an alert is triggered.
Alert Level
The alert notification method. Valid value:
Email + Webhook
Triggered when threshold is exceeded for
The number of consecutive times that the threshold value is exceeded. If the number of times exceeds the limit that you specify, the alert contacts in the alert contact groups receive alert notifications. Valid values: 1, 3, 5, 10, 15, 30, 60, 90, 120, and 180.
Mute For
The interval at which CloudMonitor resends alert notifications before the alert is cleared. Valid values: 5 Minutes, 15 Minutes, 30 Minutes, 60 Minutes, 3 Hours, 6 Hours, 12 Hours, and 24 Hours.
If the threshold value is exceeded, CloudMonitor sends an alert notification. If the threshold value is exceeded again within the mute period, CloudMonitor does not resend an alert notification. If the alert is not cleared after the mute period ends, CloudMonitor resends an alert notification.
Effective Period
The period during which the alert rule is effective. CloudMonitor monitors the metric based on the alert rule only within the specified period.
Alert Callback
The callback URL that can be accessed over the Internet. CloudMonitor sends a POST or GET request to push an alert notification to the callback URL that you specify. Only HTTP requests are supported. For information about how to configure alert callbacks, see Use the alert callback feature to send notifications about threshold-triggered alerts.
In the Creation Result step, click Close.
Modify a log monitoring metric
Log on to the CloudMonitor console.
In the left-side navigation pane, choose .
On the Log Monitoring page, find the metric that you want to modify and click Edit in the Actions column.
In the Associate Resource step, configure the parameters and click Next. The following table describes the parameters.
Parameter
Description
Region
The region in which the Simple Log Service project resides.
Project
The name of the Simple Log Service project.
Logstore
The name of the Simple Log Service Logstore.
In the Define Metric step, configure the parameters and click Next. The following table describes the parameters.
Parameter
Description
Unit
The unit of the metric.
Computing Cycle
The statistical period of the metric. Unit: minutes. Valid values: 1, 2, 3, 4, 5, 10, 15, 20, 30, and 60.
Statistical Method
The function that is used to aggregate log data within a statistical period. If the value of the specified field is a numeric value, you can use all statistical methods. Otherwise, you can use only the Count and countps methods to aggregate log data. Valid values:
Count: calculates the number of values of the specified field within a statistical period.
Sum: calculates the sum of the values of the specified field within the last minute.
Max: calculates the maximum value of the specified field within a statistical period.
Min: calculates the minimum value of the specified field within a statistical period.
Average: calculates the average of the values of the specified field within a statistical period.
countps: calculates the number of values of the specified field divided by the total number of seconds within a statistical period.
sumps: calculates the sum of the values of the specified field divided by the total number of seconds within a statistical period.
distinct: calculates the number of unique values of the specified field within a statistical period.
Extended Field
Performs basic operations on calculation results. For example, after you set the Statistical Method parameter to aggregate log data, you specify a field as TotalNumber to calculate the total number of HTTP requests. At the same time, you specify another field as 5xxNumber to calculate the number of HTTP requests whose status code is greater than 499. In this case, you can specify an extended field to calculate the server error rate by using the following formula: 5XXNumber/TotalNumber × 100%.
Log Filter
Filters log data. This parameter is equivalent to the WHERE clause in SQL. For example, if you want to monitor logs in which the value of the level field is ERROR, set the parameter to
level>=ERROR.The name of the log field that you use to filter data cannot contain Chinese characters.
Group-By
The dimension based on which data is aggregated. This parameter is equivalent to the GROUP BY clause in SQL.
Log data is grouped by the specified dimension. If you do not specify a dimension, all data is aggregated based on the specified aggregate function.
For more information, see GROUP BY clause.
Select SQL
Converts the statistical methods that you specify to an SQL statement. This parameter indicates how data is processed.
Application Groups
The name of the application group. The metric is added to the specified application group.
In the Configure Alert Rule step, configure the parameters and click Next. The following table describes the parameters.
Parameter
Description
Alert Rule
The name of the alert rule.
Rule Description
The condition that triggers an alert. If the metric meets the specified condition, an alert is triggered.
Alert Level
The alert notification method. Valid value:
Email + Webhook
Triggered when threshold is exceeded for
The number of consecutive times that the threshold value is exceeded. If the number of times exceeds the limit that you specify, the alert contacts in the alert contact groups receive alert notifications. Valid values: 1, 3, 5, 10, 15, 30, 60, 90, 120, and 180.
Mute For
The interval at which CloudMonitor resends alert notifications before the alert is cleared. Valid values: 5 Minutes, 15 Minutes, 30 Minutes, 60 Minutes, 3 Hours, 6 Hours, 12 Hours, and 24 Hours.
If the threshold value is exceeded, CloudMonitor sends an alert notification. If the threshold value is exceeded again within the mute period, CloudMonitor does not resend an alert notification. If the alert is not cleared after the mute period ends, CloudMonitor resends an alert notification.
Effective Period
The period during which the alert rule is effective. CloudMonitor monitors the metric based on the alert rule only within the specified period.
Alert Callback
The callback URL that can be accessed over the Internet. CloudMonitor sends a POST or GET request to push an alert notification to the callback URL that you specify. Only HTTP requests are supported. For information about how to configure alert callbacks, see Use the alert callback feature to send notifications about threshold-triggered alerts.
In the Creation Result step, click Close.
Delete one or more log monitoring metrics
Log on to the CloudMonitor console.
In the left-side navigation pane, choose .
Delete one or more metrics.
Delete a single metric
Find the metric that you want to delete, click the
icon in the Actions column, and then click Delete. In the Confirm Delete message, click Confirm.
Delete multiple metrics at a time
Select the metrics that you want to delete and click Delete in the lower-left corner of the page.
In the Confirm Delete message, click Confirm.