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Creates or updates an alarm and associates it with the specified metric, metric math expression, anomaly detection model, or Metrics Insights query. For more information about using a Metrics Insights query for an alarm, see Create alarms on Metrics Insights queries.
Alarms based on anomaly detection models cannot have Auto Scaling actions.
When this operation creates an alarm, the alarm state is immediately set to INSUFFICIENT_DATA.
The alarm is then evaluated and its state is set appropriately. Any actions associated
with the new state are then executed.
When you update an existing alarm, its state is left unchanged, but the update completely overwrites the previous configuration of the alarm.
If you are an IAM user, you must have Amazon EC2 permissions for some alarm operations:
The iam:CreateServiceLinkedRole permission for all alarms with EC2 actions
The iam:CreateServiceLinkedRole permissions to create an alarm with Systems
Manager OpsItem or response plan actions.
The first time you create an alarm in the Amazon Web Services Management Console,
the CLI, or by using the PutMetricAlarm API, CloudWatch creates the necessary service-linked
role for you. The service-linked roles are called AWSServiceRoleForCloudWatchEvents
and AWSServiceRoleForCloudWatchAlarms_ActionSSM. For more information, see
Amazon
Web Services service-linked role.
Each PutMetricAlarm action has a maximum uncompressed payload of 120 KB.
Cross-account alarms
You can set an alarm on metrics in the current account, or in another account. To create a cross-account alarm that watches a metric in a different account, you must have completed the following pre-requisites:
The account where the metrics are located (the sharing account) must already have a sharing role named CloudWatch-CrossAccountSharingRole. If it does not already have this role, you must create it using the instructions in Set up a sharing account in Cross-account cross-Region CloudWatch console. The policy for that role must grant access to the ID of the account where you are creating the alarm.
The account where you are creating the alarm (the monitoring account) must already have a service-linked role named AWSServiceRoleForCloudWatchCrossAccount to allow CloudWatch to assume the sharing role in the sharing account. If it does not, you must create it following the directions in Set up a monitoring account in Cross-account cross-Region CloudWatch console.
This is an asynchronous operation using the standard naming convention for .NET 4.5 or higher. For .NET 3.5 the operation is implemented as a pair of methods using the standard naming convention of BeginPutMetricAlarm and EndPutMetricAlarm.
Namespace: Amazon.CloudWatch
Assembly: AWSSDK.CloudWatch.dll
Version: 3.x.y.z
public abstract Task<PutMetricAlarmResponse> PutMetricAlarmAsync( PutMetricAlarmRequest request, CancellationToken cancellationToken )
Container for the necessary parameters to execute the PutMetricAlarm service method.
A cancellation token that can be used by other objects or threads to receive notice of cancellation.
| Exception | Condition |
|---|---|
| LimitExceededException | The quota for alarms for this customer has already been reached. |
.NET Core App:
Supported in: 3.1
.NET Standard:
Supported in: 2.0
.NET Framework:
Supported in: 4.5