This topic describes the limits of the alerting feature in Log Service.
|Monitoring and alerting||Number of alert monitoring rules||You can create up to 100 alert monitoring rules in each project.
If you want to increase the quota, you can submit a ticket. The quota can be increased to 200 in each project.
|Query statements||For more information about the limits on query statements, see Query and analysis.|
|Results of a single query statement||If more than 1,000 rows are returned for a single query statement, only the first
1,000 rows are used for a set operation.
If you specify three query statements but do not select No Merge, only the first 100 rows that are returned for each query are used for set operations.
|Number of query statements for set operations||You can specify one to three query statements for set operations.|
|Field value length||If the length of a field value exceeds 1,024 characters, the field value is truncated, and only the first 1,024 characters are used for analysis.|
|Time range for a query statement||The time range for a query statement cannot exceed 24 hours.|
|Alert management||Regions in which incident management is supported||Incident management is supported in the following regions:
|Number of incidents||Up to 1,000 incidents can be retained in 30 days. If the number of incidents exceeds 1,000, the earliest incident is automatically overwritten by the latest incident.|
|Number of incident comments||Up to 10 comments can be added for each incident. If the number of comments for an incident exceeds 10, the earliest comment is automatically overwritten by the latest comment.|
|Notification management||Notification methods||
For more information, see Notification methods.
|Alert template variables||The value of a variable cannot exceed 2 KB in size. If a value exceeds 2 KB in size, the value is truncated.|
|Notification quota||A recipient can receive up to 9,999 emails, text messages, or phone calls per day. For more information, see Configure notification quotas.|
|Associated query statements||You can associate an alert rule with a maximum of three query statements.|
|Field value size||If a field value exceeds 1,024 characters in length, Log Service extracts only the first 1,024 characters for data processing.|
|Trigger condition||The trigger condition has the following limits:
|Query time range||The maximum time range that you can specify for each query is 24 hours.|
|Voice calls||If a voice call is not answered, Log Service sends an SMS notification.
You are charged only once for the voice call regardless of whether the call is answered. The SMS notification does not incur fees.